Seward, AK 99572 Frost Dates
When can you plant in Seward, AK?
Typically, the last spring freeze lands around 05/31, roughly 276 days out. The first fall frost typically arrives around 09/08, about 99 frost-free days later.
Seward sits in USDA Zone 5a (-20 to -15°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.
What to do before the first frost
About 2 weeks of growing season left in Seward before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Seward's last frost
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/19 and you're betting against frost in roughly 9 years out of 10. 06/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Seward compares
Seward's growing season runs about 99 days, ranking 39,732 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 200 of 269.
Learn more
the frost range covers how to read the range around Seward's dates instead of trusting one. local microclimates covers what one yard in Seward can differ from the 99572 normal.