Frost dates for 94589 — Vallejo, CA
Last spring frostMar 5median date
First fall frostNov 21median date
Growing season261 daysfrost-free
Hardiness zone9bZone 9b
How Vallejo compares
- In 8 years out of 10, the last spring frost in Vallejo falls between January 26 and April 16, a 80-day window. The first fall frost falls between November 3 and December 13.
- The median last frost is 26 days earlier than the California median of Mar 31.
- Its 261-day growing season is longer than 59% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 13 days later than the zone 9b median of Feb 20. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9b chart.
- The weather station records an average of 34 nights a year at or below 32°F.
- Nearby Concord, CA, 31 km away, gets only light, occasional frost, a reminder of how much elevation and distance from the coast matter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 26 |
| 50% (median) | March 5 |
| 10% (safe for tender plants) | April 16 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 3 |
| 50% (median) | November 21 |
| 90% (late) | December 13 |
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 Vallejo, CA
Frost dates for 94589 — Vallejo, CA — last frost Mar 5, first frost Nov 21, zone 9b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 11 to Dec 25Transplant outside: Feb 5 to Feb 19
Start indoors: Dec 25 to Jan 8Start indoors: Dec 25 to Jan 8Transplant outside: Mar 19 to Apr 2
Start indoors: Dec 25 to Jan 8Start indoors: Dec 25 to Jan 8Transplant outside: Mar 19 to Apr 2
Start indoors: Jan 8 to Jan 22Transplant outside: Mar 12 to Mar 26
Start indoors: Jan 8 to Jan 22Transplant outside: Feb 12 to Feb 26Sow outdoors: Feb 5 to Mar 12Plant for fall: Sep 26 to Oct 24
Start indoors: Jan 8 to Jan 22Transplant outside: Feb 5 to Feb 19Sow outdoors: Feb 5 to Feb 19Plant for fall: Sep 12 to Oct 3
Start indoors: Jan 8 to Jan 22Transplant outside: Feb 19 to Mar 5Plant for fall: Aug 15 to Sep 5
Start indoors: Jan 8 to Jan 22Transplant outside: Feb 12 to Feb 26Plant for fall: Aug 15 to Sep 5
Start indoors: Jan 8 to Jan 22Transplant outside: Feb 19 to Mar 5Plant for fall: Aug 15 to Sep 5
Start indoors: Jan 22 to Feb 5Transplant outside: Mar 26 to Apr 9Sow outdoors: Mar 26 to Apr 9
Start indoors: Jan 22 to Feb 5Transplant outside: Mar 12 to Mar 26
Sow outdoors: Jan 22 to Feb 12Plant for fall: Aug 29 to Sep 19
Sow outdoors: Jan 22 to Feb 12Plant for fall: Sep 26 to Oct 17
Sow outdoors: Jan 29 to Mar 12Plant for fall: Oct 10 to Oct 31
Start indoors: Feb 5 to Feb 12Transplant outside: Mar 19 to Mar 26Sow outdoors: Mar 12 to Mar 26Plant for fall: Sep 5 to Sep 19
Start indoors: Feb 5 to Feb 12Sow outdoors: Mar 12 to Mar 26Plant for fall: Sep 12 to Sep 26
Start indoors: Feb 5 to Feb 12Sow outdoors: Mar 12 to Mar 26
Start indoors: Feb 5 to Feb 12Transplant outside: Mar 19 to Apr 2
Sow outdoors: Feb 12 to Mar 12Plant for fall: Aug 29 to Sep 12
Sow outdoors: Feb 12 to Mar 12Plant for fall: Sep 12 to Sep 26
