Jackson, WY 83011 Frost Dates
Frost dates for Jackson, WY, ZIP 83011
Around 06/24 is the usual last spring frost, about 300 days away. The first fall frost typically arrives around 08/28, about 63 frost-free days later.
The USDA Plant Hardiness Zone Map puts Jackson 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 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.
Why 06/24 isn't a guarantee
06/24 is the middle of 30 years of NOAA records, not a promise. Plant by 06/08 and you're betting against frost in roughly 9 years out of 10. 07/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jackson compares
Jackson's growing season runs about 63 days, ranking 40,171 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 181 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 83011 normal.