Juneau, AK 99802 Frost Dates
When can you plant in Juneau, AK?
Around 05/09 is the usual last spring frost, about 254 days away. The first fall frost typically arrives around 10/04, about 146 frost-free days later.
The USDA Plant Hardiness Zone Map puts Juneau in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 5 weeks of growing season left in Juneau before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Juneau compares
About 146 days separate Juneau's last and first frost, putting it 36,017 of 40,283 ZIP codes nationally. Within AK, it ranks 58 of 269.
Learn more
local microclimates covers what one yard in Juneau can differ from the 99802 normal. zone vs. frost date covers why Zone 7a and Juneau's frost date answer different questions.