Dayton, WY 82844 Frost Dates
82844, near Dayton, WY: the frost window
Around 05/24 is the usual last spring frost, about 269 days away. Fall's first freeze usually shows up around 09/18, roughly 114 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Dayton in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Dayton's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Dayton's last frost
05/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/07 and only about 1 year in 10 sees frost after that.
Dayton against the rest of the dataset
Dayton's growing season runs about 114 days, ranking 39,364 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 125 of 192.
Learn more
Two guides worth reading on 82844: the frost range, on how to read the range around Dayton's dates instead of trusting one, and local microclimates, on what one yard in Dayton can differ from the 82844 normal.