Last frost date in Napa, California
February 12
Average last frost in spring. In an early year (1 in 10) it's over by January 3; in a late year (1 in 10) it comes after March 13.
December 4
Average first frost in fall. 1 year in 10 it comes by November 15.
A 32°F night happens here about 10 years in 10; in those years these are the usual dates.
Source: NOAA U.S. Climate Normals 1991–2020, station Napa State Hospital (USC00046074), 2.4 miles from Napa, elevation 35 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Jan 3 | Feb 12 | Mar 13 |
| First frost in fall | Nov 15 | Dec 4 | Jan 4 |
An early or late year is one in 10: 1 year in 10 the frost comes before the early date, and 1 year in 10 after the late date.
Frost-free days in an average year: 299
Planting calendar for Napa
Fall planting
USDA dates for places whose average first freeze is about November 30 (Napa: December 4).
- OkraJune 1 – Sept 20 (past for this year)
- SoybeansJune 1 – July 30 (past for this year)
- Summer squashJune 1 – Sept 1 (past for this year)
- Sweet potatoesJune 1 – July 1 (past for this year)
- Swiss chardJune 1 – Nov 1Now
- Peppers plantsJune 15 – Sept 1 (past for this year)
- Black-eyed peasJuly 1 – Sept 10 (past for this year)
- Eggplant plantsJuly 1 – Sept 1 (past for this year)
- CucumbersJuly 15 – Sept 15 (past for this year)
- Winter squashJuly 15 – Aug 15 (past for this year)
- Broccoli plantsAug 1 – Oct 1 (past for this year)
- Brussels sprouts plantsAug 1 – Oct 1 (past for this year)
- Celery and celeriac plantsAug 1 – Dec 1Now
- Lima beansAug 1 – Sept 15 (past for this year)
- PotatoesAug 1 – Sept 15 (past for this year)
- TomatoesAug 1 – Sept 1 (past for this year)
- Cauliflower plantsAug 15 – Oct 10 (past for this year)
- SalsifyAug 15 – Sept 30 (past for this year)
- ShallotsAug 15 – Oct 15 (past for this year)
- Snap beansAug 15 – Sept 20 (past for this year)
- Witloof chicoryAug 15 – Sept 30 (past for this year)
- BeetsSept 1 – Dec 15Now
- Cabbage plantsSept 1 – Dec 31Now
- Chinese cabbageSept 1 – Nov 1Now
- Collards plantsSept 1 – Dec 1Now
- EndiveSept 1 – Nov 15Now
- Florence fennelSept 1 – Nov 15Now
- GarlicSept 1 – Nov 15Now
- Head lettuce plantsSept 1 – Dec 1Now
- KaleSept 1 – Dec 1Now
- KohlrabiSept 1 – Dec 1Now
- Leaf lettuceSept 1 – Dec 1Now
- LeeksSept 1 – Nov 1Now
- Mustard greensSept 1 – Dec 1Now
- Onion seedSept 1 – Nov 1Now
- ParsleySept 1 – Dec 31Now
- ParsnipsSept 1 – Nov 15Now
- RadishesSept 1 – Dec 31Now
- RutabagaSept 1 – Nov 15Now
- SorrelSept 1 – Nov 15Now
- TurnipsSept 1 – Nov 15Now
- CarrotsSept 15 – Dec 1Now
- DandelionSept 15 – Dec 15Now
- Corn saladOct 1 – Dec 31Now
- Garden peasOct 1 – Dec 31Now
- Onion plants plantsOct 1 – Dec 31Now
- SpinachOct 1 – Dec 31Now
- Upland cressOct 1 – Dec 31Now
- Chervil and chivesNov 1 – Dec 31Soon
- Onion setsNov 1 – Dec 31Soon
USDA lists horseradish as generally spring-planted here.
Spring planting
USDA dates for places whose average last freeze is about February 8 (Napa: February 12).
- Broccoli plantsJan 1 – 30
- Brussels sprouts plantsJan 1 – 30
- Cabbage plantsJan 1 – Feb 10
- CarrotsJan 1 – Mar 1
- Cauliflower plantsJan 1 – Feb 1
- Chervil and chivesJan 1 – Feb 1
- Collards plantsJan 1 – Feb 15
- Corn saladJan 1 – Feb 15
- DandelionJan 1 – Feb 1
- EndiveJan 1 – Mar 1
- Florence fennelJan 1 – Mar 1
- Garden peasJan 1 – Feb 15
- Head lettuce plantsJan 1 – Feb 1
- Leaf lettuceJan 1 – Feb 1
- LeeksJan 1 – Feb 1
- Mustard greensJan 1 – Mar 1
- Onion plants plantsJan 1 – 15
- Onion seedJan 1 – 15
- Onion setsJan 1 – 15
- ParsleyJan 1 – 30
- PotatoesJan 1 – Feb 15
- RadishesJan 1 – Apr 1
- ShallotsJan 1 – Feb 10
- SorrelJan 1 – Mar 1
- SpinachJan 1 – Feb 15
- TurnipsJan 1 – Mar 1
- Upland cressJan 1 – Feb 15
- BeetsJan 10 – Mar 15
- Celery and celeriac plantsJan 10 – Feb 10
- KaleJan 10 – Feb 1
- KohlrabiJan 10 – Feb 1
- SalsifyJan 10 – Feb 10
- Swiss chardJan 10 – Apr 1
- Snap beansFeb 1 – May 1
- Eggplant plantsFeb 10 – Mar 15
- Lima beansFeb 10 – May 1
- Sweet cornFeb 10 – Apr 1
- Black-eyed peasFeb 15 – May 15
- Cantaloupe (muskmelon)Feb 15 – Apr 1
- CucumbersFeb 15 – Apr 1
- New Zealand spinachFeb 15 – Apr 15
- OkraFeb 15 – Apr 15
- Peppers plantsFeb 15 – Apr 15
- Summer squashFeb 15 – Apr 15
- WatermelonFeb 15 – Apr 1
- TomatoesFeb 20 – Apr 10
- SoybeansMar 1 – June 30
- Sweet potatoesMar 1 – May 15
USDA lists chinese cabbage, garlic as generally fall-planted here.
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5 (earliest safe spring and latest safe fall dates), applied to this place's NOAA frost dates. “Plants” means setting out transplants, not sowing seed. How we match the table.
Nearby in California
- American Canyon 9 mi · last frost Mar 5
- Sonoma 9 mi · last frost Mar 2
- Vallejo 13 mi · last frost Jan 17
- Fairfield 15 mi · last frost Jan 15
- Suisun City 16 mi · last frost Jan 15