Koyukuk, AK 99754 Frost Dates
Koyukuk, AK: when does the frost end?
Typically, the last spring freeze lands around 05/18, roughly 263 days out. Fall's first freeze usually shows up around 09/08, roughly 111 days after the last spring frost.
Koyukuk sits in USDA Zone 2a (-50 to -45°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 2 weeks until Koyukuk'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
05/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Koyukuk against the rest of the dataset
About 111 days separate Koyukuk's last and first frost, putting it 39,490 of 40,283 ZIP codes nationally. Within AK, it ranks 164 of 269.
Learn more
Before leaning on 99754's figures: local microclimates explains what one yard in Koyukuk can differ from the 99754 normal, while zone vs. frost date explains why Zone 2a and Koyukuk's frost date answer different questions.