Hoonah, AK 99829 Frost Dates
Frost dates for Hoonah, AK, ZIP 99829
Around 05/09 is the usual last spring frost, about 254 days away. The first fall frost typically arrives around 10/04, about 145 frost-free days later.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Hoonah, not a forecast for this year.
What to do before the first frost
Zone 7a around Hoonah 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 05/09 isn't a guarantee
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 07/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hoonah compares
Hoonah's growing season runs about 145 days, ranking 36,232 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 60 of 269.
Learn more
local microclimates explains what one yard in Hoonah can differ from the 99829 normal, and zone vs. frost date explains why Zone 7a and Hoonah's frost date answer different questions.