Dupree, SD 57623 Frost Dates
57623, near Dupree, SD: the frost window
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.
The USDA Plant Hardiness Zone Map puts Dupree 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
Dupree's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
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 36,439 of 40,283 ZIP codes nationally. Within SD, it ranks 258 of 378.
Learn more
Two guides worth reading on 57623: local microclimates, on what one yard in Dupree can differ from the 57623 normal, and zone vs. frost date, on why Zone 4b and Dupree's frost date answer different questions.