How Long Do Roasted Coffee Beans Last

Roasted coffee beans stay fresh for 2-4 weeks after roasting, but proper storage can extend this to 2-3 months. Oxygen, light, heat, and moisture are the main enemies of freshness, causing flavor loss and staleness. Freezing is the best long-term solution for preserving quality beyond the typical shelf life.

Have you ever cracked open a bag of coffee beans, expecting that incredible, vibrant aroma, only to be met with something… flat? Maybe it smells faintly of cardboard or just lacks that punchy, enticing fragrance you remember from the first cup. Or worse, you brew a pot and it tastes dull, lifeless, and utterly disappointing. That amazing coffee experience you crave? It’s slipping away faster than you think. The truth is, roasted coffee beans aren’t forever friends. They have a shelf life, and understanding “how long do roasted coffee beans last” is the secret to unlocking consistently delicious coffee in your cup. It’s not just about expiration dates on the bag; it’s about the invisible chemical dance happening inside that container every single day.

Think of your coffee beans as little flavor powerhouses, but ones that start fading the moment they leave the roaster. That beautiful, complex taste you love – the fruity notes, the chocolatey depth, the bright acidity – isn’t static. It’s the result of volatile compounds created during roasting. These compounds are incredibly delicate. They begin escaping (a process called degassing) and reacting with their environment almost immediately. Oxygen is the biggest culprit, slowly oxidizing the oils and compounds, turning vibrant flavors into stale, cardboard-like notes. Light, heat, and moisture join the party as accomplices, speeding up this degradation. Ignoring this reality means you’re probably brewing coffee that’s past its prime, wasting money, and missing out on the full sensory experience your beans promised. Knowing how long roasted coffee beans last isn’t just trivia; it’s the key to transforming your daily ritual from mediocre to magnificent.

Key Takeaways

• Peak freshness window: Enjoy beans within 2-4 weeks of roasting for optimal flavor and aroma.
• Storage is critical: Keep beans in an airtight container, away from light, heat, and moisture to slow staling.
• Signs of staleness: Look for faded color, lack of aroma, flat taste, or visible oiliness (a sign of rancidity).
• Freezing extends life: Properly frozen beans can maintain quality for 3-6 months without significant flavor loss.
• Avoid the fridge: Refrigeration causes condensation and odor absorption, accelerating staleness.
• Grind fresh: Always grind beans just before brewing; pre-ground coffee loses flavor rapidly.
• Buy small batches: Purchase only what you’ll use within 2-3 weeks to ensure maximum freshness.

Quick Answers to Common Questions

Can I still use coffee beans after 2 months?

Beans stored properly at room temperature for 2 months will likely taste significantly stale and flat, lacking vibrant flavors. While safe to drink, the quality will be poor. If frozen correctly from the start, beans can still be enjoyable at 2 months.

Why do my coffee beans taste oily?

Excessive oiliness, especially on lighter roasts, usually indicates the beans are old and the oils have migrated to the surface, often beginning to turn rancid. It’s a sign they’ve passed their peak freshness and may taste stale or sour.

Is it better to store coffee in the fridge?

No, storing coffee in the fridge is generally not recommended. The humidity causes condensation when you remove the container, and beans absorb odors from other foods, accelerating staleness and ruining flavor.

How can I tell if coffee beans are moldy?

Look for visible fuzzy spots (white, green, or black) on the beans. Smell for a distinct musty or earthy odor. If you see or smell mold, discard the entire batch immediately – do not brew it.

Do coffee beans expire?

Coffee beans don’t “expire” like perishable food with a strict safety date. They become stale and lose flavor over time but remain safe to consume for many months if stored properly and free of mold. Quality, not safety, is the main concern.

The Science Behind Coffee Bean Freshness: Why Beans Don’t Last Forever

Understanding why coffee beans lose freshness so quickly requires a peek into the fascinating chemistry happening inside that bag. It all boils down to two main processes: degassing and oxidation. When coffee beans are roasted, intense heat triggers the Maillard reaction and caramelization, creating hundreds of complex flavor and aroma compounds. Crucially, roasting also generates a significant amount of carbon dioxide (CO2) gas trapped within the bean’s cellular structure. This CO2 is vital – it acts like a protective shield, helping to preserve those delicate flavor compounds and pushing them out during brewing, creating that lovely crema in espresso.

