What temp is medium roast? A coffee roaster targets an internal bean temperature between 410°F and 428°F (210°C to 220°C). This level happens right after first crack finishes and stops completely before second crack begins.
The short version
- Drop the beans into the cooling tray when the probe reads 410°F to 428°F.
- Stop the roast after first crack ends, but never let second crack start.
- Look for a dry, milk-chocolate brown bean surface with no visible oil drops.
- Keep your machine airflow steady so smoke leaves the drum immediately after first crack.
What temp is medium roast?
Heat causes chemical reactions that change the bean’s cell structure and sugars. As green coffee absorbs heat, water turns to steam, building high pressure inside the bean walls. Around 390°F to 400°F, this pressure breaks the bean structure open with an audible pop called first crack.
Once first crack stops, medium roasting begins. The coffee sugars caramelize without fully burning away into ash or heavy carbon. Complex organic acids break down just enough to soften harsh sour notes while keeping bright origin flavors intact. If you heat past 430°F, you trade away delicate fruit or floral flavors for generic roast smoke and bitter wood tastes. The trade-off is simple: medium roast gives you a balanced, sweet cup, but it lacks the thick, heavy body of a dark roast.
When the answer is different
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Different roasting setups and bean varieties require you to change your target numbers.
| Situation | What changes | What to do instead |
|---|---|---|
| Decaf green beans | Darkens very early | Rely on sound, not color |
| High-altitude beans | Denser bean structure | Apply more heat through drying |
| Natural process beans | Chaff burns faster | Lower air heat before crack |
How to do it properly
- Heat your drum to a charge temperature between 380°F and 400°F before loading beans.
- Pour 250 grams of green coffee into the hopper and close the chute tightly.
- Track the turning point where the probe temp stops dropping, usually around 90 seconds.
- Apply steady heat until the probe hits 300°F, checking that beans turn pale yellow.
- Listen for the first loud crack around 390°F, then lower burner power by 20 percent.
- Wait 90 to 120 seconds after first crack ends as the temperature reaches 415°F.
- Drop the coffee into the cooling tray when the probe displays 420°F.
- Stir the beans over strong suction until they feel cool to your touch.
The mistakes that ruin it
- Roasting by bean color alone trickles out flat flavors because surface color lies when drum heat runs too high.
- Letting the batch reach second crack burns away delicate acidity and pushes the profile into dark roast territory.
- Forgetting to dump the chaff collector restricts drum airflow, which traps bitter smoke inside the roasting chamber.
- Cooling the roasted batch too slowly bakes the interior and destroys the sweet, vibrant fruit notes.
Frequently asked questions
What temp is medium dark roast?
Medium-dark roasts finish between 435°F and 445°F (224°C to 230°C). This level occurs right at the start of second crack. You’ll notice light spots of aromatic oil forming on the bean surface.
Can you roast medium coffee in an air fryer?
No, air fryers lack the focused heating power and precise airflow needed for consistent coffee roasting. Beans roast unevenly, leaving you with burnt outsides, raw centers, and a grassy taste in the cup.
How long does a medium roast take?
A typical batch takes between 9 and 12 minutes in a drum roaster.
What happens if you stop before first crack?
Your coffee will taste sour, grassy, and unpleasantly bread-like. Coffee beans must pass through first crack to make the internal starches soluble and easy to extract with hot water.
Does roast temperature change caffeine levels?
No, bean temperature changes caffeine amounts by a tiny fraction that you won’t taste. Darker roasts lose water weight and puff up larger, but caffeine molecules survive normal roasting temperatures easily.
Who is medium roast not for?
This roast level isn’t for people who want intense, smoky bitterness or heavy chocolate body for milk drinks. It preserves original fruit acidity that lovers of Italian dark roasts often dislike.
Does bean size change the roasting temperature?
Yes, this varies by model and bean screen size—check the label on your green coffee bag. Very large beans take longer to heat through to the center than small peaberry beans.
Final Thoughts
Once you’ve found a bag with this profile, try brewing it using a pour-over method to really highlight those balanced, sweet notes. It’s a great way to explore how different origins taste when they aren’t hidden by dark roasting. You’ll definitely enjoy the smooth, approachable cup it creates every morning.