Upper Kalskag, AK 99607 Frost Dates
When can you plant in Upper Kalskag, AK?
Typically, the last spring freeze lands around 05/21, roughly 266 days out. The first fall frost typically arrives around 09/22, about 122 frost-free days later.
Zone 3b (-35 to -30°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 Upper Kalskag, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Upper Kalskag before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/21 isn't a guarantee
05/21 is the middle of 30 years of NOAA records, not a promise. Plant by 05/08 and you're betting against frost in roughly 9 years out of 10. 06/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Upper Kalskag compares
Upper Kalskag's growing season runs about 122 days, ranking 38,983 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 128 of 269.
Learn more
the frost range covers how to read the range around Upper Kalskag's dates instead of trusting one. local microclimates covers what one yard in Upper Kalskag can differ from the 99607 normal.