Klamath, CA frost dates
Last spring frostMar 16median date
First fall frostNov 20median date
Growing season249 daysfrost-free
Hardiness zone9bZone 9b
How Klamath compares
- In 8 years out of 10, the last spring frost in Klamath falls between February 8 and April 20, a 71-day window. The first fall frost falls between October 30 and December 18.
- The median last frost is 15 days earlier than the California median of Mar 31.
- Its 249-day growing season is longer than 55% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 24 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 26 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 8 |
| 50% (median) | March 16 |
| 10% (safe for tender plants) | April 20 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 30 |
| 50% (median) | November 20 |
| 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 Klamath, CA
Klamath, CA frost dates — last frost Mar 16, first frost Nov 20, zone 9b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 22 to Jan 5Start indoors: Dec 22 to Jan 5Transplant outside: Feb 16 to Mar 2
Start indoors: Jan 5 to Jan 19Transplant outside: Mar 30 to Apr 13
Start indoors: Jan 5 to Jan 19Transplant outside: Mar 30 to Apr 13
Start indoors: Jan 19 to Feb 2Transplant outside: Mar 23 to Apr 6
Start indoors: Jan 19 to Feb 2Transplant outside: Feb 23 to Mar 9Sow outdoors: Feb 16 to Mar 23Plant for fall: Sep 25 to Oct 23
Start indoors: Jan 19 to Feb 2Transplant outside: Feb 16 to Mar 2Sow outdoors: Feb 16 to Mar 2Plant for fall: Sep 11 to Oct 2
Start indoors: Jan 19 to Feb 2Transplant outside: Mar 2 to Mar 16Plant for fall: Aug 14 to Sep 4
Start indoors: Jan 19 to Feb 2Transplant outside: Feb 23 to Mar 9Plant for fall: Aug 14 to Sep 4
Start indoors: Jan 19 to Feb 2Transplant outside: Mar 2 to Mar 16Plant for fall: Aug 14 to Sep 4
Start indoors: Feb 2 to Feb 16Transplant outside: Apr 6 to Apr 20Sow outdoors: Apr 6 to Apr 20
Start indoors: Feb 2 to Feb 16Transplant outside: Mar 23 to Apr 6
Sow outdoors: Feb 2 to Feb 23Plant for fall: Aug 28 to Sep 18
Sow outdoors: Feb 2 to Feb 23Plant for fall: Sep 25 to Oct 16
Sow outdoors: Feb 9 to Mar 23Plant for fall: Oct 9 to Oct 30
Start indoors: Feb 16 to Feb 23Transplant outside: Mar 30 to Apr 6Sow outdoors: Mar 23 to Apr 6Plant for fall: Sep 4 to Sep 18
Start indoors: Feb 16 to Feb 23Sow outdoors: Mar 23 to Apr 6Plant for fall: Sep 11 to Sep 25
Start indoors: Feb 16 to Feb 23Sow outdoors: Mar 23 to Apr 6
Start indoors: Feb 16 to Feb 23Transplant outside: Mar 30 to Apr 13
Sow outdoors: Feb 23 to Mar 23Plant for fall: Aug 28 to Sep 11
Sow outdoors: Feb 23 to Mar 23Plant for fall: Sep 11 to Sep 25
Sow outdoors: Feb 23 to Mar 16
Sow outdoors: Mar 2 to Mar 30Plant for fall: Sep 11 to Sep 25
Sow outdoors: Mar 2 to Mar 23Plant for fall: Sep 25 to Oct 16
Sow outdoors: Mar 23 to Apr 13Plant for fall: Sep 4 to Sep 18
Sow outdoors: Mar 23 to Apr 6
Transplant outside: Mar 30 to Apr 20
Plant for fall: Nov 6 to Dec 11
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Klamath, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 22 – Jan 5 | Feb 16 – Mar 2 | — | — |
| Peppers | Jan 5 – Jan 19 | Mar 30 – Apr 13 | — | — |
| Eggplant | Jan 5 – Jan 19 | Mar 30 – Apr 13 | — | — |
| Tomatoes | Jan 19 – Feb 2 | Mar 23 – Apr 6 | — | — |
| Lettuce | Jan 19 – Feb 2 | Feb 23 – Mar 9 | Feb 16 – Mar 23 | Sep 25 – Oct 23 |
| Kale | Jan 19 – Feb 2 | Feb 16 – Mar 2 | Feb 16 – Mar 2 | Sep 11 – Oct 2 |
| Broccoli | Jan 19 – Feb 2 | Mar 2 – Mar 16 | — | Aug 14 – Sep 4 |
| Cabbage | Jan 19 – Feb 2 | Feb 23 – Mar 9 | — | Aug 14 – Sep 4 |
| Cauliflower | Jan 19 – Feb 2 | Mar 2 – Mar 16 | — | Aug 14 – Sep 4 |
| Okra | Feb 2 – Feb 16 | Apr 6 – Apr 20 | Apr 6 – Apr 20 | — |
| Basil | Feb 2 – Feb 16 | Mar 23 – Apr 6 | — | — |
| Peas | — | — | Feb 2 – Feb 23 | Aug 28 – Sep 18 |
| Spinach | — | — | Feb 2 – Feb 23 | Sep 25 – Oct 16 |
| Radishes | — | — | Feb 9 – Mar 23 | Oct 9 – Oct 30 |
| Cucumbers | Feb 16 – Feb 23 | Mar 30 – Apr 6 | Mar 23 – Apr 6 | Sep 4 – Sep 18 |
| Zucchini & Summer Squash | Feb 16 – Feb 23 | — | Mar 23 – Apr 6 | Sep 11 – Sep 25 |
| Winter Squash & Pumpkins | Feb 16 – Feb 23 | — | Mar 23 – Apr 6 | — |
| Melons & Watermelon | Feb 16 – Feb 23 | Mar 30 – Apr 13 | — | — |
| Carrots | — | — | Feb 23 – Mar 23 | Aug 28 – Sep 11 |
| Beets | — | — | Feb 23 – Mar 23 | Sep 11 – Sep 25 |
| Potatoes | — | — | Feb 23 – Mar 16 | — |
| Swiss Chard | — | — | Mar 2 – Mar 30 | Sep 11 – Sep 25 |
| Cilantro | — | — | Mar 2 – Mar 23 | Sep 25 – Oct 16 |
| Green Beans | — | — | Mar 23 – Apr 13 | Sep 4 – Sep 18 |
| Sweet Corn | — | — | Mar 23 – Apr 6 | — |
| Sweet Potatoes | — | Mar 30 – Apr 20 | — | — |
| Garlic | — | — | — | Nov 6 – Dec 11 |
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 Klamath, CA weather station, 3 km away (elevation 30 ft (9 m)).
Frost dates near Klamath
- Crescent City Mar 11 · Nov 23
- Orick Apr 12 · Nov 6
- Fort Dick Mar 11 · Nov 23
- Gasquet May 1 · Oct 12
- Smith River Jan 31 · Dec 27
- Somes Bar Mar 12 · Nov 26
- Orleans Mar 12 · Nov 26
- Trinidad Mar 8 · Nov 30
- Happy Camp May 1 · Oct 12
- Hoopa Mar 12 · Nov 26
Frequently asked questions
When is the last frost in Klamath, CA?
The median last spring frost in Klamath, CA is March 16. There is still about a 10% chance of frost after April 20, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Klamath, CA?
The median first fall frost is November 20, with about a 10% chance of frost before October 30.
How long is the growing season in Klamath, CA?
About 249 days between the median last spring frost and first fall frost.
What planting zone is Klamath, CA?
Klamath, CA is in USDA hardiness zone 9b.