Hooper Bay, AK 99604 Frost Dates
Frost dates for Hooper Bay, AK, ZIP 99604
The last spring frost here typically falls around 06/05, about 281 days from today. The first fall frost typically arrives around 09/03, about 88 frost-free days later.
Hooper Bay sits in USDA Zone 4b (-25 to -20°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 4b around Hooper Bay 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.
How much risk comes with planting early here
06/05 is the middle of 30 years of NOAA records, not a promise. Plant by 05/20 and you're betting against frost in roughly 9 years out of 10. 06/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hooper Bay compares
At roughly 88 frost-free days, Hooper Bay places 39,947 of 40,283 ZIP codes in this dataset. Within AK, it ranks 223 of 269.
Learn more
local microclimates explains what one yard in Hooper Bay can differ from the 99604 normal, and zone vs. frost date explains why Zone 4b and Hooper Bay's frost date answer different questions.