Manville, WY 82222 Frost Dates
Frost dates for Manville, WY, ZIP 82222
Around 05/17 is the usual last spring frost, about 262 days away. The first fall frost typically arrives around 09/25, about 129 frost-free days later.
The USDA Plant Hardiness Zone Map puts Manville in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 4b around Manville has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/17 isn't a guarantee
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/05 and you're betting against frost in roughly 9 years out of 10. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Manville compares
At roughly 129 frost-free days, Manville places 38,516 of 40,283 ZIP codes in this dataset. Within WY, it ranks 69 of 192.
Learn more
the frost range explains how to read the range around Manville's dates instead of trusting one, and local microclimates explains what one yard in Manville can differ from the 82222 normal.