Cheyenne, WY 82003 Frost Dates
When can you plant in Cheyenne, WY?
Typically, the last spring freeze lands around 05/12, roughly 257 days out. The first fall frost typically arrives around 10/01, about 141 frost-free days later.
The USDA Plant Hardiness Zone Map puts Cheyenne in Zone 5b (-15 to -10°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
About 5 weeks of growing season left in Cheyenne before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Cheyenne's last frost
05/12 is the middle of 30 years of NOAA records, not a promise. Plant by 05/01 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cheyenne compares
At roughly 141 frost-free days, Cheyenne places 36,861 of 40,283 ZIP codes in this dataset. Within WY, it ranks 24 of 192.
Learn more
the frost range covers how to read the range around Cheyenne's dates instead of trusting one. local microclimates covers what one yard in Cheyenne can differ from the 82003 normal.