Mills, WY 82644 Frost Dates
Mills, WY: when does the frost end?
The last spring frost here typically falls around 05/10, about 255 days from today. Fall's first freeze usually shows up around 09/29, roughly 138 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mills 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 5 weeks until Mills's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/10 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 05/24 and only about 1 year in 10 sees frost after that.
Mills against the rest of the dataset
Mills's growing season runs about 138 days, ranking 37,381 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 35 of 192.
Learn more
Before leaning on 82644's figures: zone vs. frost date explains why Zone 5a and Mills's frost date answer different questions, while the frost range explains how to read the range around Mills's dates instead of trusting one.