# Frost dates for Watertown, SD (57201)

**Do this (Safe, 2026-11-02):** Frost season started Sep 19. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | May 20 | Sep 19 | 122 |
| Median | May 7 | Sep 30 | 146 |
| Bold (9 in 10 years later) | Apr 26 | Oct 13 | 170 |

Frost = 32°F. Station: Watertown Rgnl AP, SD, 0 mi away.

## Next nights (NWS overnight low)

- 2026-11-02: 43°F — Go (tonight)
- 2026-11-03: 37°F — Wait
- 2026-11-04: 33°F — Cover
- 2026-11-05: 29°F — Cover
- 2026-11-06: 32°F — Cover
- 2026-11-07: 33°F — Cover
- 2026-11-08: 33°F — Cover

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 Watertown Rgnl AP, SD (0 mi, about your height). Not endorsed by NOAA. Nights: National Weather Service.

Page: https://frostdatecalculator.com/p/sd/watertown · JSON: https://frostdatecalculator.com/p/sd/watertown?format=json