Frost Date Finder

From NOAA 1991–2020 normals

Frost Guides

What the freeze statistics behind the ZIP pages show when set side by side.

Why Frost Date Websites Give Different DatesThe same town can have a last frost a week or more apart on two websites. The reason is the probability each one prints, and the station it reads.
How the Frost Season Moved Between the 1981–2010 and 1991–2020 NormalsState by state, the change in the last spring frost, first fall frost and freeze-free season at stations in both sets of NOAA normals.
Where Frost Does Not Come Every YearThe places where a 32°F night comes in fewer than half of winters, and why a "last frost date" means little there.
The Latest Last Frost and the Earliest First Frost in the USThe towns with the latest spring frost, the earliest fall frost and the shortest freeze-free seasons, from NOAA station normals.
Longest and Shortest Growing Seasons in Every StateFor each state, the place with the longest and the shortest freeze-free season, and the gap between them.