Kobuk, AK 99751 Frost Dates
99751, near Kobuk, AK: the frost window
The last spring frost here typically falls around 05/18, about 263 days from today. Fall's first freeze usually shows up around 09/08, roughly 111 days after the last spring frost.
Kobuk sits in USDA Zone 1b (-55 to -50°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
Kobuk's growing season runs out in roughly 2 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/18 isn't a guarantee
05/18 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 06/01 and only about 1 year in 10 sees frost after that.
Kobuk against the rest of the dataset
About 111 days separate Kobuk's last and first frost, putting it 39,483 of 40,283 ZIP codes nationally. Within AK, it ranks 160 of 269.
Learn more
Two guides worth reading on 99751: the frost range, on how to read the range around Kobuk's dates instead of trusting one, and local microclimates, on what one yard in Kobuk can differ from the 99751 normal.