Capsicum species have distinct temperature requirements at each growth stage — germination, seedling development, vegetative growth, flowering, and overwintering. Getting these right directly affects germination rates, fruit set, and plant survival. The table below gives target ranges by species.
Quick Reference
- C. annuum and C. baccatum: similar requirements, most flexible species
- C. chinense and C. frutescens: need more heat; 80–90°F for germination
- C. pubescens: cooler than all others; germinate at 65–75°F
- All species: keep nighttime temps above 55°F during fruiting
- Overwintering minimum: 40–55°F depending on species
Temperature Targets by Species and Growth Stage
| Species | Germination (°F / °C) |
Seedling Growth (°F / °C) |
Vegetative Growth (°F / °C) |
Flowering & Fruiting (°F / °C) |
Nighttime Minimum (°F / °C) |
Overwintering (°F / °C) |
|---|---|---|---|---|---|---|
| C. annuum | 75–85 / 24–29 | 70–80 / 21–27 | 70–85 / 21–29 | 70–85 / 21–29 | 55–60 / 13–16 | 45–55 / 7–13 |
| C. chinense | 80–90 / 27–32 | 75–85 / 24–29 | 75–90 / 24–32 | 75–90 / 24–32 | 60–65 / 16–18 | 50–60 / 10–16 |
| C. baccatum | 75–85 / 24–29 | 70–80 / 21–27 | 70–85 / 21–29 | 70–85 / 21–29 | 55–60 / 13–16 | 45–55 / 7–13 |
| C. frutescens | 80–90 / 27–32 | 75–85 / 24–29 | 75–90 / 24–32 | 75–90 / 24–32 | 60–66 / 16–18 | 50–60 / 10–16 |
| C. pubescens | 65–75 / 18–24 | 60–75 / 16–24 | 60–75 / 16–24 | 60–75 / 16–24 | 45–55 / 7–13 | 40–50 / 4–10 |
| C. galapagoense | 80–90 / 27–32 | 75–85 / 24–29 | 75–85 / 24–29 | 75–85 / 24–29 | 60–65 / 16–18 | 50–60 / 7–13 |
| C. chacoense | 75–85 / 24–29 | 70–80 / 21–27 | 70–85 / 21–29 | 70–85 / 21–29 | 55–60 / 13–16 | 45–55 / 7–13 |
| C. eximium | 75–85 / 24–29 | 70–80 / 21–27 | 70–85 / 21–29 | 70–85 / 21–29 | 55–60 / 13–16 | 45–55 / 7–13 |
| C. cardenasii | 75–85 / 24–29 | 70–80 / 21–27 | 70–85 / 21–29 | 70–85 / 21–29 | 55–60 / 13–16 | 45–55 / 7–13 |
Grower’s Takeaway
- C. pubescens is the exception: germinate cooler (65–75°F) and grow cooler than all other species
- C. chinense and C. frutescens need 80–90°F to germinate reliably — don’t skimp on bottom heat
- Nighttime temps below 55°F during flowering will cause blossom drop in most species
- Overwintering: even minimal heat (40–50°F) keeps most species alive — don’t let roots freeze
- Use the table as a calibration reference — your thermometer placement matters more than the numbers
Sources & Further Reading
- Priest, C.T., and D.J. Austin. The Chile Pepper Almanac. Harambe Publishing, 2026. Amazon