Turton, SD 57477 Frost Dates
Turton, SD: when does the frost end?
Typically, the last spring freeze lands around 05/07, roughly 252 days out. Fall's first freeze usually shows up around 10/03, roughly 149 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Turton 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 Turton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 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.
Turton against the rest of the dataset
Turton's growing season runs about 149 days, ranking 35,608 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 194 of 378.
Learn more
Before leaning on 57477's figures: local microclimates explains what one yard in Turton can differ from the 57477 normal, while zone vs. frost date explains why Zone 4b and Turton's frost date answer different questions.