The Great CO2 Escape: Degassing

Immediately after roasting, beans are like little CO2 factories. They release gas rapidly for the first few days – you might even hear a faint hissing sound if the bag is sealed! This initial degassing phase is actually beneficial. It prevents the beans from bursting and helps stabilize them. However, this release continues, albeit more slowly, for weeks. As the CO2 escapes, it takes some of those precious volatile aromatic compounds with it. The protective blanket thins. Without sufficient CO2, the beans become more vulnerable to the next major threat: oxygen. The rate of degassing depends heavily on the roast level (darker roasts degas faster initially due to more porous structure) and the bean’s origin, but the process is universal and unstoppable.

Oxidation: The Silent Flavor Killer

While degassing removes the protective CO2, oxidation is the primary chemical reaction that destroys flavor. Oxygen in the air reacts with the lipids (fats/oils) and other organic compounds within the bean. This reaction breaks down the complex molecules responsible for nuanced flavors and aromas, transforming them into simpler, often unpleasant compounds. Think of it like cutting an apple – it starts to brown and taste off when exposed to air. Coffee beans undergo a similar, though more complex, process. Oxidation leads to the characteristic “stale” taste: flat, lifeless, sometimes papery or woody, and lacking the vibrant acidity or sweetness you expect. The oils in the beans can also oxidize and become rancid, adding unpleasant sour or paint-like notes. Light, heat, and moisture dramatically accelerate this oxidation process, making storage conditions absolutely critical in answering “how long do roasted coffee beans last?”

Peak Freshness Window: When Are Roasted Coffee Beans Best?

So, when is that magical moment when your coffee beans are performing at their absolute peak? It’s not the day they’re roasted, and it’s certainly not months later. There’s a specific window where the balance between residual CO2 (for freshness and crema) and the development of complex flavors is just right. This peak freshness period is generally considered to be **between 4 days and 4 weeks after the roast date.**

The First Few Days: Resting is Essential

Contrary to what some might think, coffee beans aren’t ready to brew the moment they cool down from the roaster. The intense heat of roasting leaves the beans in a state of flux. During the first 12-72 hours, they undergo a crucial “resting” or “degassing” phase. This is when the initial, rapid release of CO2 happens. Brewing too soon (within the first 12-24 hours) can result in under-extracted, sour coffee because the escaping gas disrupts the water’s ability to evenly saturate the grounds. The flavors also haven’t fully settled and integrated. Patience pays off here – waiting at least 24-48 hours, and ideally up to 4-7 days for lighter roasts, allows the beans to stabilize, leading to a more balanced, sweeter, and complex cup. This resting period is a key reason why the *very* beginning of the peak window starts around day 4.

The Sweet Spot: Weeks 1-3

For most coffee lovers and professionals, the absolute prime time for enjoying roasted beans is typically **between 7 and 21 days post-roast.** During this period:

• CO2 levels are optimal: Enough gas remains to protect flavors and create good crema during brewing, but not so much that it hinders extraction.
• Flavors are vibrant and complex: The initial harshness from roasting has mellowed, and the full spectrum of origin characteristics (fruity, floral, nutty, chocolatey) and roast-developed notes are shining through clearly.
• Aroma is intense and inviting: Opening the bag releases that powerful, enticing fragrance that signals quality coffee.

This is when you’ll experience the coffee *as the roaster intended*. Lighter roasts might hit their peak slightly earlier (around 7-14 days), while darker roasts, which degas faster, might peak a bit later (10-21 days) but also decline sooner. Paying attention to the roast date on your bag and brewing within this 1-3 week window is the single biggest factor in maximizing flavor.

Beyond the Peak: The Gradual Decline

After the 3-4 week mark, the decline in quality becomes more noticeable, though it’s not an overnight cliff edge. Beans are still *safe* to drink for months (unless moldy), but the vibrant flavors fade. You’ll likely notice:

• A significant reduction in aromatic intensity – the bag smells less exciting.
• A flatter, less complex taste profile – nuanced notes disappear, leaving a more generic “coffee” flavor.
• Reduced acidity and brightness, often replaced by a dull, sometimes slightly bitter or papery taste.
• Less crema in espresso shots.

While beans might still be palatable at 6-8 weeks with perfect storage, they are a shadow of their former selves. This is why understanding “how long do roasted coffee beans last” in terms of *optimal flavor* is crucial – it’s about the experience, not just safety. The goal is to capture that peak window.

