Troutdale, OR frost dates
Last spring frostMar 26median date
First fall frostNov 17median date
Growing season236 daysfrost-free
Hardiness zone9aZone 9a
How Troutdale compares
- In 8 years out of 10, the last spring frost in Troutdale falls between February 27 and April 21, a 53-day window. The first fall frost falls between October 26 and December 10.
- The median last frost is 21 days earlier than the Oregon median of Apr 16.
- Its 236-day growing season is longer than 79% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 23 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 40 nights a year at or below 32°F.
- Compared with Gresham, OR, 5 km away, the last frost here is 10 days later than there and the growing season is 13 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 27 |
| 50% (median) | March 26 |
| 10% (safe for tender plants) | April 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 26 |
| 50% (median) | November 17 |
| 90% (late) | December 10 |
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 Troutdale, OR
Troutdale, OR frost dates — last frost Mar 26, first frost Nov 17, zone 9a. whenisthelastfrost.com
Crop
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Start indoors: Jan 1 to Jan 15Transplant outside: Feb 26 to Mar 12
Start indoors: Jan 15 to Jan 29Transplant outside: Apr 9 to Apr 23
Start indoors: Jan 15 to Jan 29Transplant outside: Apr 9 to Apr 23
Start indoors: Jan 29 to Feb 12Transplant outside: Apr 2 to Apr 16
Start indoors: Jan 29 to Feb 12Transplant outside: Mar 5 to Mar 19Sow outdoors: Feb 26 to Apr 2Plant for fall: Sep 22 to Oct 20
Start indoors: Jan 29 to Feb 12Transplant outside: Feb 26 to Mar 12Sow outdoors: Feb 26 to Mar 12Plant for fall: Sep 8 to Sep 29
Start indoors: Jan 29 to Feb 12Transplant outside: Mar 12 to Mar 26Plant for fall: Aug 11 to Sep 1
Start indoors: Jan 29 to Feb 12Transplant outside: Mar 5 to Mar 19Plant for fall: Aug 11 to Sep 1
Start indoors: Jan 29 to Feb 12Transplant outside: Mar 12 to Mar 26Plant for fall: Aug 11 to Sep 1
Start indoors: Feb 12 to Feb 26Transplant outside: Apr 16 to Apr 30Sow outdoors: Apr 16 to Apr 30
Start indoors: Feb 12 to Feb 26Transplant outside: Apr 2 to Apr 16
Sow outdoors: Feb 12 to Mar 5Plant for fall: Aug 25 to Sep 15
Sow outdoors: Feb 12 to Mar 5Plant for fall: Sep 22 to Oct 13
Sow outdoors: Feb 19 to Apr 2Plant for fall: Oct 6 to Oct 27
Start indoors: Feb 26 to Mar 5Transplant outside: Apr 9 to Apr 16Sow outdoors: Apr 2 to Apr 16Plant for fall: Sep 1 to Sep 15
Start indoors: Feb 26 to Mar 5Sow outdoors: Apr 2 to Apr 16Plant for fall: Sep 8 to Sep 22
Start indoors: Feb 26 to Mar 5Sow outdoors: Apr 2 to Apr 16
Start indoors: Feb 26 to Mar 5Transplant outside: Apr 9 to Apr 23
Sow outdoors: Mar 5 to Apr 2Plant for fall: Aug 25 to Sep 8
Sow outdoors: Mar 5 to Apr 2Plant for fall: Sep 8 to Sep 22
Sow outdoors: Mar 5 to Mar 26
Sow outdoors: Mar 12 to Apr 9Plant for fall: Sep 8 to Sep 22
