St. George, AK 99591 Frost Dates
Frost dates for St. George, AK, ZIP 99591
Around 05/31 is the usual last spring frost, about 276 days away. The first fall frost typically arrives around 10/05, about 128 frost-free days later.
Zone 7a (0 to 5°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 St. George, not a forecast for this year.
What to do before the first frost
Zone 7a around St. George has about 5 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 St. George's last frost
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/10 and you're betting against frost in roughly 9 years out of 10. 06/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. George compares
At roughly 128 frost-free days, St. George places 38,591 of 40,283 ZIP codes in this dataset. Within AK, it ranks 82 of 269.
Learn more
the frost range explains how to read the range around St. George's dates instead of trusting one, and local microclimates explains what one yard in St. George can differ from the 99591 normal.