Atka, AK 99547 Frost Dates
99547, near Atka, AK: the frost window
Around 05/31 is the usual last spring frost, about 276 days away. Fall's first freeze usually shows up around 10/05, roughly 128 days after the last spring frost.
Zone 8b (15 to 20°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 Atka, not a forecast for this year.
Stretching the season past the first frost
Atka's growing season runs out in roughly 5 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 Atka's last frost
05/31 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 06/23 and only about 1 year in 10 sees frost after that.
Atka against the rest of the dataset
About 128 days separate Atka's last and first frost, putting it 38,592 of 40,283 ZIP codes nationally. Within AK, it ranks 83 of 269.
Learn more
Two guides worth reading on 99547: the frost range, on how to read the range around Atka's dates instead of trusting one, and local microclimates, on what one yard in Atka can differ from the 99547 normal.