Toksook Bay, AK 99637 Frost Dates
99637, near Toksook Bay, AK: the frost window
The last spring frost here typically falls around 05/21, about 266 days from today. Fall's first freeze usually shows up around 09/22, roughly 122 days after the last spring frost.
Toksook Bay sits in USDA Zone 4a (-30 to -25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Toksook Bay's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Toksook Bay's last frost
05/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/02 and only about 1 year in 10 sees frost after that.
Toksook Bay against the rest of the dataset
Toksook Bay's growing season runs about 122 days, ranking 38,959 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 108 of 269.
Learn more
Two guides worth reading on 99637: local microclimates, on what one yard in Toksook Bay can differ from the 99637 normal, and zone vs. frost date, on why Zone 4a and Toksook Bay's frost date answer different questions.