Oakville, CA frost dates
Last spring frostFeb 3median date
First fall frostDec 4median date
Growing season304 daysfrost-free
Hardiness zone9bZone 9b
Frost is light and occasional here — typically a few cold nights around midwinter (about 14 a year). Cover tender plants when frost is forecast.
How Oakville compares
- In a typical year, frost nights in Oakville fall between December 4 and February 3. In 1 year in 10 the first frost comes as early as November 14, or the last frost as late as March 13.
- Nearby Napa, CA, 15 km away, has a regular frost season (last frost Feb 12), a reminder of how much elevation and distance from the coast matter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | December 28 |
| 50% (median) | February 3 |
| 10% (safe for tender plants) | March 13 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 14 |
| 50% (median) | December 4 |
| 90% (late) | January 1 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Oakville, CA
Oakville, CA frost dates — last frost Feb 3, first frost Dec 4, zone 9b. whenisthelastfrost.com
In mild climates, summer heat limits many crops as much as frost does. Use this calendar for spring planting and lean on fall and winter for cool-season crops.
Crop
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Start indoors: Nov 11 to Nov 25Transplant outside: Jan 6 to Jan 20
Start indoors: Nov 25 to Dec 9Transplant outside: Feb 17 to Mar 3
Start indoors: Nov 25 to Dec 9Transplant outside: Feb 17 to Mar 3
Start indoors: Dec 9 to Dec 23Transplant outside: Feb 10 to Feb 24
Start indoors: Dec 9 to Dec 23Transplant outside: Jan 13 to Jan 27Sow outdoors: Jan 6 to Feb 10Plant for fall: Oct 9 to Nov 6
Start indoors: Dec 9 to Dec 23Transplant outside: Jan 6 to Jan 20Sow outdoors: Jan 6 to Jan 20Plant for fall: Sep 25 to Oct 16
Start indoors: Dec 9 to Dec 23Transplant outside: Jan 20 to Feb 3Plant for fall: Aug 28 to Sep 18
Start indoors: Dec 9 to Dec 23Transplant outside: Jan 13 to Jan 27Plant for fall: Aug 28 to Sep 18
Start indoors: Dec 9 to Dec 23Transplant outside: Jan 20 to Feb 3Plant for fall: Aug 28 to Sep 18
Start indoors: Dec 23 to Jan 6Start indoors: Dec 23 to Jan 6Transplant outside: Feb 24 to Mar 10Sow outdoors: Feb 24 to Mar 10
Start indoors: Dec 23 to Jan 6Start indoors: Dec 23 to Jan 6Transplant outside: Feb 10 to Feb 24
Sow outdoors: Dec 23 to Jan 13Sow outdoors: Dec 23 to Jan 13Plant for fall: Sep 11 to Oct 2
Sow outdoors: Dec 23 to Jan 13Sow outdoors: Dec 23 to Jan 13Plant for fall: Oct 9 to Oct 30
Sow outdoors: Dec 30 to Feb 10Sow outdoors: Dec 30 to Feb 10Plant for fall: Oct 23 to Nov 13
Start indoors: Jan 6 to Jan 13Transplant outside: Feb 17 to Feb 24Sow outdoors: Feb 10 to Feb 24Plant for fall: Sep 18 to Oct 2
Start indoors: Jan 6 to Jan 13Sow outdoors: Feb 10 to Feb 24Plant for fall: Sep 25 to Oct 9
Start indoors: Jan 6 to Jan 13Sow outdoors: Feb 10 to Feb 24
Start indoors: Jan 6 to Jan 13Transplant outside: Feb 17 to Mar 3
Sow outdoors: Jan 13 to Feb 10Plant for fall: Sep 11 to Sep 25
Sow outdoors: Jan 13 to Feb 10Plant for fall: Sep 25 to Oct 9
