ROAST DATE VS. EXPIRATION DATE

The Number That Actually Tells You How Fresh Your Coffee Is

Most coffee bags have a "best by" date on them. It's usually 9–12 months from the roast date. What it tells you: this coffee won't make you sick before this date. What it doesn't tell you: when the coffee was roasted, how long it sat in a warehouse, or whether it tastes like anything.

The roast date is the number that actually matters. Here's why.

What Happens to Coffee After Roasting

When coffee is roasted, it undergoes a chemical transformation. Hundreds of compounds develop - the ones responsible for aroma, sweetness, acidity, and complexity. The roasting process also produces CO₂, which gets trapped inside the bean.

That CO₂ is your freshness indicator. For the first 4–14 days after roasting, the bean is still off-gassing CO₂ - which is why freshly roasted coffee blooms when you pour hot water over it. The bloom is CO₂ releasing. It also means the bean is still alive, in a sense. Peak flavor is typically between day 5 and day 30 after roasting.

After about 4–6 weeks, most of the CO₂ has dissipated. With no CO₂ to protect the bean, the oils on its surface begin to oxidize. Oxidized coffee goes flat first - the aroma fades, the complexity disappears. Then it goes stale. Then it tastes bitter and harsh.

None of this is captured by a "best by" date 12 months out.

Why Most Bags Don't Show the Roast Date

The short answer: it's not in their interest to show it.

Large-scale commercial roasters roast in bulk and distribute through retail channels that can take weeks or months. By the time a bag of coffee reaches a grocery store shelf, it might already be 3–4 months past the roast date. A "best by" date set 12 months out gives the product shelf life. A roast date would tell you the coffee is already stale.

Specialty roasters who sell direct - online or at farmers markets - have less to hide. If you're shipping coffee within days of roasting, you put the roast date on the bag because it's a selling point, not a liability.

How to Read a Coffee Bag

Good signs:

• Roast date clearly printed (not just "best by")

• Roast date is recent - ideally within 2–4 weeks of when you're buying

• One-way valve on the bag (CO₂ releases out; oxygen can't get in)

• Whole beans (more surface area exposed once ground)

Warning signs:

• Only "best by" date, no roast date

• "Best by" date more than 6 months away - means it was roasted long ago

• Pre-ground in a non-airtight package

• No information about when or where it was roasted

What We Do

Every bag of Brew Line Coffee has the roast date printed on it. We roast in small batches at Tailwind Roasting in Chicago. When you order online, we ship within days of roasting. At farmers markets, you're buying coffee that was roasted the same week.

That's not a premium feature - it's the baseline for what specialty coffee should be. We just make it visible so you can verify it yourself.

→  See the roast date before you buy. All four Brew Line blends - Milwaukee & Damen, Clark & Diversey, State & Lake, Michigan & Wacker - at brewlinechicagocoffee.com

FAQ

Q: What is a coffee roast date?

A: The roast date is the date the coffee was roasted - when the green beans were transformed into the coffee you brew. It's different from a "best by" or expiration date. The roast date tells you how fresh the coffee is; a "best by" date tells you when it stops being safe to drink.

Q: How long is coffee good after the roast date?

A: Peak flavor is between 5 and 30 days after roasting. After 4–6 weeks, the coffee is still drinkable but loses complexity. After 3–4 months, it's noticeably flat or stale. Ground coffee goes stale much faster than whole beans - within days of grinding.

Q: Why don't most coffee bags show the roast date?

A: Most large-scale roasters distribute through retail channels where the coffee sits for weeks or months before reaching you. A roast date would reveal the coffee is already old. Small-batch roasters who sell direct - online or at farmers markets - show the roast date because their coffee ships fresh.