Evanston, WY 82930 Frost Dates
Frost dates for Evanston, WY, ZIP 82930
The last spring frost here typically falls around 06/12, about 288 days from today. The first fall frost typically arrives around 09/12, about 90 frost-free days later.
Evanston 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
Zone 5a around Evanston 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.
Why 06/12 isn't a guarantee
06/12 is the middle of 30 years of NOAA records, not a promise. Plant by 05/26 and you're betting against frost in roughly 9 years out of 10. 07/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Evanston compares
At roughly 90 frost-free days, Evanston places 39,910 of 40,283 ZIP codes in this dataset. Within WY, it ranks 144 of 192.
Learn more
the frost range explains how to read the range around Evanston's dates instead of trusting one, and local microclimates explains what one yard in Evanston can differ from the 82930 normal.