Jackson, WY 83002 Frost Dates
Frost dates for Jackson, WY, ZIP 83002
The last spring frost here typically falls around 06/20, about 296 days from today. The first fall frost typically arrives around 08/31, about 70 frost-free days later.
Jackson sits in USDA Zone 4b (-25 to -20°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 4b around Jackson has about any day now 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 Jackson's last frost
06/20 is the middle of 30 years of NOAA records, not a promise. Plant by 06/05 and you're betting against frost in roughly 9 years out of 10. 07/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jackson compares
At roughly 70 frost-free days, Jackson places 40,121 of 40,283 ZIP codes in this dataset. Within WY, it ranks 169 of 192.
Learn more
the frost range explains how to read the range around Jackson's dates instead of trusting one, and local microclimates explains what one yard in Jackson can differ from the 83002 normal.