# Frost dates for San Luis Obispo, CA (93401)

**Do this (Safe, 2026-11-02):** 18 days until first frost (Nov 20). Tender plants OK outdoors.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | Mar 7 | Nov 20 | 258 |
| Median | Jan 31 | Dec 11 | 314 |
| Bold (9 in 10 years later) | Dec 23 | Jan 13 | -344 |

Frost = 32°F. Station: San Luis Obispo AP, CA, 3 mi away.

## Next nights (NWS overnight low)

- 2026-11-01: 52°F — Go (tonight)
- 2026-11-02: 53°F — Go
- 2026-11-03: 52°F — Go
- 2026-11-04: 54°F — Go
- 2026-11-05: 53°F — Go
- 2026-11-06: 54°F — Go
- 2026-11-07: 56°F — Go

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 San Luis Obispo AP, CA (3 mi, 62 ft lower than you). Not endorsed by NOAA. Nights: National Weather Service.

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