Proberta, CA frost dates
Last spring frostFeb 22median date
First fall frostNov 29median date
Growing season280 daysfrost-free
Hardiness zone9aZone 9a
How Proberta compares
- In 8 years out of 10, the last spring frost in Proberta falls between January 17 and March 30, a 72-day window. The first fall frost falls between November 12 and December 18.
- The median last frost is 37 days earlier than the California median of Mar 31.
- Its 280-day growing season is longer than 78% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 9 days earlier 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 19 nights a year at or below 32°F.
- Compared with Chico, CA, 45 km away, the last frost here is 10 days earlier than there and the growing season is 22 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 17 |
| 50% (median) | February 22 |
| 10% (safe for tender plants) | March 30 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 12 |
| 50% (median) | November 29 |
| 90% (late) | December 18 |
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 Proberta, CA
Proberta, CA frost dates — last frost Feb 22, first frost Nov 29, zone 9a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Nov 30 to Dec 14Transplant outside: Jan 25 to Feb 8
Start indoors: Dec 14 to Dec 28Transplant outside: Mar 8 to Mar 22
Start indoors: Dec 14 to Dec 28Transplant outside: Mar 8 to Mar 22
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Mar 1 to Mar 15
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Feb 1 to Feb 15Sow outdoors: Jan 25 to Mar 1Plant for fall: Oct 4 to Nov 1
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Jan 25 to Feb 8Sow outdoors: Jan 25 to Feb 8Plant for fall: Sep 20 to Oct 11
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Feb 8 to Feb 22Plant for fall: Aug 23 to Sep 13
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Feb 1 to Feb 15Plant for fall: Aug 23 to Sep 13
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Feb 8 to Feb 22Plant for fall: Aug 23 to Sep 13
Start indoors: Jan 11 to Jan 25Transplant outside: Mar 15 to Mar 29Sow outdoors: Mar 15 to Mar 29
Start indoors: Jan 11 to Jan 25Transplant outside: Mar 1 to Mar 15
Sow outdoors: Jan 11 to Feb 1Plant for fall: Sep 6 to Sep 27
Sow outdoors: Jan 11 to Feb 1Plant for fall: Oct 4 to Oct 25
Sow outdoors: Jan 18 to Mar 1Plant for fall: Oct 18 to Nov 8
Start indoors: Jan 25 to Feb 1Transplant outside: Mar 8 to Mar 15Sow outdoors: Mar 1 to Mar 15Plant for fall: Sep 13 to Sep 27
Start indoors: Jan 25 to Feb 1Sow outdoors: Mar 1 to Mar 15Plant for fall: Sep 20 to Oct 4
Start indoors: Jan 25 to Feb 1Sow outdoors: Mar 1 to Mar 15
Start indoors: Jan 25 to Feb 1Transplant outside: Mar 8 to Mar 22
Sow outdoors: Feb 1 to Mar 1Plant for fall: Sep 6 to Sep 20
Sow outdoors: Feb 1 to Mar 1Plant for fall: Sep 20 to Oct 4
Sow outdoors: Feb 1 to Feb 22
Sow outdoors: Feb 8 to Mar 8Plant for fall: Sep 20 to Oct 4
Sow outdoors: Feb 8 to Mar 1Plant for fall: Oct 4 to Oct 25
Sow outdoors: Mar 1 to Mar 22Plant for fall: Sep 13 to Sep 27
Sow outdoors: Mar 1 to Mar 15
Transplant outside: Mar 8 to Mar 29
Plant for fall: Nov 15 to Dec 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Proberta, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 30 – Dec 14 | Jan 25 – Feb 8 | — | — |
| Peppers | Dec 14 – Dec 28 | Mar 8 – Mar 22 | — | — |
| Eggplant | Dec 14 – Dec 28 | Mar 8 – Mar 22 | — | — |
| Tomatoes | Dec 28 – Jan 11 | Mar 1 – Mar 15 | — | — |
| Lettuce | Dec 28 – Jan 11 | Feb 1 – Feb 15 | Jan 25 – Mar 1 | Oct 4 – Nov 1 |
| Kale | Dec 28 – Jan 11 | Jan 25 – Feb 8 | Jan 25 – Feb 8 | Sep 20 – Oct 11 |
| Broccoli | Dec 28 – Jan 11 | Feb 8 – Feb 22 | — | Aug 23 – Sep 13 |
| Cabbage | Dec 28 – Jan 11 | Feb 1 – Feb 15 | — | Aug 23 – Sep 13 |
| Cauliflower | Dec 28 – Jan 11 | Feb 8 – Feb 22 | — | Aug 23 – Sep 13 |
| Okra | Jan 11 – Jan 25 | Mar 15 – Mar 29 | Mar 15 – Mar 29 | — |
| Basil | Jan 11 – Jan 25 | Mar 1 – Mar 15 | — | — |
| Peas | — | — | Jan 11 – Feb 1 | Sep 6 – Sep 27 |
| Spinach | — | — | Jan 11 – Feb 1 | Oct 4 – Oct 25 |
| Radishes | — | — | Jan 18 – Mar 1 | Oct 18 – Nov 8 |
| Cucumbers | Jan 25 – Feb 1 | Mar 8 – Mar 15 | Mar 1 – Mar 15 | Sep 13 – Sep 27 |
| Zucchini & Summer Squash | Jan 25 – Feb 1 | — | Mar 1 – Mar 15 | Sep 20 – Oct 4 |
| Winter Squash & Pumpkins | Jan 25 – Feb 1 | — | Mar 1 – Mar 15 | — |
| Melons & Watermelon | Jan 25 – Feb 1 | Mar 8 – Mar 22 | — | — |
| Carrots | — | — | Feb 1 – Mar 1 | Sep 6 – Sep 20 |
| Beets | — | — | Feb 1 – Mar 1 | Sep 20 – Oct 4 |
| Potatoes | — | — | Feb 1 – Feb 22 | — |
| Swiss Chard | — | — | Feb 8 – Mar 8 | Sep 20 – Oct 4 |
| Cilantro | — | — | Feb 8 – Mar 1 | Oct 4 – Oct 25 |
| Green Beans | — | — | Mar 1 – Mar 22 | Sep 13 – Sep 27 |
| Sweet Corn | — | — | Mar 1 – Mar 15 | — |
| Sweet Potatoes | — | Mar 8 – Mar 29 | — | — |
| Garlic | — | — | — | Nov 15 – Dec 20 |
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 Red Bluff Muni Ap, CA weather station, 11 km away (elevation 354 ft (108 m)).
Frost dates near Proberta
- Gerber Feb 22 · Nov 29
- Los Molinos Feb 22 · Nov 29
- Tehama Feb 22 · Nov 29
- Red Bluff Feb 22 · Nov 29
- Corning Feb 25 · Dec 2
- Vina Feb 25 · Dec 2
- Flournoy Feb 25 · Dec 2
- Cottonwood Mar 3 · Nov 21
- Orland Feb 25 · Dec 2
- Hamilton City Feb 25 · Dec 2
Frequently asked questions
When is the last frost in Proberta, CA?
The median last spring frost in Proberta, CA is February 22. There is still about a 10% chance of frost after March 30, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Proberta, CA?
The median first fall frost is November 29, with about a 10% chance of frost before November 12.
How long is the growing season in Proberta, CA?
About 280 days between the median last spring frost and first fall frost.
What planting zone is Proberta, CA?
Proberta, CA is in USDA hardiness zone 9a.