Guernsey, WY 82214 Frost Dates
82214, near Guernsey, WY: the frost window
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/06, roughly 152 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Guernsey 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
Guernsey's growing season runs out in roughly 6 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
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Guernsey against the rest of the dataset
Guernsey's growing season runs about 152 days, ranking 34,803 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 4 of 192.
Learn more
Two guides worth reading on 82214: local microclimates, on what one yard in Guernsey can differ from the 82214 normal, and zone vs. frost date, on why Zone 5a and Guernsey's frost date answer different questions.