Dimock, SD 57331 Frost Dates
Dimock, SD: when does the frost end?
The last spring frost here typically falls around 04/27, about 242 days from today. Fall's first freeze usually shows up around 10/11, roughly 167 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Dimock in Zone 5a (-20 to -15°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 6 weeks until Dimock's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Dimock against the rest of the dataset
At roughly 167 frost-free days, Dimock places 30,221 of 40,283 ZIP codes in this dataset. Within SD, it ranks 6 of 378.
Learn more
Before leaning on 57331's figures: zone vs. frost date explains why Zone 5a and Dimock's frost date answer different questions, while the frost range explains how to read the range around Dimock's dates instead of trusting one.