Signs Your Coffee Beans Have Gone Bad (Beyond the Roast Date)

Relying solely on the calendar or a printed “best by” date is risky. Coffee freshness is highly dependent on storage conditions. Beans stored poorly might taste stale in 2 weeks, while perfectly stored beans might still be enjoyable at 5 weeks. Learning to identify the sensory signs of staleness or spoilage is your best defense against a bad cup. Here’s what to look and smell for:

The Nose Knows: Aroma is the First Clue

Your sense of smell is the most sensitive indicator. Fresh, high-quality roasted beans should have a strong, complex, and inviting aroma. It might be:

• Fruity (berry, citrus, stone fruit)
• Floral (jasmine, orange blossom)
• Sweet (chocolate, caramel, honey)
• Roasty (nutty, smoky, toasty)

If you open the container and are met with:

• Weak or absent aroma: This is the classic sign of staleness. The volatile compounds have largely escaped or oxidized.
• Cardboard, paper, or woody smell: Indicates significant oxidation and flavor degradation.
• Rancid, sour, or paint-like odor: This signals that the oils have gone bad (rancidity). **Do not brew these beans.** Rancid coffee can cause stomach upset and tastes terrible.
• Musty or moldy smell: A serious sign of moisture exposure and potential mold growth. **Discard immediately.**

Trust your nose – if it doesn’t smell vibrant and appealing, it won’t taste good.

Visual Inspection: Color and Texture Tell a Story

While color alone isn’t a perfect indicator (roast level varies), significant changes can be telling:

• Faded Color: Beans that have lost their rich, deep brown (for medium/dark roasts) or vibrant light brown (for light roasts) and look dull or ashy have likely been exposed to too much light or air.
• Excessive Oiliness: Some oil on dark roast beans is normal. However, if *all* beans (especially lighter roasts) appear excessively shiny or greasy, it often means the oils have migrated to the surface due to age or heat, and are likely beginning to turn rancid. Wipe a bean gently – if it leaves an oily residue on your finger, it’s a warning sign.
• Mold: Visible white, green, or black fuzzy spots are an absolute no-go. Discard the entire batch.

The Taste Test: The Final Confirmation

If the aroma and appearance are questionable but not alarming, brew a small cup. Stale or bad coffee typically tastes:

• Flat and lifeless: Lacking the bright acidity, sweetness, and complexity of fresh coffee.
• Papery, woody, or cardboard-like: The dominant flavor profile of oxidized beans.
• Rancid or sour: Unpleasant, sharp, or bitter notes indicating spoiled oils.
• Weak and watery: Even with correct brewing parameters, stale beans often produce a thin, unsatisfying cup.

If your coffee tastes significantly different (and worse) than you remember from the same beans when fresh, it’s time to toss them. Don’t waste your time or water on a subpar brew.

Proper Storage: The Key to Extending Your Beans’ Life

Now that you know why beans go stale and how to spot it, the million-dollar question is: how do you slow down this process and make your beans last as long as possible? The answer lies entirely in how you store them. Proper storage can easily double or triple the enjoyable life of your roasted coffee beans compared to leaving them in the bag they came in. It’s all about minimizing exposure to the four enemies of coffee freshness: **Oxygen, Light, Heat, and Moisture.**

Choosing the Right Container: Airtight is Non-Negotiable

The single most important factor is an **airtight container.** Oxygen is the primary driver of staleness. Every time you open the bag or container, you’re letting fresh oxygen rush in to attack the beans. Here’s what to look for:

• Material: Opaque ceramic, glass (with a tight seal), or high-quality food-grade plastic are best. Avoid clear glass if it will be stored where light hits it. Metal tins can work if truly airtight.
• Seal: A robust, gasket-sealed lid is essential. Simple screw-top lids often aren’t sufficient. Look for containers specifically designed for coffee (like those from Fellow, Airscape, or even a clean, dry mason jar with a tight lid).
• Size: Choose a container that holds just the amount of beans you’ll use in 1-2 weeks. A half-full large container means more stale air (oxygen) trapped inside with the beans, accelerating degradation. It’s better to have two smaller containers than one large, half-empty one.

