Cheyenne, WY 82010 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.
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
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.
How much risk comes with planting early here
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
About 141 days separate Cheyenne's last and first frost, putting it 36,864 of 40,283 ZIP codes nationally. Within WY, it ranks 27 of 192.
Learn more
zone vs. frost date covers why Zone 5b and Cheyenne's frost date answer different questions. the frost range covers how to read the range around Cheyenne's dates instead of trusting one.