Kenai, AK 99635 Frost Dates
Frost dates for Kenai, AK, ZIP 99635
The last spring frost here typically falls around 05/24, about 269 days from today. The first fall frost typically arrives around 09/12, about 110 frost-free days later.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Kenai, not a forecast for this year.
What to do before the first frost
Zone 4b around Kenai has about 2 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Kenai's last frost
05/24 is the middle of 30 years of NOAA records, not a promise. Plant by 05/08 and you're betting against frost in roughly 9 years out of 10. 06/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Kenai compares
At roughly 110 frost-free days, Kenai places 39,502 of 40,283 ZIP codes in this dataset. Within AK, it ranks 171 of 269.
Learn more
the frost range explains how to read the range around Kenai's dates instead of trusting one, and local microclimates explains what one yard in Kenai can differ from the 99635 normal.