Unalakleet, AK 99684 Frost Dates
Frost dates for Unalakleet, AK, ZIP 99684
The last spring frost here typically falls around 05/25, about 270 days from today. The first fall frost typically arrives around 09/03, about 101 frost-free days later.
Unalakleet sits in USDA Zone 3b (-35 to -30°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 3b around Unalakleet has about 1 week 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.
The actual range around Unalakleet's last frost
05/25 is the middle of 30 years of NOAA records, not a promise. Plant by 05/10 and you're betting against frost in roughly 9 years out of 10. 06/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Unalakleet compares
At roughly 101 frost-free days, Unalakleet places 39,682 of 40,283 ZIP codes in this dataset. Within AK, it ranks 187 of 269.
Learn more
zone vs. frost date explains why Zone 3b and Unalakleet's frost date answer different questions, and the frost range explains how to read the range around Unalakleet's dates instead of trusting one.