Sioux Falls, SD 57107 Frost Dates
Frost dates for Sioux Falls, SD, ZIP 57107
Typically, the last spring freeze lands around 05/01, roughly 246 days out. The first fall frost typically arrives around 10/06, about 157 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sioux Falls in Zone 5a (-20 to -15°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
Zone 5a around Sioux Falls has about 6 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/01 isn't a guarantee
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
At roughly 157 frost-free days, Sioux Falls places 33,188 of 40,283 ZIP codes in this dataset. Within SD, it ranks 62 of 378.
Learn more
zone vs. frost date explains why Zone 5a and Sioux Falls's frost date answer different questions, and the frost range explains how to read the range around Sioux Falls's dates instead of trusting one.