Sundance, WY 82729 Frost Dates
Sundance, WY: when does the frost end?
Typically, the last spring freeze lands around 05/21, roughly 266 days out. Fall's first freeze usually shows up around 09/25, roughly 124 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Sundance in Zone 4b (-25 to -20°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 Sundance's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Sundance's last frost
05/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/05 and only about 1 year in 10 sees frost after that.
Sundance against the rest of the dataset
Sundance's growing season runs about 124 days, ranking 38,852 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 83 of 192.
Learn more
Before leaning on 82729's figures: local microclimates explains what one yard in Sundance can differ from the 82729 normal, while zone vs. frost date explains why Zone 4b and Sundance's frost date answer different questions.