Chefornak, AK 99561 Frost Dates
99561, near Chefornak, 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.
Chefornak 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
Chefornak'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 Chefornak'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.
Chefornak against the rest of the dataset
At roughly 122 frost-free days, Chefornak places 38,966 of 40,283 ZIP codes in this dataset. Within AK, it ranks 115 of 269.
Learn more
Two guides worth reading on 99561: the frost range, on how to read the range around Chefornak's dates instead of trusting one, and local microclimates, on what one yard in Chefornak can differ from the 99561 normal.