Sheridan, WY 82833 Frost Dates
When can you plant in Sheridan, WY?
Around 05/17 is the usual last spring frost, about 262 days away. The first fall frost typically arrives around 09/28, about 132 frost-free days later.
Sheridan 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
About 4 weeks of growing season left in Sheridan before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/17 isn't a guarantee
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sheridan compares
Sheridan's growing season runs about 132 days, ranking 38,163 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 57 of 192.
Learn more
zone vs. frost date covers why Zone 5a and Sheridan's frost date answer different questions. the frost range covers how to read the range around Sheridan's dates instead of trusting one.