My Planting Calendar

Alaska frost dates

Across Alaska, the average last spring frost is around May 17 and the average first fall frost around September 13 — roughly 119 frost-free days. USDA zones 1a, 2b, 3b, 4b, 5b, 6b, 7b, 8b.

Risk you acceptLast spring frost byFirst fall frost by
Cautious (~10%)May 31August 30
Average (~50%)May 17September 13
Gambler (~90%)May 3September 27

Alaska spans a wide range of elevations and climates — your town’s dates can differ from the state average by two weeks or more. Look up your exact ZIP.

→ Turn these into sowing dates with the Alaska planting calendar, or look up an exact ZIP code.

Statewide average from NOAA/NCEI freeze normals. Cautious/gambler dates are about two weeks either side of the average.