Dillingham, AK 99576 Frost Dates
99576, near Dillingham, AK: the frost window
Around 05/26 is the usual last spring frost, about 271 days away. Fall's first freeze usually shows up around 09/15, roughly 111 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Dillingham in Zone 4a (-30 to -25°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
Dillingham's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Dillingham's last frost
05/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/11 and only about 1 year in 10 sees frost after that.
Dillingham against the rest of the dataset
About 111 days separate Dillingham's last and first frost, putting it 39,456 of 40,283 ZIP codes nationally. Within AK, it ranks 152 of 269.
Learn more
Two guides worth reading on 99576: local microclimates, on what one yard in Dillingham can differ from the 99576 normal, and zone vs. frost date, on why Zone 4a and Dillingham's frost date answer different questions.