Fairbanks, AK 99706 Frost Dates
Frost dates for Fairbanks, AK, ZIP 99706
The last spring frost here typically falls around 05/16, about 261 days from today. The first fall frost typically arrives around 09/08, about 114 frost-free days later.
Zone 3b (-35 to -30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Fairbanks, not a forecast for this year.
What to do before the first frost
Zone 3b around Fairbanks has about 2 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Fairbanks's last frost
05/16 is the middle of 30 years of NOAA records, not a promise. Plant by 05/05 and you're betting against frost in roughly 9 years out of 10. 05/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fairbanks compares
At roughly 114 frost-free days, Fairbanks places 39,349 of 40,283 ZIP codes in this dataset. Within AK, it ranks 144 of 269.
Learn more
local microclimates explains what one yard in Fairbanks can differ from the 99706 normal, and zone vs. frost date explains why Zone 3b and Fairbanks's frost date answer different questions.