Clark, SD 57225 Frost Dates
Clark, SD: when does the frost end?
Around 05/07 is the usual last spring frost, about 252 days away. 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 Clark 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 Clark's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Clark's last frost
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.
Clark against the rest of the dataset
Clark's growing season runs about 149 days, ranking 35,533 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 181 of 378.
Learn more
Before leaning on 57225's figures: zone vs. frost date explains why Zone 4b and Clark's frost date answer different questions, while the frost range explains how to read the range around Clark's dates instead of trusting one.