Juneau, AK 99821 Frost Dates
Juneau, AK: when does the frost end?
Typically, the last spring freeze lands around 04/11, roughly 226 days out. Fall's first freeze usually shows up around 11/01, roughly 202 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 9 weeks until Juneau's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Juneau against the rest of the dataset
At roughly 202 frost-free days, Juneau places 17,133 of 40,283 ZIP codes in this dataset. Within AK, it ranks 3 of 269.
Learn more
Before leaning on 99821's figures: local microclimates explains what one yard in Juneau can differ from the 99821 normal, while zone vs. frost date explains why Zone 7a and Juneau's frost date answer different questions.