**Crucially: Avoid the original bag once opened.** Most coffee bags have a one-way degassing valve, which is great *while sealed* to let CO2 out but not oxygen in. Once you open it, that valve is useless, and the bag offers poor protection against oxygen, light, and moisture. Transfer beans to your airtight container immediately after opening.

Location, Location, Location: Where to Keep Your Beans

Where you store your airtight container matters immensely:

• Cool & Dark: Heat speeds up chemical reactions (like oxidation). Store your container in a cool cupboard or pantry, **away from the stove, oven, dishwasher, or any heat source.** Never store beans on the counter near a window – light (especially UV) degrades flavors. A dark cupboard is ideal.
• Dry: Moisture is the enemy. Humidity can cause beans to absorb water, leading to mold or accelerating staling. Keep them away from the sink, dishwasher, or any humid area. Ensure your container is completely dry before adding beans.
• Avoid the Fridge (Seriously!): This is a common mistake. While cold, fridges are humid environments. Every time you take the container out, condensation forms on the cold beans as they warm up to room temperature. This moisture is disastrous. Fridges are also full of strong odors (onions, garlic, cheese) that beans readily absorb, ruining their flavor. **The fridge is almost always worse than a cool, dark cupboard for short-to-medium term storage (up to 2-3 months).**

Think of your beans like fine wine – they need a cool, dark, stable environment, not a fluctuating, humid one.

What NOT to Do: Common Storage Mistakes

Even with good intentions, these habits will sabotage your beans:

• Leaving the bag open: Oxygen floods in immediately. Fold the top and clip it? Better than nothing, but still poor. Transfer to airtight ASAP.
• Storing in the freezer without proper prep: We’ll cover freezing properly later, but tossing the open bag directly into the freezer causes condensation and freezer burn. Freezing requires specific steps.
• Using a container that isn’t truly airtight: That old coffee canister with the loose lid? It’s letting oxygen in constantly.
• Buying in bulk and storing for months at room temp: Unless you have perfect storage and consume very slowly, large bags are a recipe for stale coffee. Buy what you’ll use in 2-3 weeks.
• Grinding beans in advance: Pre-ground coffee stales incredibly fast – within minutes to hours. Always grind fresh.

Mastering proper storage is the most impactful step you can take to answer “how long do roasted coffee beans last” in a way that preserves delicious flavor.

Freezing Coffee Beans: Myth vs. Reality

When you have more beans than you can use within the typical 2-4 week peak window, or you find a great deal on a larger bag, freezing often seems like the obvious solution. But is it effective? Does it ruin the coffee? The answer is nuanced: **Freezing, when done *correctly*, is the absolute best method for preserving coffee bean freshness for the long term (3-6 months).** However, freezing done *incorrectly* can be worse than just storing at room temperature. Let’s separate the myth from the reality.

The Benefits: Why Freezing Works (When Done Right)

Freezing dramatically slows down the chemical reactions responsible for staling, primarily oxidation. At freezing temperatures (-18°C / 0°F or below), the movement of molecules slows to a near standstill. Oxygen reacts much more slowly with the coffee oils and compounds. The volatile aromatic compounds are also better preserved because the cold environment reduces their tendency to evaporate. Studies and extensive practical experience from roasters and serious home brewers confirm that properly frozen beans retain a remarkable amount of their original flavor profile, far superior to beans stored at room temperature for the same duration. If you must store beans beyond 4-6 weeks, freezing is the only viable method to maintain quality.

The Critical Steps: How to Freeze Beans Properly

The key to successful freezing is **minimizing exposure to air and moisture.** Here’s the step-by-step method:

1. Divide into Portions: Don’t freeze the whole bag. Divide the beans into airtight portions you’ll use in 1-2 weeks. This prevents you from repeatedly thawing and refreezing the same beans, which introduces moisture and oxygen each time.
2. Use Airtight, Freezer-Safe Containers: Vacuum-sealed bags are ideal. If you don’t have a vacuum sealer, use heavy-duty freezer bags (like Ziploc brand freezer bags) and remove as much air as possible using the water displacement method: Submerge the sealed bag (except the top seal) in water, forcing the air out, then seal completely. Alternatively, use rigid, airtight containers specifically designed for freezing (glass or BPA-free plastic).
3. Cool Completely: Ensure beans are at room temperature before freezing. Putting warm beans in the freezer causes condensation inside the container.
4. Label Clearly: Note the roast date and contents on the container/bag.
5. Freeze Immediately: Get the portions into the freezer as soon as possible after dividing.

