Fermentation temperature charts give homebrewers a reference for matching yeast strains to temperature ranges and predicting how temperature choices will affect the finished beer. The right temperature for any given fermentation isn't a single number, it's a range, and where within that range you ferment determines the balance of flavors the yeast produces. This guide covers the temperature ranges for common homebrew yeast strains and explains what happens at each phase of fermentation.
Ale yeast fermentation temperature ranges
| Yeast strain | Optimal range | Low end character | High end character |
|---|---|---|---|
| US-05 / WLP001 / WY1056 (Chico) | 60–72°F / 15–22°C | Clean, crisp, neutral | Slightly fruity; still clean |
| S-04 / WLP002 / WY1968 (English) | 64–72°F / 18–22°C | Clean English character | Fruity esters, low diacetyl risk |
| WY3787 / WLP530 (Trappist High Gravity) | 65–78°F / 18–26°C | Restrained esters | Fruity, spicy; classic Belgian character |
| WLP300 / WY3068 (Hefeweizen) | 62–72°F / 17–22°C | More clove (4VG), less banana | More banana (isoamyl acetate), less clove |
| WY3724 / WLP565 (Belgian Saison) | 68–95°F / 20–35°C | May stall below 75°F/24°C | Full saison character; must go warm |
| WY1214 / WLP500 (Chimay-style) | 65–75°F / 18–24°C | Fruity, restrained | Rich dark fruit, spice |
Lager yeast fermentation temperature ranges
| Yeast strain | Fermentation temp | Lagering temp | Character |
|---|---|---|---|
| W-34/70 / WLP830 / WY2124 (Bohemian) | 48–55°F / 9–13°C | 32–36°F / 0–2°C | Clean, malty; classic pilsner/lager |
| WLP833 / WY2308 (Munich) | 48–55°F / 9–13°C | 32–36°F / 0–2°C | Slightly malty; smooth lager character |
| WY2565 (Kölsch) | 56–62°F / 13–17°C | 32–40°F / 0–4°C | Clean, slightly fruity; ale-lager hybrid |
| WLP029 (German Ale/Kölsch) | 62–69°F / 17–21°C | Optional cold crash | Clean with slight fruitiness at top range |
Temperature phases during fermentation
Pitching temperature: pitch at the low end of the yeast's range to reduce lag phase stress and minimize early fusel production. Active fermentation: maintain or allow a 2–3°F rise as fermentation generates heat. Diacetyl rest (ales): hold at 68–72°F/20–22°C for 48 hours near FG to ensure cleanup. Cold conditioning/lagering: drop to 32–38°F/0–3°C after fermentation is complete to improve clarity and polish flavors. The total timeline from pitch to packaging ranges from 10–14 days for a fast ale to 6–8 weeks for a properly conditioned lager.
Common Questions
Can I ferment a lager at ale temperatures?
You can ferment a lager yeast at ale temperatures, this is commonly called a "quick lager" or "California Common" approach. W-34/70 and WLP830 can produce acceptable results at 60–65°F/15–18°C rather than the traditional 48–55°F/9–13°C, especially with extended lagering afterward. The result has slightly more ester character than a cold-fermented lager but is cleaner than an ale yeast at the same temperature. True-to-style German pilsners and Czech lagers require cold fermentation to develop their characteristic clean, malt-forward profile.
What's the quickest route to a drinkable homebrew?
For the fastest drinkable results: brew a lower-gravity ale (OG 1.040–1.050) with US-05 or S-04, ferment at 68°F/20°C, and condition for 5–7 days post-FG before cold crashing and packaging. A session pale ale or English bitter can be in the glass 2–3 weeks after brew day with this approach. Avoid lagers, high-gravity beers, and Belgian styles requiring long conditioning if time is the constraint. US-05 at standard gravity produces clean, well-attenuated beer faster than most other strains, making it the go-to choice for quick-turnaround batches.