Sow outdoors: Feb 12 to Mar 5
Sow outdoors: Feb 19 to Mar 19Plant for fall: Sep 12 to Sep 26
Sow outdoors: Feb 19 to Mar 12Plant for fall: Sep 26 to Oct 17
Sow outdoors: Mar 12 to Apr 2Plant for fall: Sep 5 to Sep 19
Sow outdoors: Mar 12 to Mar 26
Transplant outside: Mar 19 to Apr 9
Plant for fall: Nov 7 to Dec 12
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Vallejo, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 11 – Dec 25 | Feb 5 – Feb 19 | — | — |
| Peppers | Dec 25 – Jan 8 | Mar 19 – Apr 2 | — | — |
| Eggplant | Dec 25 – Jan 8 | Mar 19 – Apr 2 | — | — |
| Tomatoes | Jan 8 – Jan 22 | Mar 12 – Mar 26 | — | — |
| Lettuce | Jan 8 – Jan 22 | Feb 12 – Feb 26 | Feb 5 – Mar 12 | Sep 26 – Oct 24 |
| Kale | Jan 8 – Jan 22 | Feb 5 – Feb 19 | Feb 5 – Feb 19 | Sep 12 – Oct 3 |
| Broccoli | Jan 8 – Jan 22 | Feb 19 – Mar 5 | — | Aug 15 – Sep 5 |
| Cabbage | Jan 8 – Jan 22 | Feb 12 – Feb 26 | — | Aug 15 – Sep 5 |
| Cauliflower | Jan 8 – Jan 22 | Feb 19 – Mar 5 | — | Aug 15 – Sep 5 |
| Okra | Jan 22 – Feb 5 | Mar 26 – Apr 9 | Mar 26 – Apr 9 | — |
| Basil | Jan 22 – Feb 5 | Mar 12 – Mar 26 | — | — |
| Peas | — | — | Jan 22 – Feb 12 | Aug 29 – Sep 19 |
| Spinach | — | — | Jan 22 – Feb 12 | Sep 26 – Oct 17 |
| Radishes | — | — | Jan 29 – Mar 12 | Oct 10 – Oct 31 |
| Cucumbers | Feb 5 – Feb 12 | Mar 19 – Mar 26 | Mar 12 – Mar 26 | Sep 5 – Sep 19 |
| Zucchini & Summer Squash | Feb 5 – Feb 12 | — | Mar 12 – Mar 26 | Sep 12 – Sep 26 |
| Winter Squash & Pumpkins | Feb 5 – Feb 12 | — | Mar 12 – Mar 26 | — |
| Melons & Watermelon | Feb 5 – Feb 12 | Mar 19 – Apr 2 | — | — |
| Carrots | — | — | Feb 12 – Mar 12 | Aug 29 – Sep 12 |
| Beets | — | — | Feb 12 – Mar 12 | Sep 12 – Sep 26 |
| Potatoes | — | — | Feb 12 – Mar 5 | — |
| Swiss Chard | — | — | Feb 19 – Mar 19 | Sep 12 – Sep 26 |
| Cilantro | — | — | Feb 19 – Mar 12 | Sep 26 – Oct 17 |
| Green Beans | — | — | Mar 12 – Apr 2 | Sep 5 – Sep 19 |
| Sweet Corn | — | — | Mar 12 – Mar 26 | — |
| Sweet Potatoes | — | Mar 19 – Apr 9 | — | — |
| Garlic | — | — | — | Nov 7 – Dec 12 |
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 Napa Co Ap, CA weather station, 6 km away (elevation 13 ft (4 m)).
ZIP codes in Vallejo: 94589 94590 94591 94592
Frost dates near Vallejo
- American Canyon Mar 5 · Nov 21
- Crockett Jan 17 · Dec 27
- Rodeo Jan 17 · Dec 27
- Benicia Jan 17 · Dec 27
- Port Costa Jan 17 · Dec 27
- Hercules Jan 17 · Dec 27
- Pinole Jan 4 · Jan 2
- Vineburg Mar 2 · Nov 27
Frequently asked questions
When is the last frost in Vallejo, CA?
The median last spring frost in Vallejo, CA is March 5. There is still about a 10% chance of frost after April 16, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Vallejo, CA?
The median first fall frost is November 21, with about a 10% chance of frost before November 3.
How long is the growing season in Vallejo, CA?
About 261 days between the median last spring frost and first fall frost.
What planting zone is Vallejo, CA?
Vallejo, CA is in USDA hardiness zone 9b.