Ambler, AK 99786 Frost Dates
Frost dates for Ambler, AK, ZIP 99786
The last spring frost here typically falls around 05/18, about 263 days from today. The first fall frost typically arrives around 09/08, about 111 frost-free days later.
The USDA Plant Hardiness Zone Map puts Ambler in Zone 2a (-50 to -45°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 2a around Ambler 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.
How much risk comes with planting early here
05/18 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. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ambler compares
Ambler's growing season runs about 111 days, ranking 39,478 of 40,283 US ZIP codes measured here, longest to shortest. Within AK, it ranks 157 of 269.
Learn more
local microclimates explains what one yard in Ambler can differ from the 99786 normal, and zone vs. frost date explains why Zone 2a and Ambler's frost date answer different questions.