**Crucially: Never refreeze thawed beans.** Once you take a portion out to use, keep it at room temperature and use it within 1-2 weeks. Thawing and refreezing introduces moisture and drastically accelerates staling.

Thawing and Using Frozen Beans

When you’re ready to use a frozen portion:

• Thaw in the Container: Take the sealed container/bag out of the freezer and let it come to room temperature *while still sealed*. This prevents condensation from forming on the cold beans as humid room air hits them. This might take 1-2 hours.
• Use Promptly: Once thawed to room temperature, open the container and use the beans within 1-2 weeks, storing the opened portion in your regular airtight container in a cool, dark place.
• Grind Frozen (Optional but Effective): Many coffee enthusiasts grind beans *while still frozen*. The cold makes the beans more brittle, potentially leading to a more uniform grind with less heat generation from the grinder, which can also degrade flavor. If you do this, grind only what you need immediately and store the rest of the thawed portion properly.

What Doesn’t Work: Freezing Mistakes to Avoid

These practices will ruin your frozen beans:

• Freezing in the Original Bag: The bag isn’t airtight enough for long-term freezing and offers poor protection against freezer burn.
• Freezing Large Quantities in One Bag: Every time you open it to get beans, you let in warm, moist air, causing ice crystals (freezer burn) and staling.
• Thawing at Room Temperature Then Re-Freezing: This cycle introduces massive amounts of moisture and oxygen.
• Using Thin Plastic Bags: They offer poor protection against oxygen and moisture vapor transmission over time.

Freezing isn’t magic, but done correctly, it’s the closest thing we have to a time machine for coffee beans, effectively answering “how long do roasted coffee beans last” by adding several months of quality preservation.

Grinding Beans: How It Dramatically Affects Freshness

While the focus is often on whole beans, the moment you grind coffee, you trigger an exponential acceleration in the staling process. Understanding this is crucial because **pre-ground coffee has a drastically shorter shelf life than whole beans – often measured in *days or even hours*, not weeks.** If you’re grinding beans ahead of time, you’re fundamentally changing the answer to “how long do roasted coffee beans last” for that specific coffee.

Why Grinding is a Freshness Killer

Whole beans have a protective outer layer (the silver skin and the bean structure itself) that limits the surface area exposed to oxygen. Grinding shatters this structure, creating hundreds or thousands of tiny particles with a massive increase in surface area. Imagine tearing a piece of paper into confetti – the confetti has way more surface exposed to the air than the whole sheet. This dramatically increases the rate at which oxygen can react with the coffee’s oils and compounds. Furthermore, grinding generates heat through friction in the burrs or blades. This heat can volatilize (evaporate) some of the delicate aromatic compounds immediately and also speed up oxidation reactions. The result? Pre-ground coffee loses its vibrant flavors and aromas at an alarming pace compared to whole beans.

How Fast Does Pre-Ground Coffee Stale?

The timeline for pre-ground coffee is shockingly short:

• Within Minutes: Significant loss of volatile aromatic compounds begins immediately. The enticing smell you get when grinding fresh beans fades quickly.
• Within 1-2 Hours: Noticeable decline in flavor complexity and aroma. The coffee starts to taste flatter.
• Within 24-48 Hours: Pre-ground coffee stored at room temperature in an open container becomes noticeably stale, tasting dull and papery. Even in a sealed container, quality degrades significantly.
• Beyond 1 Week: Pre-ground coffee is generally considered stale and produces a weak, unpleasant cup, regardless of storage (unless frozen, which has its own challenges).

Compare this to whole beans, which can maintain good quality for 2-4 weeks with proper storage. Grinding is the point of no return for rapid staling.

The Golden Rule: Grind Fresh, Every Time

The single most effective way to maximize the flavor potential of your roasted beans, regardless of their age (within reason), is to **grind them immediately before brewing.** This minimizes the time the increased surface area is exposed to oxygen. Here’s why it matters:

• Preserves Volatile Aromatics: Those delicate top notes (floral, fruity) are captured in the brew, not lost to the air before you even start.
• Ensures Optimal Extraction: Freshly ground coffee allows water to interact evenly with the particles, leading to a balanced extraction – not under-extracted (sour) or over-extracted (bitter).
• Maximizes Crema (for Espresso): The CO2 trapped within freshly ground particles is essential for forming that rich, creamy layer on top of an espresso shot.

