Wentworth, SD 57075 Frost Dates
Wentworth, SD: when does the frost end?
Typically, the last spring freeze lands around 05/02, roughly 247 days out. Fall's first freeze usually shows up around 10/05, roughly 156 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Wentworth 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 Wentworth'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
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Wentworth against the rest of the dataset
At roughly 156 frost-free days, Wentworth places 33,862 of 40,283 ZIP codes in this dataset. Within SD, it ranks 90 of 378.
Learn more
Before leaning on 57075's figures: local microclimates explains what one yard in Wentworth can differ from the 57075 normal, while zone vs. frost date explains why Zone 4b and Wentworth's frost date answer different questions.