Granger, WY 82929 Frost Dates
Frost dates for Granger, WY, ZIP 82929
Around 05/24 is the usual last spring frost, about 269 days away. The first fall frost typically arrives around 09/22, about 120 frost-free days later.
The USDA Plant Hardiness Zone Map puts Granger 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 Granger 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.
The actual range around Granger's last frost
05/24 is the middle of 30 years of NOAA records, not a promise. Plant by 05/07 and you're betting against frost in roughly 9 years out of 10. 06/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Granger compares
About 120 days separate Granger's last and first frost, putting it 39,118 of 40,283 ZIP codes nationally. Within WY, it ranks 106 of 192.
Learn more
local microclimates explains what one yard in Granger can differ from the 82929 normal, and zone vs. frost date explains why Zone 5a and Granger's frost date answer different questions.