Medicine Bow, WY 82058 Frost Dates
Frost dates for Medicine Bow, WY, ZIP 82058
The last spring frost here typically falls around 06/02, about 278 days from today. The first fall frost typically arrives around 09/09, about 99 frost-free days later.
Medicine Bow sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 5a around Medicine Bow 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.
How much risk comes with planting early here
06/02 is the middle of 30 years of NOAA records, not a promise. Plant by 05/18 and you're betting against frost in roughly 9 years out of 10. 06/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Medicine Bow compares
About 99 days separate Medicine Bow's last and first frost, putting it 39,739 of 40,283 ZIP codes nationally. Within WY, it ranks 142 of 192.
Learn more
local microclimates explains what one yard in Medicine Bow can differ from the 82058 normal, and zone vs. frost date explains why Zone 5a and Medicine Bow's frost date answer different questions.