Mound City, SD 57646 Frost Dates
When can you plant in Mound City, SD?
The last spring frost here typically falls around 05/08, about 253 days from today. The first fall frost typically arrives around 10/01, about 145 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mound City in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 5 weeks of growing season left in Mound City before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Mound City's last frost
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mound City compares
At roughly 145 frost-free days, Mound City places 36,313 of 40,283 ZIP codes in this dataset. Within SD, it ranks 252 of 378.
Learn more
zone vs. frost date covers why Zone 4b and Mound City's frost date answer different questions. the frost range covers how to read the range around Mound City's dates instead of trusting one.