Manville, WY 82227 Frost Dates
82227, near Manville, WY: the frost window
Typically, the last spring freeze lands around 05/25, roughly 270 days out. Fall's first freeze usually shows up around 09/15, roughly 112 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Manville 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
Manville'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.
How much risk comes with planting early here
05/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/11 and only about 1 year in 10 sees frost after that.
Manville against the rest of the dataset
At roughly 112 frost-free days, Manville places 39,447 of 40,283 ZIP codes in this dataset. Within WY, it ranks 126 of 192.
Learn more
Two guides worth reading on 82227: zone vs. frost date, on why Zone 5a and Manville's frost date answer different questions, and the frost range, on how to read the range around Manville's dates instead of trusting one.