Alaska planting zones & frost dates

The 2 Alaska cities on this site fall in zones 2a, 5a. Last spring frost dates range from May 4 in Anchorage to May 21 in Fairbanks.

City	Zone	Last frost	First frost	Population
Anchorage	5a	May 4	Sep 24	289,600
Fairbanks	2a	May 21	Sep 1	31,732

Frost dates are 30%-risk dates from the nearest suitable NOAA station. Population: Census Vintage 2024 estimates.