Sheridan, WY 82801 Frost Dates
82801, near Sheridan, WY: the frost window
Around 05/21 is the usual last spring frost, about 266 days away. Fall's first freeze usually shows up around 09/23, roughly 123 days after the last spring frost.
Zone 5a (-20 to -15°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 Sheridan, not a forecast for this year.
Stretching the season past the first frost
Sheridan's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/06 and only about 1 year in 10 sees frost after that.
Sheridan against the rest of the dataset
Sheridan's growing season runs about 123 days, ranking 38,883 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 84 of 192.
Learn more
Two guides worth reading on 82801: the frost range, on how to read the range around Sheridan's dates instead of trusting one, and local microclimates, on what one yard in Sheridan can differ from the 82801 normal.