Dupree, SD 57636 Frost Dates
Dupree, SD: when does the frost end?
Around 05/08 is the usual last spring frost, about 253 days away. Fall's first freeze usually shows up around 10/01, roughly 144 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 Dupree, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Dupree's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Dupree's last frost
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Dupree against the rest of the dataset
About 144 days separate Dupree's last and first frost, putting it 36,440 of 40,283 ZIP codes nationally. Within SD, it ranks 259 of 378.
Learn more
Before leaning on 57636's figures: the frost range explains how to read the range around Dupree's dates instead of trusting one, while local microclimates explains what one yard in Dupree can differ from the 57636 normal.