Stonyford, CA frost dates
Last spring frostApr 6median date
First fall frostNov 10median date
Growing season218 daysfrost-free
Hardiness zone9aZone 9a
How Stonyford compares
- In 8 years out of 10, the last spring frost in Stonyford falls between March 6 and April 25, a 50-day window. The first fall frost falls between October 27 and November 23.
- The median last frost is 6 days later than the California median of Mar 31.
- Its 218-day growing season is longer than 43% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 34 days later than the zone 9a median of Mar 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9a chart.
- The weather station records an average of 60 nights a year at or below 32°F.
- Compared with Chico, CA, 76 km away, the last frost here is 33 days later than there and the growing season is 40 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 6 |
| 50% (median) | April 6 |
| 10% (safe for tender plants) | April 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 27 |
| 50% (median) | November 10 |
| 90% (late) | November 23 |
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 Stonyford, CA
Stonyford, CA frost dates — last frost Apr 6, first frost Nov 10, zone 9a. whenisthelastfrost.com
Crop
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Start indoors: Jan 12 to Jan 26Transplant outside: Mar 9 to Mar 23
Start indoors: Jan 26 to Feb 9Transplant outside: Apr 20 to May 4
Start indoors: Jan 26 to Feb 9Transplant outside: Apr 20 to May 4
Start indoors: Feb 9 to Feb 23Transplant outside: Apr 13 to Apr 27
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 16 to Mar 30Sow outdoors: Mar 9 to Apr 13Plant for fall: Sep 15 to Oct 13
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 9 to Mar 23Sow outdoors: Mar 9 to Mar 23Plant for fall: Sep 1 to Sep 22
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 23 to Apr 6Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 16 to Mar 30Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 23 to Apr 6Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 13 to Apr 27
Sow outdoors: Feb 23 to Mar 16Plant for fall: Aug 18 to Sep 8
Sow outdoors: Feb 23 to Mar 16Plant for fall: Sep 15 to Oct 6
Sow outdoors: Mar 2 to Apr 13Plant for fall: Sep 29 to Oct 20
Start indoors: Mar 9 to Mar 16Transplant outside: Apr 20 to Apr 27Sow outdoors: Apr 13 to Apr 27Plant for fall: Aug 25 to Sep 8
Start indoors: Mar 9 to Mar 16Sow outdoors: Apr 13 to Apr 27Plant for fall: Sep 1 to Sep 15
Start indoors: Mar 9 to Mar 16Sow outdoors: Apr 13 to Apr 27
Start indoors: Mar 9 to Mar 16Transplant outside: Apr 20 to May 4
Sow outdoors: Mar 16 to Apr 13Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 16 to Apr 13Plant for fall: Sep 1 to Sep 15
Sow outdoors: Mar 16 to Apr 6
Sow outdoors: Mar 23 to Apr 20Plant for fall: Sep 1 to Sep 15
Sow outdoors: Mar 23 to Apr 13Plant for fall: Sep 15 to Oct 6
Sow outdoors: Apr 13 to May 4Plant for fall: Aug 25 to Sep 8
Sow outdoors: Apr 13 to Apr 27
Transplant outside: Apr 20 to May 11
Plant for fall: Oct 27 to Dec 1
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Stonyford, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 12 – Jan 26 | Mar 9 – Mar 23 | — | — |
| Peppers | Jan 26 – Feb 9 | Apr 20 – May 4 | — | — |
| Eggplant | Jan 26 – Feb 9 | Apr 20 – May 4 | — | — |
| Tomatoes | Feb 9 – Feb 23 | Apr 13 – Apr 27 | — | — |
| Lettuce | Feb 9 – Feb 23 | Mar 16 – Mar 30 | Mar 9 – Apr 13 | Sep 15 – Oct 13 |
| Kale | Feb 9 – Feb 23 | Mar 9 – Mar 23 | Mar 9 – Mar 23 | Sep 1 – Sep 22 |
| Broccoli | Feb 9 – Feb 23 | Mar 23 – Apr 6 | — | Aug 4 – Aug 25 |
| Cabbage | Feb 9 – Feb 23 | Mar 16 – Mar 30 | — | Aug 4 – Aug 25 |
| Cauliflower | Feb 9 – Feb 23 | Mar 23 – Apr 6 | — | Aug 4 – Aug 25 |
| Okra | Feb 23 – Mar 9 | Apr 27 – May 11 | Apr 27 – May 11 | — |
| Basil | Feb 23 – Mar 9 | Apr 13 – Apr 27 | — | — |
| Peas | — | — | Feb 23 – Mar 16 | Aug 18 – Sep 8 |
| Spinach | — | — | Feb 23 – Mar 16 | Sep 15 – Oct 6 |
| Radishes | — | — | Mar 2 – Apr 13 | Sep 29 – Oct 20 |
| Cucumbers | Mar 9 – Mar 16 | Apr 20 – Apr 27 | Apr 13 – Apr 27 | Aug 25 – Sep 8 |
| Zucchini & Summer Squash | Mar 9 – Mar 16 | — | Apr 13 – Apr 27 | Sep 1 – Sep 15 |
| Winter Squash & Pumpkins | Mar 9 – Mar 16 | — | Apr 13 – Apr 27 | — |
| Melons & Watermelon | Mar 9 – Mar 16 | Apr 20 – May 4 | — | — |
| Carrots | — | — | Mar 16 – Apr 13 | Aug 18 – Sep 1 |
| Beets | — | — | Mar 16 – Apr 13 | Sep 1 – Sep 15 |
| Potatoes | — | — | Mar 16 – Apr 6 | — |
| Swiss Chard | — | — | Mar 23 – Apr 20 | Sep 1 – Sep 15 |
| Cilantro | — | — | Mar 23 – Apr 13 | Sep 15 – Oct 6 |
| Green Beans | — | — | Apr 13 – May 4 | Aug 25 – Sep 8 |
| Sweet Corn | — | — | Apr 13 – Apr 27 | — |
| Sweet Potatoes | — | Apr 20 – May 11 | — | — |
| Garlic | — | — | — | Oct 27 – Dec 1 |
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 East Park Rsvr, CA weather station, 5 km away (elevation 1,204 ft (367 m)).
Frost dates near Stonyford
- Elk Creek Apr 5 · Nov 13
- Clearlake Oaks Apr 10 · Nov 6
- Maxwell Feb 14 · Dec 1
- Nice Apr 10 · Nov 6
- Willows Feb 21 · Dec 6
- Lucerne Apr 10 · Nov 6
- Williams Feb 14 · Dec 1
- Upper Lake Mar 5 · Nov 21
- Glenhaven Apr 10 · Nov 6
- Witter Springs Mar 5 · Nov 21
Frequently asked questions
When is the last frost in Stonyford, CA?
The median last spring frost in Stonyford, CA is April 6. There is still about a 10% chance of frost after April 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Stonyford, CA?
The median first fall frost is November 10, with about a 10% chance of frost before October 27.
How long is the growing season in Stonyford, CA?
About 218 days between the median last spring frost and first fall frost.
What planting zone is Stonyford, CA?
Stonyford, CA is in USDA hardiness zone 9a.