Sow outdoors: Jan 13 to Feb 3
Sow outdoors: Jan 20 to Feb 17Plant for fall: Sep 25 to Oct 9
Sow outdoors: Jan 20 to Feb 10Plant for fall: Oct 9 to Oct 30
Sow outdoors: Feb 10 to Mar 3Plant for fall: Sep 18 to Oct 2
Sow outdoors: Feb 10 to Feb 24
Transplant outside: Feb 17 to Mar 10
Plant for fall: Nov 20 to Dec 25
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Oakville, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 11 – Nov 25 | Jan 6 – Jan 20 | — | — |
| Peppers | Nov 25 – Dec 9 | Feb 17 – Mar 3 | — | — |
| Eggplant | Nov 25 – Dec 9 | Feb 17 – Mar 3 | — | — |
| Tomatoes | Dec 9 – Dec 23 | Feb 10 – Feb 24 | — | — |
| Lettuce | Dec 9 – Dec 23 | Jan 13 – Jan 27 | Jan 6 – Feb 10 | Oct 9 – Nov 6 |
| Kale | Dec 9 – Dec 23 | Jan 6 – Jan 20 | Jan 6 – Jan 20 | Sep 25 – Oct 16 |
| Broccoli | Dec 9 – Dec 23 | Jan 20 – Feb 3 | — | Aug 28 – Sep 18 |
| Cabbage | Dec 9 – Dec 23 | Jan 13 – Jan 27 | — | Aug 28 – Sep 18 |
| Cauliflower | Dec 9 – Dec 23 | Jan 20 – Feb 3 | — | Aug 28 – Sep 18 |
| Okra | Dec 23 – Jan 6 | Feb 24 – Mar 10 | Feb 24 – Mar 10 | — |
| Basil | Dec 23 – Jan 6 | Feb 10 – Feb 24 | — | — |
| Peas | — | — | Dec 23 – Jan 13 | Sep 11 – Oct 2 |
| Spinach | — | — | Dec 23 – Jan 13 | Oct 9 – Oct 30 |
| Radishes | — | — | Dec 30 – Feb 10 | Oct 23 – Nov 13 |
| Cucumbers | Jan 6 – Jan 13 | Feb 17 – Feb 24 | Feb 10 – Feb 24 | Sep 18 – Oct 2 |
| Zucchini & Summer Squash | Jan 6 – Jan 13 | — | Feb 10 – Feb 24 | Sep 25 – Oct 9 |
| Winter Squash & Pumpkins | Jan 6 – Jan 13 | — | Feb 10 – Feb 24 | — |
| Melons & Watermelon | Jan 6 – Jan 13 | Feb 17 – Mar 3 | — | — |
| Carrots | — | — | Jan 13 – Feb 10 | Sep 11 – Sep 25 |
| Beets | — | — | Jan 13 – Feb 10 | Sep 25 – Oct 9 |
| Potatoes | — | — | Jan 13 – Feb 3 | — |
| Swiss Chard | — | — | Jan 20 – Feb 17 | Sep 25 – Oct 9 |
| Cilantro | — | — | Jan 20 – Feb 10 | Oct 9 – Oct 30 |
| Green Beans | — | — | Feb 10 – Mar 3 | Sep 18 – Oct 2 |
| Sweet Corn | — | — | Feb 10 – Feb 24 | — |
| Sweet Potatoes | — | Feb 17 – Mar 10 | — | — |
| Garlic | — | — | — | Nov 20 – Dec 25 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Saint Helena, CA weather station, 10 km away (elevation 226 ft (69 m)).
Frost dates near Oakville
- Rutherford Feb 3 · Dec 4
- Yountville Mar 2 · Nov 27
- Saint Helena Feb 3 · Dec 4
- Glen Ellen Mar 2 · Nov 27
- Kenwood Feb 3 · Dec 4
- Eldridge Mar 2 · Nov 27
- Deer Park Apr 7 · Dec 5
- Napa Feb 12 · Dec 4
- Boyes Hot Springs Mar 2 · Nov 27
- Angwin Apr 7 · Dec 5
Frequently asked questions
When is the last frost in Oakville, CA?
The median last spring frost in Oakville, CA is February 3. There is still about a 10% chance of frost after March 13, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Oakville, CA?
The median first fall frost is December 4, with about a 10% chance of frost before November 14.
How long is the growing season in Oakville, CA?
About 304 days between the median last spring frost and first fall frost.
What planting zone is Oakville, CA?
Oakville, CA is in USDA hardiness zone 9b.