Angwin, CA frost dates
Last spring frostApr 7median date
First fall frostDec 5median date
Growing season242 daysfrost-free
Hardiness zone9bZone 9b
How Angwin compares
- In 8 years out of 10, the last spring frost in Angwin falls between February 23 and April 30, a 66-day window. The first fall frost falls between November 14 and January 1.
- The median last frost is 7 days later than the California median of Mar 31.
- Its 242-day growing season is longer than 53% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 46 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 15 nights a year at or below 32°F.
- Compared with Santa Rosa, CA, 27 km away, the last frost here is 41 days later than there and the growing season is 37 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 23 |
| 50% (median) | April 7 |
| 10% (safe for tender plants) | April 30 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 14 |
| 50% (median) | December 5 |
| 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 Angwin, CA
Angwin, CA frost dates — last frost Apr 7, first frost Dec 5, zone 9b. whenisthelastfrost.com
Crop
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Start indoors: Jan 13 to Jan 27Transplant outside: Mar 10 to Mar 24
Start indoors: Jan 27 to Feb 10Transplant outside: Apr 21 to May 5
Start indoors: Jan 27 to Feb 10Transplant outside: Apr 21 to May 5
Start indoors: Feb 10 to Feb 24Transplant outside: Apr 14 to Apr 28
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 17 to Mar 31Sow outdoors: Mar 10 to Apr 14Plant for fall: Oct 10 to Nov 7
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 10 to Mar 24Sow outdoors: Mar 10 to Mar 24Plant for fall: Sep 26 to Oct 17
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 24 to Apr 7Plant for fall: Aug 29 to Sep 19
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 17 to Mar 31Plant for fall: Aug 29 to Sep 19
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 24 to Apr 7Plant for fall: Aug 29 to Sep 19
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 28 to May 12Sow outdoors: Apr 28 to May 12
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 14 to Apr 28
Sow outdoors: Feb 24 to Mar 17Plant for fall: Sep 12 to Oct 3
Sow outdoors: Feb 24 to Mar 17Plant for fall: Oct 10 to Oct 31
Sow outdoors: Mar 3 to Apr 14Plant for fall: Oct 24 to Nov 14
Start indoors: Mar 10 to Mar 17Transplant outside: Apr 21 to Apr 28Sow outdoors: Apr 14 to Apr 28Plant for fall: Sep 19 to Oct 3
Start indoors: Mar 10 to Mar 17Sow outdoors: Apr 14 to Apr 28Plant for fall: Sep 26 to Oct 10
Start indoors: Mar 10 to Mar 17Sow outdoors: Apr 14 to Apr 28
Start indoors: Mar 10 to Mar 17Transplant outside: Apr 21 to May 5
Sow outdoors: Mar 17 to Apr 14Plant for fall: Sep 12 to Sep 26
Sow outdoors: Mar 17 to Apr 14Plant for fall: Sep 26 to Oct 10
Sow outdoors: Mar 17 to Apr 7
Sow outdoors: Mar 24 to Apr 21Plant for fall: Sep 26 to Oct 10
Sow outdoors: Mar 24 to Apr 14Plant for fall: Oct 10 to Oct 31
Sow outdoors: Apr 14 to May 5Plant for fall: Sep 19 to Oct 3
Sow outdoors: Apr 14 to Apr 28
Transplant outside: Apr 21 to May 12
Plant for fall: Nov 21 to Dec 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Angwin, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 13 – Jan 27 | Mar 10 – Mar 24 | — | — |
| Peppers | Jan 27 – Feb 10 | Apr 21 – May 5 | — | — |
| Eggplant | Jan 27 – Feb 10 | Apr 21 – May 5 | — | — |
| Tomatoes | Feb 10 – Feb 24 | Apr 14 – Apr 28 | — | — |
| Lettuce | Feb 10 – Feb 24 | Mar 17 – Mar 31 | Mar 10 – Apr 14 | Oct 10 – Nov 7 |
| Kale | Feb 10 – Feb 24 | Mar 10 – Mar 24 | Mar 10 – Mar 24 | Sep 26 – Oct 17 |
| Broccoli | Feb 10 – Feb 24 | Mar 24 – Apr 7 | — | Aug 29 – Sep 19 |
| Cabbage | Feb 10 – Feb 24 | Mar 17 – Mar 31 | — | Aug 29 – Sep 19 |
| Cauliflower | Feb 10 – Feb 24 | Mar 24 – Apr 7 | — | Aug 29 – Sep 19 |
| Okra | Feb 24 – Mar 10 | Apr 28 – May 12 | Apr 28 – May 12 | — |
| Basil | Feb 24 – Mar 10 | Apr 14 – Apr 28 | — | — |
| Peas | — | — | Feb 24 – Mar 17 | Sep 12 – Oct 3 |
| Spinach | — | — | Feb 24 – Mar 17 | Oct 10 – Oct 31 |
| Radishes | — | — | Mar 3 – Apr 14 | Oct 24 – Nov 14 |
| Cucumbers | Mar 10 – Mar 17 | Apr 21 – Apr 28 | Apr 14 – Apr 28 | Sep 19 – Oct 3 |
| Zucchini & Summer Squash | Mar 10 – Mar 17 | — | Apr 14 – Apr 28 | Sep 26 – Oct 10 |
| Winter Squash & Pumpkins | Mar 10 – Mar 17 | — | Apr 14 – Apr 28 | — |
| Melons & Watermelon | Mar 10 – Mar 17 | Apr 21 – May 5 | — | — |
| Carrots | — | — | Mar 17 – Apr 14 | Sep 12 – Sep 26 |
| Beets | — | — | Mar 17 – Apr 14 | Sep 26 – Oct 10 |
| Potatoes | — | — | Mar 17 – Apr 7 | — |
| Swiss Chard | — | — | Mar 24 – Apr 21 | Sep 26 – Oct 10 |
| Cilantro | — | — | Mar 24 – Apr 14 | Oct 10 – Oct 31 |
| Green Beans | — | — | Apr 14 – May 5 | Sep 19 – Oct 3 |
| Sweet Corn | — | — | Apr 14 – Apr 28 | — |
| Sweet Potatoes | — | Apr 21 – May 12 | — | — |
| Garlic | — | — | — | Nov 21 – Dec 26 |
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 Angwin Pacific Union College, CA weather station, about 1 km away (elevation 1,716 ft (523 m)).
Frost dates near Angwin
- Deer Park Apr 7 · Dec 5
- Pope Valley Apr 7 · Dec 5
- Saint Helena Feb 3 · Dec 4
- Calistoga Mar 2 · Nov 23
- Rutherford Feb 3 · Dec 4
- Oakville Feb 3 · Dec 4
- Kenwood Feb 3 · Dec 4
- Yountville Mar 2 · Nov 27
- Glen Ellen Mar 2 · Nov 27
- Eldridge Mar 2 · Nov 27
Frequently asked questions
When is the last frost in Angwin, CA?
The median last spring frost in Angwin, CA is April 7. There is still about a 10% chance of frost after April 30, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Angwin, CA?
The median first fall frost is December 5, with about a 10% chance of frost before November 14.
How long is the growing season in Angwin, CA?
About 242 days between the median last spring frost and first fall frost.
What planting zone is Angwin, CA?
Angwin, CA is in USDA hardiness zone 9b.