Frost Date Calculator

The last frost date is the average date of the final spring frost in your area, after which it is generally safe to plant tender crops outdoors. The first frost date is the average date of the first fall frost, signaling the end of the growing season for frost-sensitive plants.

Frost dates are based on historical averages and represent a 50% probability. Actual frost can occur 2-3 weeks before or after the average date. For sensitive plants, wait 2 weeks after the average last frost date for extra safety.

Cover plants with frost blankets, old sheets, or row covers before sunset. Move container plants indoors. Water the soil before a frost event as moist soil retains heat better. Cold frames and cloches provide longer-term protection.

Your growing season is the number of days between your last spring frost and first fall frost. It ranges from under 100 days in northern zones to over 300 days in southern zones. Our calculator shows your specific growing season length.

Yes. Use cold frames, hoop houses, row covers, and mulching to extend your season by 4-8 weeks in both spring and fall. Many cool-season crops like kale, spinach, and carrots can tolerate light frosts and grow well past the first frost date.