Frost dates · South Dakota
When is the first frost in Sioux Falls?
In a typical year, Sioux Falls’s first frost comes around October 6 and its last around May 1.
One year in ten the first frost comes as early as September 23, and nine years in ten it has arrived by October 20. One year in ten the last frost is over as early as April 18, and nine years in ten it is over by May 14. Sioux Falls averages about 162 nights a year at 32°F or colder, with about 157 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around May 1. That makes it the 16th earliest first frost of the 117 cities we track where it freezes most years.
Last updated
A freeze is in the forecast for the next 48 hours.
Sioux Falls frosts from early October to May, and the prairie spends the gap trying very hard to look green.
Live 48-hour check from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Frost dates, early, typical and late years
| Early year (1 in 10) | Typical | Late year (1 in 10) | |
|---|---|---|---|
| First frost | September 23 | October 6 | October 20 |
| Last frost | April 18 | May 1 | May 14 |
A frost date here is a night when the official thermometer reads 32°F or colder. Frost on the ground can show up on clear, calm nights a few degrees milder.
Cities with about the same first frost
- Billings, Montana: first frost around October 7
- Sioux City, Iowa: first frost around October 5
- Yakima, Washington: first frost around October 4
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014944.