# Frost dates for San Ramon, CA (94582)

**Do this (Safe, 2026-11-02):** 21 days until first frost (Nov 23). Tender plants OK outdoors.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | Apr 15 | Nov 23 | 222 |
| Median | Mar 8 | Dec 22 | 289 |
| Bold (9 in 10 years later) | Jan 12 | Feb 11 | 30 |

Frost = 32°F. Station: Mt Diablo Junction, CA, 8 mi away.

## Next nights (NWS overnight low)

- 2026-11-01: 44°F — Go (tonight)
- 2026-11-02: 46°F — Go
- 2026-11-03: 46°F — Go
- 2026-11-04: 46°F — Go
- 2026-11-05: 46°F — Go
- 2026-11-06: 49°F — Go
- 2026-11-07: 49°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 Mt Diablo Junction, CA (8 mi, 1,667 ft higher than you). Not endorsed by NOAA. Nights: National Weather Service.

Page: https://frostdatecalculator.com/p/ca/san-ramon · JSON: https://frostdatecalculator.com/p/ca/san-ramon?format=json