Jackson, WY 83014 Frost Dates
Jackson, WY: when does the frost end?
Around 06/20 is the usual last spring frost, about 296 days away. Fall's first freeze usually shows up around 08/31, roughly 70 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Jackson in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly any day now until Jackson's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 06/20 isn't a guarantee
06/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 06/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/09 and only about 1 year in 10 sees frost after that.
Jackson against the rest of the dataset
Jackson's growing season runs about 70 days, ranking 40,122 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 170 of 192.
Learn more
Before leaning on 83014's figures: zone vs. frost date explains why Zone 5b and Jackson's frost date answer different questions, while the frost range explains how to read the range around Jackson's dates instead of trusting one.