Encampment, WY 80428 Frost Dates
Frost dates for Encampment, WY, ZIP 80428
Typically, the last spring freeze lands around 06/09, roughly 285 days out. The first fall frost typically arrives around 09/12, about 93 frost-free days later.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Encampment, not a forecast for this year.
What to do before the first frost
Zone 5a around Encampment has about 2 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 06/09 isn't a guarantee
06/09 is the middle of 30 years of NOAA records, not a promise. Plant by 05/25 and you're betting against frost in roughly 9 years out of 10. 06/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Encampment compares
At roughly 93 frost-free days, Encampment places 39,877 of 40,283 ZIP codes in this dataset. Within WY, it ranks 143 of 192.
Learn more
zone vs. frost date explains why Zone 5a and Encampment's frost date answer different questions, and the frost range explains how to read the range around Encampment's dates instead of trusting one.