Juneau, AK 99801 Frost Dates
99801, near Juneau, AK: the frost window
Typically, the last spring freeze lands around 05/04, roughly 249 days out. Fall's first freeze usually shows up around 10/03, roughly 150 days after the last spring frost.
Juneau sits in USDA Zone 6a (-10 to -5°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.
Stretching the season past the first frost
Juneau's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Juneau against the rest of the dataset
About 150 days separate Juneau's last and first frost, putting it 35,246 of 40,283 ZIP codes nationally. Within AK, it ranks 53 of 269.
Learn more
Two guides worth reading on 99801: local microclimates, on what one yard in Juneau can differ from the 99801 normal, and zone vs. frost date, on why Zone 6a and Juneau's frost date answer different questions.