Buffalo, WY 82840 Frost Dates
Buffalo, WY: when does the frost end?
The last spring frost here typically falls around 05/24, about 269 days from today. Fall's first freeze usually shows up around 09/23, roughly 120 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Buffalo in Zone 5a (-20 to -15°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 4 weeks until Buffalo's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/24 isn't a guarantee
05/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/09 and only about 1 year in 10 sees frost after that.
Buffalo against the rest of the dataset
Buffalo's growing season runs about 120 days, ranking 39,075 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 103 of 192.
Learn more
Before leaning on 82840's figures: local microclimates explains what one yard in Buffalo can differ from the 82840 normal, while zone vs. frost date explains why Zone 5a and Buffalo's frost date answer different questions.