Seasons and sky
Frost Date
Direct answer
Frost Date: A Frost Date is a climatological estimate or probability date associated with the first or last occurrence of a stated cold-temperature threshold.
A Frost Date estimates seasonal freeze timing from local climate records.
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At a glance
- Found in
- Seasons & Earth Almanac
- Related
- Cooling Degree Day, Phenology, Astronomical Season, Equinox
A Frost Date estimates seasonal freeze timing from local climate records.
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The story behind Frost Date
Station records enabled agricultural services to replace folklore dates with probability-based freeze climatology.
Why Frost Date matters
Gardeners and growers need a risk window rather than a guarantee that cold will stop or start on one date.
Frost Date in practice: an example
A published last-spring 32-degree date at 50-percent probability means later freezes remain possible.
Where readings of Frost Date go wrong
It is a mistake to treat a Frost Date as a forecast; follow current National Weather Service frost and freeze products.
Sources and editorial method
Research references used for this entry include:
- NOAA NCEI: U.S. Climate Normals - Official methodology and data for climate normals, degree days, growing seasons, and freeze dates.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Last updated
- 2026-09-26
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Common questions
What is a Frost Date?
A Frost Date is a climatological estimate or probability date associated with the first or last occurrence of a stated cold-temperature threshold.
What do people get wrong about a Frost Date?
It is a mistake to treat a Frost Date as a forecast; follow current National Weather Service frost and freeze products.
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