KillBean : about 8 weeks coffee resting
Hi guys — this is Yanyi, founder and roaster at KillBean.
I just joined Reddit today and wanted to open up a space for people to ask questions about coffee — not just KillBean. Feel free to ask me anything about roasting, brewing, sourcing, processing, resting coffee, etc.
I’ve noticed a lot of discussion recently around our suggested 8-week resting period, so I wanted to explain the reasoning behind it.
We roast our coffees quite light, meaning the beans have relatively low expansion during roasting and keep a very dense, hard structure. Coffee beans are naturally porous, but with lighter roasting, gases like CO₂ tend to stay trapped inside the bean for much longer.
On top of that, we removed the one-way valve from our coffee bags. Most people think the valve is only there to release gas, but it also allows aromatic compounds to escape over time. By sealing the coffee in a more isolated CO₂-rich environment, we’ve found it helps preserve volatile aromatics inside the bean for longer — a bit similar to how nitrogen is used in crisp packaging.
Does that mean you must wait 8 weeks before drinking the coffee? Not necessarily.
The coffee can still taste great much earlier. In our shop, we usually start brewing coffees around 5–7 days after roast and they already taste very enjoyable. But through our own testing, we’ve consistently found that many of our lighter roasted coffees peak around 8–12 weeks after roast, especially for filter brewing.
Another question people ask is: “Why not just sell coffee roasted a month ago then?”
We actually used to do that. But many customers strongly associate freshness with quality and preferred receiving coffees roasted closer to their order date. So nowadays we roast closer to dispatch while still recommending longer resting for the best flavour experience.
Curious to hear what everyone thinks about longer resting periods — and whether you’ve had similar experiences with lighter roasts