Cheyenne, WY 82001 Frost Dates
Frost dates for Cheyenne, WY, ZIP 82001
The last spring frost here typically falls around 05/14, about 259 days from today. The first fall frost typically arrives around 10/01, about 139 frost-free days later.
Zone 5b (-15 to -10°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 Cheyenne, not a forecast for this year.
What to do before the first frost
Zone 5b around Cheyenne 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.
Why 05/14 isn't a guarantee
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cheyenne compares
About 139 days separate Cheyenne's last and first frost, putting it 37,205 of 40,283 ZIP codes nationally. Within WY, it ranks 31 of 192.
Learn more
local microclimates explains what one yard in Cheyenne can differ from the 82001 normal, and zone vs. frost date explains why Zone 5b and Cheyenne's frost date answer different questions.