Cheyenne, WY 82005 Frost Dates
Frost dates for Cheyenne, WY, ZIP 82005
Around 05/14 is the usual last spring frost, about 259 days away. The first fall frost typically arrives around 10/01, about 139 frost-free days later.
Cheyenne sits in USDA Zone 5b (-15 to -10°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 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
At roughly 139 frost-free days, Cheyenne places 37,206 of 40,283 ZIP codes in this dataset. Within WY, it ranks 32 of 192.
Learn more
the frost range explains how to read the range around Cheyenne's dates instead of trusting one, and local microclimates explains what one yard in Cheyenne can differ from the 82005 normal.