Superior, WY 82945 Frost Dates
82945, near Superior, WY: the frost window
The last spring frost here typically falls around 05/22, about 267 days from today. Fall's first freeze usually shows up around 09/28, roughly 126 days after the last spring frost.
Superior 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.
Stretching the season past the first frost
Superior'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.
The actual range around Superior's last frost
05/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/09 and only about 1 year in 10 sees frost after that.
Superior against the rest of the dataset
About 126 days separate Superior's last and first frost, putting it 38,727 of 40,283 ZIP codes nationally. Within WY, it ranks 75 of 192.
Learn more
Two guides worth reading on 82945: the frost range, on how to read the range around Superior's dates instead of trusting one, and local microclimates, on what one yard in Superior can differ from the 82945 normal.