What is the 15 / 15 /15 Coffee Rule?

What is the 15 / 15 /15 Coffee Rule?

The 15 / 15 / 15 Coffee Rule: Why Freshness Changes Everything

The 15 / 15 / 15 rule is all about timing:

  • Green (unroasted) coffee beans last about 15 months
  • Roasted coffee beans are best within 15 days
  • Ground coffee loses flavor within 15 minutes

1. Green Coffee Beans: 15 Months

Green coffee beans can last up to 15 months when stored properly—cool, dry, and away from light.

This is why sourcing matters so much. At TLC Roasters, we’re intentional about working with fresh, high-quality green coffee so that what we roast starts at its peak.

But once heat hits those beans? Everything changes.

2. Roasted Coffee Beans: 15 Days

Roasting unlocks the flavor, but it also starts the clock.

After roasting, coffee begins to release gases (called degassing) and gradually loses its complexity and vibrancy. While coffee doesn’t instantly “go bad,” it tastes best within about 15 days of roasting.

That’s when you’ll experience:

  • Brighter, more defined flavor notes
  • Better aroma
  • A fuller, more balanced cup

After that window, flavors start to flatten and fade.

This is why fresh-roasted coffee makes such a noticeable difference, and why we roast in small batches at TLC Roasters.

3. Ground Coffee: 15 Minutes

Once coffee is ground, its surface area increases dramatically, and it begins to lose aroma and flavor almost immediately.

Within 15 minutes, much of what makes coffee taste amazing is already fading.

That’s why we always recommend:

  • Grinding right before brewing
  • Only grinding what you need
  • Brewing immediately after grinding

If you’ve ever noticed pre-ground coffee tasting dull or lifeless, this is why.

Timing Is Everything

Think of your coffee beans like produce.

Would you eat a banana that’s been sitting on a shelf for months?

Of course not.

Don’t treat your coffee that way 🙂

Freshness isn’t just a detail, it’s the difference between a flat, forgettable cup and one that’s rich, aromatic, and full of life.

How to Put This Into Practice

You don’t need fancy equipment to follow the 15 / 15 / 15 rule—just a few simple habits:

  • Buy freshly roasted coffee (check the roast date!)
  • Use your beans within a couple of weeks
  • Store them in an airtight container away from heat and light
  • Grind right before brewing

 

At TLC Roasters, we’re here to make that easy. Fresh beans, roasted with care, ready when you are. Try out our subscriptions to get FRESH coffee delivered to your doorstep on a regular basis. SUBSCRIPTIONS

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