Fairbanks, AK 99725 Frost Dates
Fairbanks, AK: when does the frost end?
Around 05/24 is the usual last spring frost, about 269 days away. Fall's first freeze usually shows up around 09/01, roughly 98 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 1 week until Fairbanks's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/04 and only about 1 year in 10 sees frost after that.
Fairbanks against the rest of the dataset
At roughly 98 frost-free days, Fairbanks places 39,749 of 40,283 ZIP codes in this dataset. Within AK, it ranks 202 of 269.
Learn more
Before leaning on 99725's figures: local microclimates explains what one yard in Fairbanks can differ from the 99725 normal, while zone vs. frost date explains why Zone 3b and Fairbanks's frost date answer different questions.