Grayling, AK 99590 Frost Dates
Grayling, AK: when does the frost end?
Around 05/25 is the usual last spring frost, about 270 days away. Fall's first freeze usually shows up around 09/03, roughly 101 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Grayling in Zone 3a (-40 to -35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 1 week until Grayling's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Grayling's last frost
05/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/11 and only about 1 year in 10 sees frost after that.
Grayling against the rest of the dataset
Grayling's growing season runs about 101 days, ranking 39,693 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 190 of 269.
Learn more
Before leaning on 99590's figures: local microclimates explains what one yard in Grayling can differ from the 99590 normal, while zone vs. frost date explains why Zone 3a and Grayling's frost date answer different questions.