Burlington, WY 82422 Frost Dates
Frost dates for Burlington, WY, ZIP 82422
Around 05/12 is the usual last spring frost, about 257 days away. The first fall frost typically arrives around 09/28, about 136 frost-free days later.
The USDA Plant Hardiness Zone Map puts Burlington 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 Burlington 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.
How much risk comes with planting early here
05/12 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Burlington compares
Burlington's growing season runs about 136 days, ranking 37,779 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 45 of 192.
Learn more
zone vs. frost date explains why Zone 5a and Burlington's frost date answer different questions, and the frost range explains how to read the range around Burlington's dates instead of trusting one.