Laramie, WY 82084 Frost Dates
82084, near Laramie, WY: the frost window
Around 05/31 is the usual last spring frost, about 276 days away. Fall's first freeze usually shows up around 09/19, roughly 110 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Laramie in Zone 5b (-15 to -10°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
Laramie'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.
Why 05/31 isn't a guarantee
05/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/15 and only about 1 year in 10 sees frost after that.
Laramie against the rest of the dataset
About 110 days separate Laramie's last and first frost, putting it 39,497 of 40,283 ZIP codes nationally. Within WY, it ranks 130 of 192.
Learn more
Two guides worth reading on 82084: the frost range, on how to read the range around Laramie's dates instead of trusting one, and local microclimates, on what one yard in Laramie can differ from the 82084 normal.