Cathlamet, WA frost dates
Last spring frostApr 24median date
First fall frostOct 24median date
Growing season183 daysfrost-free
Hardiness zone8bZone 8b
How Cathlamet compares
- In 8 years out of 10, the last spring frost in Cathlamet falls between March 31 and May 9, a 39-day window. The first fall frost falls between October 5 and November 12.
- The median last frost is 3 days later than the Washington median of Apr 21.
- Its 183-day growing season is longer than 51% of the 491 Washington places with a regular frost season (state median 182 days).
- The last frost is 39 days later than the zone 8b median of Mar 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8b chart.
- The weather station records an average of 70 nights a year at or below 32°F.
- Compared with Hillsboro, OR, 81 km away, the last frost here is 8 days later than there and the growing season is 7 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 31 |
| 50% (median) | April 24 |
| 10% (safe for tender plants) | May 9 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 5 |
| 50% (median) | October 24 |
| 90% (late) | November 12 |
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 Cathlamet, WA
Cathlamet, WA frost dates — last frost Apr 24, first frost Oct 24, zone 8b. whenisthelastfrost.com
Crop
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Start indoors: Jan 30 to Feb 13Transplant outside: Mar 27 to Apr 10
Start indoors: Feb 13 to Feb 27Transplant outside: May 8 to May 22
Start indoors: Feb 13 to Feb 27Transplant outside: May 8 to May 22
Start indoors: Feb 27 to Mar 13Transplant outside: May 1 to May 15
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 3 to Apr 17Sow outdoors: Mar 27 to May 1Plant for fall: Aug 29 to Sep 26
Start indoors: Feb 27 to Mar 13Transplant outside: Mar 27 to Apr 10Sow outdoors: Mar 27 to Apr 10Plant for fall: Aug 15 to Sep 5
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 10 to Apr 24Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 3 to Apr 17Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 10 to Apr 24Plant for fall: Jul 18 to Aug 8
Start indoors: Mar 13 to Mar 27Transplant outside: May 15 to May 29Sow outdoors: May 15 to May 29
Start indoors: Mar 13 to Mar 27Transplant outside: May 1 to May 15
Sow outdoors: Mar 13 to Apr 3Plant for fall: Aug 1 to Aug 22
Sow outdoors: Mar 13 to Apr 3Plant for fall: Aug 29 to Sep 19
Sow outdoors: Mar 20 to May 1Plant for fall: Sep 12 to Oct 3
Start indoors: Mar 27 to Apr 3Transplant outside: May 8 to May 15Sow outdoors: May 1 to May 15Plant for fall: Aug 8 to Aug 22
Start indoors: Mar 27 to Apr 3Sow outdoors: May 1 to May 15Plant for fall: Aug 15 to Aug 29
Start indoors: Mar 27 to Apr 3Sow outdoors: May 1 to May 15
Start indoors: Mar 27 to Apr 3Transplant outside: May 8 to May 22
Sow outdoors: Apr 3 to May 1Plant for fall: Aug 1 to Aug 15
Sow outdoors: Apr 3 to May 1Plant for fall: Aug 15 to Aug 29
Sow outdoors: Apr 3 to Apr 24
Sow outdoors: Apr 10 to May 8Plant for fall: Aug 15 to Aug 29
Sow outdoors: Apr 10 to May 1Plant for fall: Aug 29 to Sep 19
Sow outdoors: May 1 to May 22Plant for fall: Aug 8 to Aug 22
Sow outdoors: May 1 to May 15
Transplant outside: May 8 to May 29
Plant for fall: Oct 10 to Nov 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Cathlamet, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 30 – Feb 13 | Mar 27 – Apr 10 | — | — |
| Peppers | Feb 13 – Feb 27 | May 8 – May 22 | — | — |
| Eggplant | Feb 13 – Feb 27 | May 8 – May 22 | — | — |
| Tomatoes | Feb 27 – Mar 13 | May 1 – May 15 | — | — |
| Lettuce | Feb 27 – Mar 13 | Apr 3 – Apr 17 | Mar 27 – May 1 | Aug 29 – Sep 26 |
| Kale | Feb 27 – Mar 13 | Mar 27 – Apr 10 | Mar 27 – Apr 10 | Aug 15 – Sep 5 |
| Broccoli | Feb 27 – Mar 13 | Apr 10 – Apr 24 | — | Jul 18 – Aug 8 |
| Cabbage | Feb 27 – Mar 13 | Apr 3 – Apr 17 | — | Jul 18 – Aug 8 |
| Cauliflower | Feb 27 – Mar 13 | Apr 10 – Apr 24 | — | Jul 18 – Aug 8 |
| Okra | Mar 13 – Mar 27 | May 15 – May 29 | May 15 – May 29 | — |
| Basil | Mar 13 – Mar 27 | May 1 – May 15 | — | — |
| Peas | — | — | Mar 13 – Apr 3 | Aug 1 – Aug 22 |
| Spinach | — | — | Mar 13 – Apr 3 | Aug 29 – Sep 19 |
| Radishes | — | — | Mar 20 – May 1 | Sep 12 – Oct 3 |
| Cucumbers | Mar 27 – Apr 3 | May 8 – May 15 | May 1 – May 15 | Aug 8 – Aug 22 |
| Zucchini & Summer Squash | Mar 27 – Apr 3 | — | May 1 – May 15 | Aug 15 – Aug 29 |
| Winter Squash & Pumpkins | Mar 27 – Apr 3 | — | May 1 – May 15 | — |
| Melons & Watermelon | Mar 27 – Apr 3 | May 8 – May 22 | — | — |
| Carrots | — | — | Apr 3 – May 1 | Aug 1 – Aug 15 |
| Beets | — | — | Apr 3 – May 1 | Aug 15 – Aug 29 |
| Potatoes | — | — | Apr 3 – Apr 24 | — |
| Swiss Chard | — | — | Apr 10 – May 8 | Aug 15 – Aug 29 |
| Cilantro | — | — | Apr 10 – May 1 | Aug 29 – Sep 19 |
| Green Beans | — | — | May 1 – May 22 | Aug 8 – Aug 22 |
| Sweet Corn | — | — | May 1 – May 15 | — |
| Sweet Potatoes | — | May 8 – May 29 | — | — |
| Garlic | — | — | — | Oct 10 – Nov 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 Clatskanie, OR weather station, 15 km away (elevation 23 ft (7 m)).
Frost dates near Cathlamet
- Skamokawa Apr 27 · Oct 22
- Grays River Apr 27 · Oct 22
- Rosburg Apr 24 · Oct 20
- Longview Apr 8 · Nov 5
- Ryderwood Apr 5 · Oct 25
- Castle Rock Apr 8 · Nov 5
- Kelso Apr 8 · Nov 5
- Curtis Apr 5 · Oct 25
- Naselle Apr 24 · Oct 20
- Vader Apr 5 · Oct 25
Frequently asked questions
When is the last frost in Cathlamet, WA?
The median last spring frost in Cathlamet, WA is April 24. There is still about a 10% chance of frost after May 9, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Cathlamet, WA?
The median first fall frost is October 24, with about a 10% chance of frost before October 5.
How long is the growing season in Cathlamet, WA?
About 183 days between the median last spring frost and first fall frost.
What planting zone is Cathlamet, WA?
Cathlamet, WA is in USDA hardiness zone 8b.