Posey, CA frost dates
Last spring frostMay 11median date
First fall frostOct 17median date
Growing season159 daysfrost-free
Hardiness zone9aZone 9a
How Posey compares
- In 8 years out of 10, the last spring frost in Posey falls between April 21 and June 6, a 46-day window. The first fall frost falls between September 30 and November 4.
- The median last frost is 41 days later than the California median of Mar 31.
- Its 159-day growing season is longer than 17% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 69 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 108 nights a year at or below 32°F.
- Nearby Porterville, CA, 41 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) | April 21 |
| 50% (median) | May 11 |
| 10% (safe for tender plants) | June 6 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 30 |
| 50% (median) | October 17 |
| 90% (late) | November 4 |
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 Posey, CA
Posey, CA frost dates — last frost May 11, first frost Oct 17, zone 9a. whenisthelastfrost.com
Crop
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Start indoors: Feb 16 to Mar 2Transplant outside: Apr 13 to Apr 27
Start indoors: Mar 2 to Mar 16Transplant outside: May 25 to Jun 8
Start indoors: Mar 2 to Mar 16Transplant outside: May 25 to Jun 8
Start indoors: Mar 16 to Mar 30Transplant outside: May 18 to Jun 1
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 20 to May 4Sow outdoors: Apr 13 to May 18Plant for fall: Aug 22 to Sep 19
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 13 to Apr 27Sow outdoors: Apr 13 to Apr 27Plant for fall: Aug 8 to Aug 29
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 27 to May 11Plant for fall: Jul 11 to Aug 1
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 20 to May 4Plant for fall: Jul 11 to Aug 1
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 27 to May 11Plant for fall: Jul 11 to Aug 1
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 1 to Jun 15Sow outdoors: Jun 1 to Jun 15
Start indoors: Mar 30 to Apr 13Transplant outside: May 18 to Jun 1
Sow outdoors: Mar 30 to Apr 20Plant for fall: Jul 25 to Aug 15
Sow outdoors: Mar 30 to Apr 20Plant for fall: Aug 22 to Sep 12
Sow outdoors: Apr 6 to May 18Plant for fall: Sep 5 to Sep 26
Start indoors: Apr 13 to Apr 20Transplant outside: May 25 to Jun 1Sow outdoors: May 18 to Jun 1Plant for fall: Aug 1 to Aug 15
Start indoors: Apr 13 to Apr 20Sow outdoors: May 18 to Jun 1Plant for fall: Aug 8 to Aug 22
Start indoors: Apr 13 to Apr 20Sow outdoors: May 18 to Jun 1
Start indoors: Apr 13 to Apr 20Transplant outside: May 25 to Jun 8
Sow outdoors: Apr 20 to May 18Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 20 to May 18Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 20 to May 11
Sow outdoors: Apr 27 to May 25Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 27 to May 18Plant for fall: Aug 22 to Sep 12
Sow outdoors: May 18 to Jun 8Plant for fall: Aug 1 to Aug 15
Sow outdoors: May 18 to Jun 1
Transplant outside: May 25 to Jun 15
Plant for fall: Oct 3 to Nov 7
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Posey, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 16 – Mar 2 | Apr 13 – Apr 27 | — | — |
| Peppers | Mar 2 – Mar 16 | May 25 – Jun 8 | — | — |
| Eggplant | Mar 2 – Mar 16 | May 25 – Jun 8 | — | — |
| Tomatoes | Mar 16 – Mar 30 | May 18 – Jun 1 | — | — |
| Lettuce | Mar 16 – Mar 30 | Apr 20 – May 4 | Apr 13 – May 18 | Aug 22 – Sep 19 |
| Kale | Mar 16 – Mar 30 | Apr 13 – Apr 27 | Apr 13 – Apr 27 | Aug 8 – Aug 29 |
| Broccoli | Mar 16 – Mar 30 | Apr 27 – May 11 | — | Jul 11 – Aug 1 |
| Cabbage | Mar 16 – Mar 30 | Apr 20 – May 4 | — | Jul 11 – Aug 1 |
| Cauliflower | Mar 16 – Mar 30 | Apr 27 – May 11 | — | Jul 11 – Aug 1 |
| Okra | Mar 30 – Apr 13 | Jun 1 – Jun 15 | Jun 1 – Jun 15 | — |
| Basil | Mar 30 – Apr 13 | May 18 – Jun 1 | — | — |
| Peas | — | — | Mar 30 – Apr 20 | Jul 25 – Aug 15 |
| Spinach | — | — | Mar 30 – Apr 20 | Aug 22 – Sep 12 |
| Radishes | — | — | Apr 6 – May 18 | Sep 5 – Sep 26 |
| Cucumbers | Apr 13 – Apr 20 | May 25 – Jun 1 | May 18 – Jun 1 | Aug 1 – Aug 15 |
| Zucchini & Summer Squash | Apr 13 – Apr 20 | — | May 18 – Jun 1 | Aug 8 – Aug 22 |
| Winter Squash & Pumpkins | Apr 13 – Apr 20 | — | May 18 – Jun 1 | — |
| Melons & Watermelon | Apr 13 – Apr 20 | May 25 – Jun 8 | — | — |
| Carrots | — | — | Apr 20 – May 18 | Jul 25 – Aug 8 |
| Beets | — | — | Apr 20 – May 18 | Aug 8 – Aug 22 |
| Potatoes | — | — | Apr 20 – May 11 | — |
| Swiss Chard | — | — | Apr 27 – May 25 | Aug 8 – Aug 22 |
| Cilantro | — | — | Apr 27 – May 18 | Aug 22 – Sep 12 |
| Green Beans | — | — | May 18 – Jun 8 | Aug 1 – Aug 15 |
| Sweet Corn | — | — | May 18 – Jun 1 | — |
| Sweet Potatoes | — | May 25 – Jun 15 | — | — |
| Garlic | — | — | — | Oct 3 – Nov 7 |
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 Glennville, CA weather station, 10 km away (elevation 3,140 ft (957 m)).
Frost dates near Posey
- California Hot Springs May 11 · Oct 17
- Glennville May 11 · Oct 17
- Woody May 11 · Oct 17
- Wofford Heights Apr 7 · Nov 11
- Kernville Apr 7 · Nov 11
- Lake Isabella Apr 5 · Nov 3
- Bodfish Apr 5 · Nov 3
- Ducor Jan 20 · Dec 13
- Terra Bella Jan 20 · Dec 13
- Camp Nelson Jan 20 · Dec 13
Frequently asked questions
When is the last frost in Posey, CA?
The median last spring frost in Posey, CA is May 11. There is still about a 10% chance of frost after June 6, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Posey, CA?
The median first fall frost is October 17, with about a 10% chance of frost before September 30.
How long is the growing season in Posey, CA?
About 159 days between the median last spring frost and first fall frost.
What planting zone is Posey, CA?
Posey, CA is in USDA hardiness zone 9a.