Look up your specific county on our frost-date pages — every US county has a NOAA-derived probability table showing the full range of historical frost dates at three temperature thresholds (28°F killing, 32°F light, 24°F hard). Microclimate within a county can shift dates 2-4 weeks, so adjust based on your elevation, slope, and proximity to water. State crop calendars also include county-relevant frost timing for individual crops.
Frost Dates & Planting Timing
When is the last frost date in my area?
The median last frost date varies by county and elevation, ranging from late February in the Deep South to mid-June in the Northern Rockies. The actual date in any given year can vary by 4-6 weeks from the median because frost timing is naturally variable. Use the conservative bound (the date 9 of 10 years are past their last frost) for unprotected transplants.
More from Frost Dates & Planting Timing
- What is the difference between a hardiness zone and a frost date?
- What does 50% frost probability mean?
- When is it safe to plant tomatoes outside?
- How do I use frost probability tables for planting decisions?
- What is a killing frost vs. a light frost?
- Can I plant earlier using row cover?
- How do I protect plants from a late spring frost?
- What crops can survive a frost?
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