Sheridan, WY 59025 Frost Dates
Sheridan, WY: when does the frost end?
The last spring frost here typically falls around 05/18, about 263 days from today. Fall's first freeze usually shows up around 09/24, roughly 127 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
With roughly 4 weeks until Sheridan's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Sheridan's last frost
05/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/02 and only about 1 year in 10 sees frost after that.
Sheridan against the rest of the dataset
Sheridan's growing season runs about 127 days, ranking 38,606 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 71 of 192.
Learn more
Before leaning on 59025's figures: local microclimates explains what one yard in Sheridan can differ from the 59025 normal, while zone vs. frost date explains why Zone 5a and Sheridan's frost date answer different questions.