Sunol, CA frost dates
Last spring frostFeb 15median date
First fall frostDec 2median date
Growing season290 daysfrost-free
Hardiness zone9bZone 9b
How Sunol compares
- In 8 years out of 10, the last spring frost in Sunol falls between January 12 and March 13, a 60-day window. The first fall frost falls between November 16 and December 28.
- The median last frost is 44 days earlier than the California median of Mar 31.
- Its 290-day growing season is longer than 91% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 5 days earlier 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 13 nights a year at or below 32°F.
- Sunol shares its weather station with Pleasanton, CA, 8 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 12 |
| 50% (median) | February 15 |
| 10% (safe for tender plants) | March 13 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 16 |
| 50% (median) | December 2 |
| 90% (late) | December 28 |
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 Sunol, CA
Sunol, CA frost dates — last frost Feb 15, first frost Dec 2, zone 9b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Nov 23 to Dec 7Transplant outside: Jan 18 to Feb 1
Start indoors: Dec 7 to Dec 21Transplant outside: Mar 1 to Mar 15
Start indoors: Dec 7 to Dec 21Transplant outside: Mar 1 to Mar 15
Start indoors: Dec 21 to Jan 4Start indoors: Dec 21 to Jan 4Transplant outside: Feb 22 to Mar 8
Start indoors: Dec 21 to Jan 4Start indoors: Dec 21 to Jan 4Transplant outside: Jan 25 to Feb 8Sow outdoors: Jan 18 to Feb 22Plant for fall: Oct 7 to Nov 4
Start indoors: Dec 21 to Jan 4Start indoors: Dec 21 to Jan 4Transplant outside: Jan 18 to Feb 1Sow outdoors: Jan 18 to Feb 1Plant for fall: Sep 23 to Oct 14
Start indoors: Dec 21 to Jan 4Start indoors: Dec 21 to Jan 4Transplant outside: Feb 1 to Feb 15Plant for fall: Aug 26 to Sep 16
Start indoors: Dec 21 to Jan 4Start indoors: Dec 21 to Jan 4Transplant outside: Jan 25 to Feb 8Plant for fall: Aug 26 to Sep 16
Start indoors: Dec 21 to Jan 4Start indoors: Dec 21 to Jan 4Transplant outside: Feb 1 to Feb 15Plant for fall: Aug 26 to Sep 16
Start indoors: Jan 4 to Jan 18Transplant outside: Mar 8 to Mar 22Sow outdoors: Mar 8 to Mar 22
Start indoors: Jan 4 to Jan 18Transplant outside: Feb 22 to Mar 8
Sow outdoors: Jan 4 to Jan 25Plant for fall: Sep 9 to Sep 30
Sow outdoors: Jan 4 to Jan 25Plant for fall: Oct 7 to Oct 28
Sow outdoors: Jan 11 to Feb 22Plant for fall: Oct 21 to Nov 11
Start indoors: Jan 18 to Jan 25Transplant outside: Mar 1 to Mar 8Sow outdoors: Feb 22 to Mar 8Plant for fall: Sep 16 to Sep 30
Start indoors: Jan 18 to Jan 25Sow outdoors: Feb 22 to Mar 8Plant for fall: Sep 23 to Oct 7
Start indoors: Jan 18 to Jan 25Sow outdoors: Feb 22 to Mar 8
Start indoors: Jan 18 to Jan 25Transplant outside: Mar 1 to Mar 15
Sow outdoors: Jan 25 to Feb 22Plant for fall: Sep 9 to Sep 23
Sow outdoors: Jan 25 to Feb 22Plant for fall: Sep 23 to Oct 7
