Wilmot, SD 57279 Frost Dates
Wilmot, SD: when does the frost end?
The last spring frost here typically falls around 05/05, about 250 days from today. Fall's first freeze usually shows up around 10/01, roughly 149 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Wilmot 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 5 weeks until Wilmot'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
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Wilmot against the rest of the dataset
About 149 days separate Wilmot's last and first frost, putting it 35,563 of 40,283 ZIP codes nationally. Within SD, it ranks 183 of 378.
Learn more
Before leaning on 57279's figures: the frost range explains how to read the range around Wilmot's dates instead of trusting one, while local microclimates explains what one yard in Wilmot can differ from the 57279 normal.