Sow outdoors: Mar 12 to Apr 2Plant for fall: Sep 22 to Oct 13
Sow outdoors: Apr 2 to Apr 23Plant for fall: Sep 1 to Sep 15
Sow outdoors: Apr 2 to Apr 16
Transplant outside: Apr 9 to Apr 30
Plant for fall: Nov 3 to Dec 8
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Troutdale, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 1 – Jan 15 | Feb 26 – Mar 12 | — | — |
| Peppers | Jan 15 – Jan 29 | Apr 9 – Apr 23 | — | — |
| Eggplant | Jan 15 – Jan 29 | Apr 9 – Apr 23 | — | — |
| Tomatoes | Jan 29 – Feb 12 | Apr 2 – Apr 16 | — | — |
| Lettuce | Jan 29 – Feb 12 | Mar 5 – Mar 19 | Feb 26 – Apr 2 | Sep 22 – Oct 20 |
| Kale | Jan 29 – Feb 12 | Feb 26 – Mar 12 | Feb 26 – Mar 12 | Sep 8 – Sep 29 |
| Broccoli | Jan 29 – Feb 12 | Mar 12 – Mar 26 | — | Aug 11 – Sep 1 |
| Cabbage | Jan 29 – Feb 12 | Mar 5 – Mar 19 | — | Aug 11 – Sep 1 |
| Cauliflower | Jan 29 – Feb 12 | Mar 12 – Mar 26 | — | Aug 11 – Sep 1 |
| Okra | Feb 12 – Feb 26 | Apr 16 – Apr 30 | Apr 16 – Apr 30 | — |
| Basil | Feb 12 – Feb 26 | Apr 2 – Apr 16 | — | — |
| Peas | — | — | Feb 12 – Mar 5 | Aug 25 – Sep 15 |
| Spinach | — | — | Feb 12 – Mar 5 | Sep 22 – Oct 13 |
| Radishes | — | — | Feb 19 – Apr 2 | Oct 6 – Oct 27 |
| Cucumbers | Feb 26 – Mar 5 | Apr 9 – Apr 16 | Apr 2 – Apr 16 | Sep 1 – Sep 15 |
| Zucchini & Summer Squash | Feb 26 – Mar 5 | — | Apr 2 – Apr 16 | Sep 8 – Sep 22 |
| Winter Squash & Pumpkins | Feb 26 – Mar 5 | — | Apr 2 – Apr 16 | — |
| Melons & Watermelon | Feb 26 – Mar 5 | Apr 9 – Apr 23 | — | — |
| Carrots | — | — | Mar 5 – Apr 2 | Aug 25 – Sep 8 |
| Beets | — | — | Mar 5 – Apr 2 | Sep 8 – Sep 22 |
| Potatoes | — | — | Mar 5 – Mar 26 | — |
| Swiss Chard | — | — | Mar 12 – Apr 9 | Sep 8 – Sep 22 |
| Cilantro | — | — | Mar 12 – Apr 2 | Sep 22 – Oct 13 |
| Green Beans | — | — | Apr 2 – Apr 23 | Sep 1 – Sep 15 |
| Sweet Corn | — | — | Apr 2 – Apr 16 | — |
| Sweet Potatoes | — | Apr 9 – Apr 30 | — | — |
| Garlic | — | — | — | Nov 3 – Dec 8 |
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 Troutdale, OR weather station, 3 km away (elevation 33 ft (10 m)).
Frost dates near Troutdale
- Gresham Mar 16 · Nov 20
- Fairview Mar 16 · Nov 20
- Corbett Mar 27 · Nov 18
- Boring Mar 16 · Nov 20
- Damascus Mar 18 · Nov 18
- Happy Valley Mar 18 · Nov 18
- Clackamas Mar 18 · Nov 18
- Eagle Creek Mar 27 · Nov 14
- Sandy Mar 27 · Nov 18
- Bridal Veil Apr 29 · Oct 22
Frequently asked questions
When is the last frost in Troutdale, OR?
The median last spring frost in Troutdale, OR is March 26. There is still about a 10% chance of frost after April 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Troutdale, OR?
The median first fall frost is November 17, with about a 10% chance of frost before October 26.
How long is the growing season in Troutdale, OR?
About 236 days between the median last spring frost and first fall frost.
What planting zone is Troutdale, OR?
Troutdale, OR is in USDA hardiness zone 9a.