Sow outdoors: Jan 25 to Feb 15
Sow outdoors: Feb 1 to Mar 1Plant for fall: Sep 23 to Oct 7
Sow outdoors: Feb 1 to Feb 22Plant for fall: Oct 7 to Oct 28
Sow outdoors: Feb 22 to Mar 15Plant for fall: Sep 16 to Sep 30
Sow outdoors: Feb 22 to Mar 8
Transplant outside: Mar 1 to Mar 22
Plant for fall: Nov 18 to Dec 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Sunol, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 23 – Dec 7 | Jan 18 – Feb 1 | — | — |
| Peppers | Dec 7 – Dec 21 | Mar 1 – Mar 15 | — | — |
| Eggplant | Dec 7 – Dec 21 | Mar 1 – Mar 15 | — | — |
| Tomatoes | Dec 21 – Jan 4 | Feb 22 – Mar 8 | — | — |
| Lettuce | Dec 21 – Jan 4 | Jan 25 – Feb 8 | Jan 18 – Feb 22 | Oct 7 – Nov 4 |
| Kale | Dec 21 – Jan 4 | Jan 18 – Feb 1 | Jan 18 – Feb 1 | Sep 23 – Oct 14 |
| Broccoli | Dec 21 – Jan 4 | Feb 1 – Feb 15 | — | Aug 26 – Sep 16 |
| Cabbage | Dec 21 – Jan 4 | Jan 25 – Feb 8 | — | Aug 26 – Sep 16 |
| Cauliflower | Dec 21 – Jan 4 | Feb 1 – Feb 15 | — | Aug 26 – Sep 16 |
| Okra | Jan 4 – Jan 18 | Mar 8 – Mar 22 | Mar 8 – Mar 22 | — |
| Basil | Jan 4 – Jan 18 | Feb 22 – Mar 8 | — | — |
| Peas | — | — | Jan 4 – Jan 25 | Sep 9 – Sep 30 |
| Spinach | — | — | Jan 4 – Jan 25 | Oct 7 – Oct 28 |
| Radishes | — | — | Jan 11 – Feb 22 | Oct 21 – Nov 11 |
| Cucumbers | Jan 18 – Jan 25 | Mar 1 – Mar 8 | Feb 22 – Mar 8 | Sep 16 – Sep 30 |
| Zucchini & Summer Squash | Jan 18 – Jan 25 | — | Feb 22 – Mar 8 | Sep 23 – Oct 7 |
| Winter Squash & Pumpkins | Jan 18 – Jan 25 | — | Feb 22 – Mar 8 | — |
| Melons & Watermelon | Jan 18 – Jan 25 | Mar 1 – Mar 15 | — | — |
| Carrots | — | — | Jan 25 – Feb 22 | Sep 9 – Sep 23 |
| Beets | — | — | Jan 25 – Feb 22 | Sep 23 – Oct 7 |
| Potatoes | — | — | Jan 25 – Feb 15 | — |
| Swiss Chard | — | — | Feb 1 – Mar 1 | Sep 23 – Oct 7 |
| Cilantro | — | — | Feb 1 – Feb 22 | Oct 7 – Oct 28 |
| Green Beans | — | — | Feb 22 – Mar 15 | Sep 16 – Sep 30 |
| Sweet Corn | — | — | Feb 22 – Mar 8 | — |
| Sweet Potatoes | — | Mar 1 – Mar 22 | — | — |
| Garlic | — | — | — | Nov 18 – Dec 23 |
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 Livermore, CA weather station, 12 km away (elevation 394 ft (120 m)).
Frost dates near Sunol
- Pleasanton Feb 15 · Dec 2
- Fremont Jan 7 · Dec 22
- Dublin Feb 15 · Dec 2
- Hayward Jan 2 · Dec 25
- Union City Jan 7 · Dec 22
- Newark Jan 7 · Dec 22
- Livermore Feb 15 · Dec 2
- San Ramon Feb 15 · Dec 2
- Castro Valley Jan 2 · Dec 25
- Milpitas Jan 12 · Dec 22
Frequently asked questions
When is the last frost in Sunol, CA?
The median last spring frost in Sunol, CA is February 15. 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 Sunol, CA?
The median first fall frost is December 2, with about a 10% chance of frost before November 16.
How long is the growing season in Sunol, CA?
About 290 days between the median last spring frost and first fall frost.
What planting zone is Sunol, CA?
Sunol, CA is in USDA hardiness zone 9b.