Philo, CA frost dates
Last spring frostMar 5median date
First fall frostNov 21median date
Growing season261 daysfrost-free
Hardiness zone9bZone 9b
How Philo compares
- In 8 years out of 10, the last spring frost in Philo falls between January 29 and April 7, a 68-day window. The first fall frost falls between November 2 and December 9.
- 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 36 nights a year at or below 32°F.
- Compared with Santa Rosa, CA, 94 km away, the last frost here is 8 days later than there and the growing season is 18 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 29 |
| 50% (median) | March 5 |
| 10% (safe for tender plants) | April 7 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 2 |
| 50% (median) | November 21 |
| 90% (late) | December 9 |
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 Philo, CA
Philo, CA frost dates — 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 Philo, 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 Ukiah Muni Ap, CA weather station, 22 km away (elevation 600 ft (183 m)).
Frost dates near Philo
- Boonville Mar 5 · Nov 21
- Navarro Mar 19 · Nov 20
- Manchester Mar 5 · Nov 21
- Yorkville Mar 5 · Nov 21
- Point Arena Mar 5 · Nov 21
- Ukiah Mar 19 · Nov 20
- Talmage Mar 5 · Nov 21
- Elk Mar 2 · Dec 1
- Calpella Mar 19 · Nov 20
- Comptche May 5 · Oct 9
Frequently asked questions
When is the last frost in Philo, CA?
The median last spring frost in Philo, CA is March 5. There is still about a 10% chance of frost after April 7, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Philo, CA?
The median first fall frost is November 21, with about a 10% chance of frost before November 2.
How long is the growing season in Philo, CA?
About 261 days between the median last spring frost and first fall frost.
What planting zone is Philo, CA?
Philo, CA is in USDA hardiness zone 9b.