Kaltag, AK 99748 Frost Dates
99748, near Kaltag, AK: the frost window
Typically, the last spring freeze lands around 05/25, roughly 270 days out. Fall's first freeze usually shows up around 09/03, roughly 101 days after the last spring frost.
Zone 2a (-50 to -45°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 Kaltag, not a forecast for this year.
Stretching the season past the first frost
Kaltag's growing season runs out in roughly 1 week — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
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.
Kaltag against the rest of the dataset
About 101 days separate Kaltag's last and first frost, putting it 39,695 of 40,283 ZIP codes nationally. Within AK, it ranks 191 of 269.
Learn more
Two guides worth reading on 99748: the frost range, on how to read the range around Kaltag's dates instead of trusting one, and local microclimates, on what one yard in Kaltag can differ from the 99748 normal.