Calistoga, CA frost dates
Last spring frostMar 2median date
First fall frostNov 23median date
Growing season266 daysfrost-free
Hardiness zone9bZone 9b
How Calistoga compares
- In 8 years out of 10, the last spring frost in Calistoga falls between January 19 and April 18, a 89-day window. The first fall frost falls between November 1 and December 20.
- The median last frost is 29 days earlier than the California median of Mar 31.
- Its 266-day growing season is longer than 64% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 10 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, 19 km away, the last frost here is 5 days later than there and the growing season is 13 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 19 |
| 50% (median) | March 2 |
| 10% (safe for tender plants) | April 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 1 |
| 50% (median) | November 23 |
| 90% (late) | December 20 |
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 Calistoga, CA
Calistoga, CA frost dates — last frost Mar 2, first frost Nov 23, zone 9b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 8 to Dec 22Transplant outside: Feb 2 to Feb 16
Start indoors: Dec 22 to Jan 5Start indoors: Dec 22 to Jan 5Transplant outside: Mar 16 to Mar 30
Start indoors: Dec 22 to Jan 5Start indoors: Dec 22 to Jan 5Transplant outside: Mar 16 to Mar 30
Start indoors: Jan 5 to Jan 19Transplant outside: Mar 9 to Mar 23
Start indoors: Jan 5 to Jan 19Transplant outside: Feb 9 to Feb 23Sow outdoors: Feb 2 to Mar 9Plant for fall: Sep 28 to Oct 26
Start indoors: Jan 5 to Jan 19Transplant outside: Feb 2 to Feb 16Sow outdoors: Feb 2 to Feb 16Plant for fall: Sep 14 to Oct 5
Start indoors: Jan 5 to Jan 19Transplant outside: Feb 16 to Mar 2Plant for fall: Aug 17 to Sep 7
Start indoors: Jan 5 to Jan 19Transplant outside: Feb 9 to Feb 23Plant for fall: Aug 17 to Sep 7
Start indoors: Jan 5 to Jan 19Transplant outside: Feb 16 to Mar 2Plant for fall: Aug 17 to Sep 7
Start indoors: Jan 19 to Feb 2Transplant outside: Mar 23 to Apr 6Sow outdoors: Mar 23 to Apr 6
Start indoors: Jan 19 to Feb 2Transplant outside: Mar 9 to Mar 23
Sow outdoors: Jan 19 to Feb 9Plant for fall: Aug 31 to Sep 21
Sow outdoors: Jan 19 to Feb 9Plant for fall: Sep 28 to Oct 19
Sow outdoors: Jan 26 to Mar 9Plant for fall: Oct 12 to Nov 2
Start indoors: Feb 2 to Feb 9Transplant outside: Mar 16 to Mar 23Sow outdoors: Mar 9 to Mar 23Plant for fall: Sep 7 to Sep 21
Start indoors: Feb 2 to Feb 9Sow outdoors: Mar 9 to Mar 23Plant for fall: Sep 14 to Sep 28
Start indoors: Feb 2 to Feb 9Sow outdoors: Mar 9 to Mar 23
Start indoors: Feb 2 to Feb 9Transplant outside: Mar 16 to Mar 30
Sow outdoors: Feb 9 to Mar 9Plant for fall: Aug 31 to Sep 14
Sow outdoors: Feb 9 to Mar 9Plant for fall: Sep 14 to Sep 28
Sow outdoors: Feb 9 to Mar 2
Sow outdoors: Feb 16 to Mar 16Plant for fall: Sep 14 to Sep 28
