Kenai, AK 99611 Frost Dates
When can you plant in Kenai, AK?
Around 05/24 is the usual last spring frost, about 269 days away. The first fall frost typically arrives around 09/12, about 110 frost-free days later.
Kenai 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.
What to do before the first frost
About 2 weeks of growing season left in Kenai before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/24 isn't a guarantee
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 39,501 of 40,283 ZIP codes in this dataset. Within AK, it ranks 170 of 269.
Learn more
local microclimates covers what one yard in Kenai can differ from the 99611 normal. zone vs. frost date covers why Zone 5a and Kenai's frost date answer different questions.