Last frost date in Simi Valley, California
January 24
Average last frost in spring. In an early year (1 in 10) it's over by December 21; in a late year (1 in 10) it comes after March 5.
December 15
Average first frost in fall. 1 year in 10 it comes by November 27.
A 32°F night happens here about 9 years in 10; in those years these are the usual dates.
Source: NOAA U.S. Climate Normals 1991–2020, station Woodland Hills Pierce College (USC00049785), 11.5 miles from Simi Valley, elevation 790 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Agoura Hills and Calabasas, so their frost dates are the same as Simi Valley's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Dec 21 | Jan 24 | Mar 5 |
| First frost in fall | Nov 27 | Dec 15 | Jan 26 |
Frost-free days in an average year: 329
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Mar 2 | Nov 29 |
| Frost (32°F) | 9 years in 10 | Jan 24 | Dec 15 |
| Hard freeze (28°F) | 3 years in 10 | Dec 31 | Dec 26 |
Nights at 32°F or colder in an average year: 11
What to plant now in Simi Valley
- Swiss chardJune 1 – Dec 1Now
- Broccoli plantsAug 1 – Nov 1Now
- Brussels sprouts plantsAug 1 – Nov 1Now
- BeetsSept 1 – Dec 31Now
- Cabbage plantsSept 1 – Dec 31Now
- Celery and celeriac plantsSept 1 – Dec 31Now
- Chinese cabbageSept 1 – Nov 15Now
- Collards plantsSept 1 – Dec 31Now
- EndiveSept 1 – Dec 31Now
- Florence fennelSept 1 – Dec 1Now
- KaleSept 1 – Dec 31Now
- LeeksSept 1 – Nov 1Now
- Mustard greensSept 1 – Dec 1Now
- Onion seedSept 1 – Nov 1Now
- ParsnipsSept 1 – Dec 1Now
- SorrelSept 1 – Dec 15Now
- CarrotsSept 15 – Dec 1Now
- GarlicSept 15 – Nov 15Now
- Head lettuce plantsSept 15 – Dec 31Now
- KohlrabiSept 15 – Dec 31Now
- Leaf lettuceSept 15 – Dec 31Now
- ParsleySept 15 – Dec 31Now
- ShallotsSept 15 – Nov 1Now
- Corn saladOct 1 – Dec 31Now
- DandelionOct 1 – Dec 31Now
- Garden peasOct 1 – Dec 31Now
- Onion plants plantsOct 1 – Dec 31Now
- RutabagaOct 1 – Nov 15Now
- SpinachOct 1 – Dec 31Now
- TurnipsOct 1 – Dec 1Now
- Upland cressOct 1 – Dec 31Now
- Chervil and chivesNov 1 – Dec 31Soon
- Onion setsNov 1 – Dec 31Soon
- Spring planting calendar for an average last frost around January 30 Simi Valley: January 24
- Fall planting calendar for an average first frost around December 10 Simi Valley: December 15
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in California
- Santa Clarita 18 mi · last frost Jan 8
- San Fernando 18 mi · last frost Jan 2
- Santa Monica 23 mi · frost rare
- Los Angeles 26 mi · frost rare
- Oxnard 27 mi · last frost Dec 31