Whitmore, CA frost dates
Last spring frostJun 9median date
First fall frostSep 21median date
Growing season104 daysfrost-free
Hardiness zone9aZone 9a
How Whitmore compares
- In 8 years out of 10, the last spring frost in Whitmore falls between May 21 and June 27, a 37-day window. The first fall frost falls between September 1 and October 11.
- The median last frost is 70 days later than the California median of Mar 31.
- Its 104-day growing season is longer than 3% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 98 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 195 nights a year at or below 32°F.
- Nearby Redding, 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) | May 21 |
| 50% (median) | June 9 |
| 10% (safe for tender plants) | June 27 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 1 |
| 50% (median) | September 21 |
| 90% (late) | October 11 |
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 Whitmore, CA
Whitmore, CA frost dates — last frost Jun 9, first frost Sep 21, zone 9a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 17 to Mar 31Transplant outside: May 12 to May 26
Start indoors: Mar 31 to Apr 14Transplant outside: Jun 23 to Jul 7
Start indoors: Mar 31 to Apr 14Transplant outside: Jun 23 to Jul 7
Start indoors: Apr 14 to Apr 28Transplant outside: Jun 16 to Jun 30
Start indoors: Apr 14 to Apr 28Transplant outside: May 19 to Jun 2Sow outdoors: May 12 to Jun 16Plant for fall: Jul 27 to Aug 24
Start indoors: Apr 14 to Apr 28Transplant outside: May 12 to May 26Sow outdoors: May 12 to May 26Plant for fall: Jul 13 to Aug 3
Start indoors: Apr 14 to Apr 28Transplant outside: May 26 to Jun 9
Start indoors: Apr 14 to Apr 28Transplant outside: May 19 to Jun 2
Start indoors: Apr 14 to Apr 28Transplant outside: May 26 to Jun 9
Start indoors: Apr 28 to May 12Transplant outside: Jun 30 to Jul 14Sow outdoors: Jun 30 to Jul 14
Start indoors: Apr 28 to May 12Transplant outside: Jun 16 to Jun 30
Sow outdoors: Apr 28 to May 19Plant for fall: Jun 29 to Jul 20
Sow outdoors: Apr 28 to May 19Plant for fall: Jul 27 to Aug 17
Sow outdoors: May 5 to Jun 16Plant for fall: Aug 10 to Aug 31
Start indoors: May 12 to May 19Transplant outside: Jun 23 to Jun 30Sow outdoors: Jun 16 to Jun 30
Start indoors: May 12 to May 19Sow outdoors: Jun 16 to Jun 30
Start indoors: May 12 to May 19Sow outdoors: Jun 16 to Jun 30
Start indoors: May 12 to May 19Transplant outside: Jun 23 to Jul 7
Sow outdoors: May 19 to Jun 16
Sow outdoors: May 19 to Jun 16Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 19 to Jun 9
Sow outdoors: May 26 to Jun 23Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 26 to Jun 16Plant for fall: Jul 27 to Aug 17
Sow outdoors: Jun 16 to Jul 7
Sow outdoors: Jun 16 to Jun 30
Transplant outside: Jun 23 to Jul 14
Plant for fall: Sep 7 to Oct 12
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Whitmore, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 17 – Mar 31 | May 12 – May 26 | — | — |
| Peppers | Mar 31 – Apr 14 | Jun 23 – Jul 7 | — | — |
| Eggplant | Mar 31 – Apr 14 | Jun 23 – Jul 7 | — | — |
| Tomatoes | Apr 14 – Apr 28 | Jun 16 – Jun 30 | — | — |
| Lettuce | Apr 14 – Apr 28 | May 19 – Jun 2 | May 12 – Jun 16 | Jul 27 – Aug 24 |
| Kale | Apr 14 – Apr 28 | May 12 – May 26 | May 12 – May 26 | Jul 13 – Aug 3 |
| Broccoli | Apr 14 – Apr 28 | May 26 – Jun 9 | — | — |
| Cabbage | Apr 14 – Apr 28 | May 19 – Jun 2 | — | — |
| Cauliflower | Apr 14 – Apr 28 | May 26 – Jun 9 | — | — |
| Okra | Apr 28 – May 12 | Jun 30 – Jul 14 | Jun 30 – Jul 14 | — |
| Basil | Apr 28 – May 12 | Jun 16 – Jun 30 | — | — |
| Peas | — | — | Apr 28 – May 19 | Jun 29 – Jul 20 |
| Spinach | — | — | Apr 28 – May 19 | Jul 27 – Aug 17 |
| Radishes | — | — | May 5 – Jun 16 | Aug 10 – Aug 31 |
| Cucumbers | May 12 – May 19 | Jun 23 – Jun 30 | Jun 16 – Jun 30 | — |
| Zucchini & Summer Squash | May 12 – May 19 | — | Jun 16 – Jun 30 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 104 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 12 – May 19 | — | Jun 16 – Jun 30 | — |
| Melons & Watermelon | May 12 – May 19 | Jun 23 – Jul 7 | — | — |
| Carrots | — | — | May 19 – Jun 16 | — |
| Beets | — | — | May 19 – Jun 16 | Jul 13 – Jul 27 |
| Potatoes | — | — | May 19 – Jun 9 | — |
| Swiss Chard | — | — | May 26 – Jun 23 | Jul 13 – Jul 27 |
| Cilantro | — | — | May 26 – Jun 16 | Jul 27 – Aug 17 |
| Green Beans | — | — | Jun 16 – Jul 7 | — |
| Sweet Corn | — | — | Jun 16 – Jun 30 | — |
| Sweet Potatoes Warning: Your frost-free season is about 104 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 23 – Jul 14 | — | — |
| Garlic | — | — | — | Sep 7 – Oct 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 Manzanita Lake, CA weather station, 28 km away (elevation 5,751 ft (1,753 m)).
Frost dates near Whitmore
- Oak Run Mar 3 · Nov 21
- Shingletown Jun 9 · Sep 21
- Round Mountain Jun 3 · Sep 14
- Bella Vista Feb 8 · Dec 28
- Millville Mar 3 · Nov 21
- Manton Jun 10 · Sep 13
- Obrien Feb 8 · Dec 28
- Montgomery Creek Jun 3 · Sep 14
- Palo Cedro Mar 3 · Nov 21
- Burney Jun 3 · Sep 14
Frequently asked questions
When is the last frost in Whitmore, CA?
The median last spring frost in Whitmore, CA is June 9. There is still about a 10% chance of frost after June 27, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Whitmore, CA?
The median first fall frost is September 21, with about a 10% chance of frost before September 1.
How long is the growing season in Whitmore, CA?
About 104 days between the median last spring frost and first fall frost.
What planting zone is Whitmore, CA?
Whitmore, CA is in USDA hardiness zone 9a.