Choosing the Right Grinder and Technique

Not all grinding is equal when it comes to preserving freshness:

• Burr Grinder > Blade Grinder: Burr grinders crush beans between two abrasive surfaces, producing more uniform particles with less heat generation and fines (tiny dust-like particles that over-extract and taste bitter). Blade grinders chop beans haphazardly, creating a mix of sizes and generating significant heat, accelerating staling *during* the grinding process. Invest in a burr grinder for the best flavor preservation.
• Grind Size Matters: Use the correct grind size for your brewing method (coarse for French press, medium for drip, fine for espresso). An incorrect grind size leads to poor extraction, masking any remaining freshness.
• Clean Your Grinder: Old coffee oils and grounds left in the grinder can become rancid and contaminate your fresh grind. Clean it regularly according to the manufacturer’s instructions.

If you truly cannot grind fresh (e.g., in an office setting), store pre-ground coffee in a truly airtight container in a cool, dark place and use it within **3-7 days at absolute most.** But understand that you’re sacrificing a huge amount of potential flavor. The effort of grinding fresh is minimal compared to the reward of a vastly superior cup. It’s the final, critical step in the journey from bean to brew.

Conclusion: Maximizing Every Sip of Your Coffee Journey

So, how long do roasted coffee beans last? The simple answer is: **it depends, but peak flavor is fleeting.** While beans remain *safe* to consume for months under ideal conditions, the vibrant, complex, and delicious coffee experience you crave is mostly confined to that precious 2-4 week window after roasting. Beyond that, even with perfect storage, you’re chasing a shadow of the coffee’s true potential. The enemies – oxygen, light, heat, and moisture – are constantly at work, slowly eroding the delicate flavors and aromas that make coffee so special.

The good news is that you hold the power to significantly influence this timeline. Understanding the science – the degassing, the oxidation – isn’t just interesting; it’s practical knowledge that transforms how you buy, store, and brew. Ditch the original bag once opened. Invest in a proper airtight container and keep it cool, dark, and dry. **Respect the grind:** never compromise on grinding fresh beans immediately before brewing – it’s the single biggest factor within your control for a great cup, day after day. When you have an abundance, freeze it correctly in small, airtight portions to capture that peak freshness for later enjoyment.

Coffee is a journey from farm to cup, and freshness is the bridge that connects the roaster’s artistry to your morning ritual. By paying attention to how long roasted coffee beans last in terms of *flavor*, not just safety, you honor that journey. You transform your daily brew from a mere caffeine delivery system into a moment of genuine pleasure and discovery. Stop settling for flat, stale coffee. Implement these storage and grinding practices, buy in smaller quantities, and savor the incredible difference that truly fresh roasted beans make. Your taste buds – and your coffee ritual – will thank you. Now, go enjoy that perfect cup.

Frequently Asked Questions

How long do roasted coffee beans last in the freezer?

Properly frozen coffee beans (in airtight, portioned containers) can maintain excellent quality for 3-6 months. The cold dramatically slows oxidation, preserving flavors far better than room temperature storage beyond 4-6 weeks.

Can you vacuum seal coffee beans for storage?

Yes, vacuum sealing is an excellent method for both short-term pantry storage and long-term freezing. It removes nearly all oxygen, the main cause of staleness, significantly extending freshness compared to regular containers.

Why does coffee taste better freshly roasted?

Freshly roasted beans (within 1-3 weeks) have optimal levels of carbon dioxide to protect flavors and create good crema, plus vibrant volatile aromatic compounds that degrade quickly with exposure to oxygen, light, and heat.

Should I buy coffee with a “best by” date or roast date?

Always prioritize the **roast date** over a “best by” date. The roast date tells you exactly when the beans were roasted, allowing you to track their true freshness window. “Best by” dates are often conservative estimates and less reliable.

Do dark roast beans last longer than light roast beans?

Generally, no. Darker roasts degas CO2 faster initially due to a more porous structure, potentially shortening their peak freshness window slightly compared to lighter roasts, which may have a more stable structure initially.

How do I store coffee beans after opening the bag?

Immediately transfer beans to a completely airtight container (ceramic, glass, or BPA-free plastic with a gasket seal). Store this container in a cool, dark, dry cupboard away from heat sources, light, and strong odors. Avoid the fridge.