Sioux Falls, SD 57101 Frost Dates
When can you plant in Sioux Falls, SD?
Around 05/01 is the usual last spring frost, about 246 days away. The first fall frost typically arrives around 10/06, about 157 frost-free days later.
Sioux Falls sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 6 weeks of growing season left in Sioux Falls before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Sioux Falls's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sioux Falls compares
Sioux Falls's growing season runs about 157 days, ranking 33,183 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 57 of 378.
Learn more
zone vs. frost date covers why Zone 5a and Sioux Falls's frost date answer different questions. the frost range covers how to read the range around Sioux Falls's dates instead of trusting one.