Quinhagak, AK 99655 Frost Dates
99655, near Quinhagak, 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.
The USDA Plant Hardiness Zone Map puts Quinhagak in Zone 4b (-25 to -20°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
Quinhagak'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.
Why 05/21 isn't a guarantee
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.
Quinhagak against the rest of the dataset
Quinhagak's growing season runs about 122 days, ranking 38,955 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 107 of 269.
Learn more
Two guides worth reading on 99655: zone vs. frost date, on why Zone 4b and Quinhagak's frost date answer different questions, and the frost range, on how to read the range around Quinhagak's dates instead of trusting one.