Seward, AK 99664 Frost Dates
Frost dates for Seward, AK, ZIP 99664
The last spring frost here typically falls around 05/02, about 247 days from today. The first fall frost typically arrives around 10/07, about 158 frost-free days later.
Seward sits in USDA Zone 5b (-15 to -10°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 5b around Seward has about 6 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 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Seward compares
Seward's growing season runs about 158 days, ranking 32,986 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 35 of 269.
Learn more
zone vs. frost date explains why Zone 5b and Seward's frost date answer different questions, and the frost range explains how to read the range around Seward's dates instead of trusting one.