Cold Bay, AK 99571 Frost Dates
Frost dates for Cold Bay, AK, ZIP 99571
Typically, the last spring freeze lands around 05/25, roughly 270 days out. The first fall frost typically arrives around 10/04, about 131 frost-free days later.
Cold Bay sits in USDA Zone 7a (0 to 5°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
Zone 7a around Cold Bay has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/25 isn't a guarantee
05/25 is the middle of 30 years of NOAA records, not a promise. Plant by 05/09 and you're betting against frost in roughly 9 years out of 10. 06/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cold Bay compares
About 131 days separate Cold Bay's last and first frost, putting it 38,346 of 40,283 ZIP codes nationally. Within AK, it ranks 77 of 269.
Learn more
zone vs. frost date explains why Zone 7a and Cold Bay's frost date answer different questions, and the frost range explains how to read the range around Cold Bay's dates instead of trusting one.