Kivalina, AK 99750 Frost Dates
99750, near Kivalina, AK: the frost window
Around 06/10 is the usual last spring frost, about 286 days away. Fall's first freeze usually shows up around 09/11, roughly 92 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Kivalina in Zone 3a (-40 to -35°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
Kivalina's growing season runs out in roughly 2 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 06/10 isn't a guarantee
06/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/23 and only about 1 year in 10 sees frost after that.
Kivalina against the rest of the dataset
About 92 days separate Kivalina's last and first frost, putting it 39,890 of 40,283 ZIP codes nationally. Within AK, it ranks 218 of 269.
Learn more
Two guides worth reading on 99750: local microclimates, on what one yard in Kivalina can differ from the 99750 normal, and zone vs. frost date, on why Zone 3a and Kivalina's frost date answer different questions.