Burlington, WY 82434 Frost Dates
82434, near Burlington, WY: the frost window
Typically, the last spring freeze lands around 05/12, roughly 257 days out. Fall's first freeze usually shows up around 09/28, roughly 136 days after the last spring frost.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Burlington, not a forecast for this year.
Stretching the season past the first frost
Burlington's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/27 and only about 1 year in 10 sees frost after that.
Burlington against the rest of the dataset
About 136 days separate Burlington's last and first frost, putting it 37,780 of 40,283 ZIP codes nationally. Within WY, it ranks 46 of 192.
Learn more
Two guides worth reading on 82434: the frost range, on how to read the range around Burlington's dates instead of trusting one, and local microclimates, on what one yard in Burlington can differ from the 82434 normal.