Sow outdoors: Feb 16 to Mar 9Plant for fall: Sep 28 to Oct 19
Sow outdoors: Mar 9 to Mar 30Plant for fall: Sep 7 to Sep 21
Sow outdoors: Mar 9 to Mar 23
Transplant outside: Mar 16 to Apr 6
Plant for fall: Nov 9 to Dec 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Calistoga, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 8 – Dec 22 | Feb 2 – Feb 16 | — | — |
| Peppers | Dec 22 – Jan 5 | Mar 16 – Mar 30 | — | — |
| Eggplant | Dec 22 – Jan 5 | Mar 16 – Mar 30 | — | — |
| Tomatoes | Jan 5 – Jan 19 | Mar 9 – Mar 23 | — | — |
| Lettuce | Jan 5 – Jan 19 | Feb 9 – Feb 23 | Feb 2 – Mar 9 | Sep 28 – Oct 26 |
| Kale | Jan 5 – Jan 19 | Feb 2 – Feb 16 | Feb 2 – Feb 16 | Sep 14 – Oct 5 |
| Broccoli | Jan 5 – Jan 19 | Feb 16 – Mar 2 | — | Aug 17 – Sep 7 |
| Cabbage | Jan 5 – Jan 19 | Feb 9 – Feb 23 | — | Aug 17 – Sep 7 |
| Cauliflower | Jan 5 – Jan 19 | Feb 16 – Mar 2 | — | Aug 17 – Sep 7 |
| Okra | Jan 19 – Feb 2 | Mar 23 – Apr 6 | Mar 23 – Apr 6 | — |
| Basil | Jan 19 – Feb 2 | Mar 9 – Mar 23 | — | — |
| Peas | — | — | Jan 19 – Feb 9 | Aug 31 – Sep 21 |
| Spinach | — | — | Jan 19 – Feb 9 | Sep 28 – Oct 19 |
| Radishes | — | — | Jan 26 – Mar 9 | Oct 12 – Nov 2 |
| Cucumbers | Feb 2 – Feb 9 | Mar 16 – Mar 23 | Mar 9 – Mar 23 | Sep 7 – Sep 21 |
| Zucchini & Summer Squash | Feb 2 – Feb 9 | — | Mar 9 – Mar 23 | Sep 14 – Sep 28 |
| Winter Squash & Pumpkins | Feb 2 – Feb 9 | — | Mar 9 – Mar 23 | — |
| Melons & Watermelon | Feb 2 – Feb 9 | Mar 16 – Mar 30 | — | — |
| Carrots | — | — | Feb 9 – Mar 9 | Aug 31 – Sep 14 |
| Beets | — | — | Feb 9 – Mar 9 | Sep 14 – Sep 28 |
| Potatoes | — | — | Feb 9 – Mar 2 | — |
| Swiss Chard | — | — | Feb 16 – Mar 16 | Sep 14 – Sep 28 |
| Cilantro | — | — | Feb 16 – Mar 9 | Sep 28 – Oct 19 |
| Green Beans | — | — | Mar 9 – Mar 30 | Sep 7 – Sep 21 |
| Sweet Corn | — | — | Mar 9 – Mar 23 | — |
| Sweet Potatoes | — | Mar 16 – Apr 6 | — | — |
| Garlic | — | — | — | Nov 9 – Dec 14 |
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 Calistoga, CA weather station, 2 km away (elevation 400 ft (122 m)).
Frost dates near Calistoga
- Deer Park Apr 7 · Dec 5
- Angwin Apr 7 · Dec 5
- Saint Helena Feb 3 · Dec 4
- Pope Valley Apr 7 · Dec 5
- Kenwood Feb 3 · Dec 4
- Santa Rosa Feb 25 · Dec 1
- Rutherford Feb 3 · Dec 4
- Fulton Mar 2 · Nov 20
- Windsor Mar 2 · Nov 20
- Oakville Feb 3 · Dec 4
Frequently asked questions
When is the last frost in Calistoga, CA?
The median last spring frost in Calistoga, CA is March 2. There is still about a 10% chance of frost after April 18, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Calistoga, CA?
The median first fall frost is November 23, with about a 10% chance of frost before November 1.
How long is the growing season in Calistoga, CA?
About 266 days between the median last spring frost and first fall frost.
What planting zone is Calistoga, CA?
Calistoga, CA is in USDA hardiness zone 9b.