Frannie, WY 82423 Frost Dates
Frost dates for Frannie, WY, ZIP 82423
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/01, about 148 frost-free days later.
The USDA Plant Hardiness Zone Map puts Frannie in Zone 5a (-20 to -15°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 5a around Frannie has about 5 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 05/06 isn't a guarantee
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 and you're betting against frost in roughly 9 years out of 10. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Frannie compares
At roughly 148 frost-free days, Frannie places 35,811 of 40,283 ZIP codes in this dataset. Within WY, it ranks 8 of 192.
Learn more
local microclimates explains what one yard in Frannie can differ from the 82423 normal, and zone vs. frost date explains why Zone 5a and Frannie's frost date answer different questions.