Articles
Guides to frost dates, frost odds and planting windows, built from NOAA station data.
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Colorado Last Frost Dates: 10%, 50% and 90% Odds by Station
Spring and fall freeze dates for 210 Colorado stations from NOAA's 1991-2020 normals, from the Eastern Plains to the high valleys, with 10%-90% odds.
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Frost Odds by ZIP: Your Chance of Frost After Any Date
Your 'last frost date' is a coin flip. Turn NOAA's 10%-90% frost probabilities into the odds of a freeze after any planting date, with worked examples.
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Is It Too Late to Plant? The Fall Planting Countdown
Planting in October? Add days to maturity plus a two-week fall factor, then check your frost odds. Worked examples for stations near seven U.S. cities.
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Last Frost Dates by State: 10%, 50% and 90% Odds Tables
Spring and fall frost dates for every U.S. state from NOAA's 1991-2020 Climate Normals, with the full range from 10% to 90% odds and how to read them.