# Frost dates for Sioux Falls, SD (57197)

**Do this (Safe, 2026-11-02):** Frost season started Sep 28. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | May 9 | Sep 28 | 142 |
| Median | Apr 26 | Oct 13 | 170 |
| Bold (9 in 10 years later) | Apr 10 | Oct 28 | 201 |

Frost = 32°F. Station: Sioux Falls WFO AP, SD, 3 mi away.

## Next nights (NWS overnight low)

- 2026-11-01: 56°F — Go (tonight)
- 2026-11-02: 49°F — Go
- 2026-11-03: 41°F — Go
- 2026-11-04: 37°F — Wait
- 2026-11-05: 33°F — Cover
- 2026-11-06: 34°F — Cover
- 2026-11-07: 37°F — Wait

Go above 40°F · Wait 37–40°F · Cover 36°F or less · Freeze 28°F or less.

Source: Frost dates: NOAA NCEI U.S. Climate Normals 1991–2020, station Sioux Falls WFO AP, SD (3 mi, about your height). Not endorsed by NOAA. Nights: National Weather Service.

Page: https://frostdatecalculator.com/s/south-dakota · JSON: https://frostdatecalculator.com/s/south-dakota?format=json