Last Frost Date Sioux Falls: Frost Dates, Late Frost Risk & Growing Season

When is the last spring frost and the first autumn frost in Sioux Falls? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.

The frost season in Sioux Falls

Last frost (average): April 28
In 1 year out of 10 it still freezes on May 12.
First frost: October 8
Frost-free season: 162 days
Frost after 15 May: in 3 % of years

Frost days per month in Sioux Falls

January: 31 · -13 °C
February: 27.8 · -11 °C
March: 25.6 · -4 °C
April: 10.8 · 2 °C
May: 0.8 · 9 °C
June: 0 · 15 °C
July: 0 · 18 °C
August: 0 · 16 °C
September: 0.1 · 11 °C
October: 8.6 · 3 °C
November: 24.5 · -4 °C
December: 30.8 · -10 °C

Matched to the average lows of a weather station 9 km away – accurate to about ±1–2 weeks.
Daily minimum temperatures 2 m above ground over 30 years (1991–2020), NASA POWER; station data: Deutscher Wetterdienst (CC BY 4.0). Ground frost can form while the air at 2 m is still +2 to +3 °C.