Frost Date Calculator
Find your average first and last frost dates to plan your planting season with confidence.
Enter a 5-digit US zip code. Covers 30 major metro areas.
Last Spring Frost
First Fall Frost
Growing Season (days)
USDA Zone
Mini Planting Calendar
| Crop | Start Indoors | Transplant / Outdoor |
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How It Works
Frost dates are based on 30-year climate normals from the NOAA National Centers for Environmental Information. The "last spring frost" is the average date of the last 32°F freeze in spring, and the "first fall frost" is the average date of the first 32°F freeze in autumn.
Growing Season (days) = First Fall Frost − Last Spring Frost
Spring Planting = Last Frost + 14 days (safety margin)
Start Indoors = Last Frost − (weeks before frost × 7 days)
Transplant = Last Frost + (weeks after frost × 7 days)
Direct Sow = Last Frost + (weeks after frost × 7 days)
Why 30-Year Normals?
Climate data is averaged over 30 years to smooth out year-to-year variability. Your actual frost dates may vary by 1-2 weeks in any given year. Always harden off seedlings and watch the 10-day forecast before transplanting.