Anchorage, AK 99506 Frost Dates
Anchorage, AK: when does the frost end?
The last spring frost here typically falls around 05/01, about 246 days from today. Fall's first freeze usually shows up around 09/29, roughly 150 days after the last spring frost.
Anchorage sits in USDA Zone 5a (-20 to -15°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
With roughly 5 weeks until Anchorage's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Anchorage against the rest of the dataset
Anchorage's growing season runs about 150 days, ranking 35,236 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 48 of 269.
Learn more
Before leaning on 99506's figures: zone vs. frost date explains why Zone 5a and Anchorage's frost date answer different questions, while the frost range explains how to read the range around Anchorage's dates instead of trusting one.