Sioux Falls, SD 57105 Frost Dates
When can you plant in Sioux Falls, SD?
The last spring frost here typically falls around 05/01, about 246 days from today. 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
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.
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
About 157 days separate Sioux Falls's last and first frost, putting it 33,186 of 40,283 ZIP codes nationally. Within SD, it ranks 60 of 378.
Learn more
local microclimates covers what one yard in Sioux Falls can differ from the 57105 normal. zone vs. frost date covers why Zone 5a and Sioux Falls's frost date answer different questions.