Can zucchini survive cold temperatures?
Written by
Olivia Mitchell
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Zucchini is very sensitive to cool temperatures. When temperatures drop below 50°F (10 °C), they will exhibit visible stress (leaf curling, slowed growth, etc.), and temperatures below freezing will kill the plants. Once, I lost an entire planting overnight due to an unexpected frost. Because of that, I now study the weathercast religiously during planting time.
Use frost protection before the onset of freezing weather. Place row covers over crops when the weather forecast predicts temperatures below 50°F (10 °C). Weigh down the edges with soil or sandbags to prevent wind lift. Use old blankets as temporary insulation against sudden cold. Remove blankets during the daytime when the temperature is warmer than 60°F (15 °C) to allow pollination to occur.
Row Cover Setup
- Use 0.5 oz/sq yd fabric for 4°F protection
- Install hoops to prevent plant contact
- Anchor securely against winds
Container Strategies
- Move pots to garages during cold alerts
- Wrap containers with bubble wrap
- Group plants for shared warmth
Soil Warming
- Apply dark compost mulch
- Use water walls for thermal mass
- Bury compost for biological heat
Build microclimates to extend your growing season; plant near the southern side of a wall that radiates heat at night. Use paths made of gravel to act as thermal batteries. Dig a 12" trench around the beds to trap warm air. This helps me harvest 3 weeks longer than my neighbors.
Select cold-tolerant cultivars for adverse climates. 'Tromboncino' can tolerate short exposure to 34°F (1°C) after establishment, and 'Costata Romanesco' is more tolerant to temperature fluctuations than common types. Always remember to harden off seedlings properly before transplanting to robust outdoor conditions.
Read the full article: When to Plant Zucchini for a Bountiful Harvest
