Frost Date Lookup
Typical frost windows by zone — historical averages, not a forecast.
Typical last spring frost
Apr 1 – Apr 15
Typical first fall frost
Oct 15 – Oct 31
Approx. growing season
~195 days
Common practice: start tender crops indoors 4–8 weeks before the last-frost window and transplant after it passes; count back from the first-fall-frost window for fall crops.
What is this tool?
Shows the typical last-spring-frost and first-fall-frost windows for USDA-style hardiness zones 3 through 10+, plus an approximate frost-free growing season. Windows are broad multi-year historical averages of the kind derived from NOAA freeze-date climatology and repeated across gardening references — actual dates vary two weeks or more year to year and shift with microclimate, so treat them as planning anchors (when to start seeds indoors, when to transplant), not predictions. Your local extension service has the most precise local data.
How to use it
- Pick your hardiness zone (check the USDA zone map if unsure).
- Read the typical last spring frost and first fall frost windows.
- Count back from the windows to plan seed starting and fall planting.
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