Hayti, SD 57241 Frost Dates
57241, near Hayti, SD: the frost window
The last spring frost here typically falls around 05/06, about 251 days from today. Fall's first freeze usually shows up around 10/01, roughly 145 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hayti 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
Hayti'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 Hayti's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/20 and only about 1 year in 10 sees frost after that.
Hayti against the rest of the dataset
About 145 days separate Hayti's last and first frost, putting it 36,268 of 40,283 ZIP codes nationally. Within SD, it ranks 241 of 378.
Learn more
Two guides worth reading on 57241: local microclimates, on what one yard in Hayti can differ from the 57241 normal, and zone vs. frost date, on why Zone 4b and Hayti's frost date answer different questions.