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Frost-date calculator
Find last spring and first autumn frost dates for a US ZIP, with three risk levels.
Two surfaces, one shared engine. This tool uses frostdatecalculator.com’s existing backend for station selection and frost-date risk bands. That site remains separate. Get the result here without leaving Food Forest Tools.
Today (UTC): . This is not a frost forecast or a data refresh date.
LAST SPRING FROST
FIRST AUTUMN FROST
FROST-FREE SEASON
Nearby stations can miss elevation and frost pockets. Check local records and weather before planting.
Method & data sources
Frost dates come from NOAA NCEI U.S. Climate Normals 1991–2020 at a nearby station, using 32°F (0°C) air frost. The shared engine returns 10%, 50% and 90% risk bands. These are historical estimates, not safe planting dates. This simpler tool does not show the separate site’s NWS forecast, crop calendar or alerts. Not endorsed by NOAA.
Frost-date questions
Can I calculate frost dates here now?
Yes. Enter a five-digit US ZIP and choose a risk level. The result appears on this page, using the same backend as frostdatecalculator.com.
Will this replace frostdatecalculator.com?
No. That site stays separate. This simpler tool shares its engine and data sources, rather than duplicate its logic.
Does today’s date change the frost estimate?
The date is a current UTC reference, not a forecast or data update. Frost-date risk bands use the 1991–2020 historical baseline. Check local weather before planting.
Source
Visit the existing frostdatecalculator.com site ↗Research checked 2 November 2026. Product specifications and availability can change.