Troutdale, OR planting zone & frost dates
Troutdale is in USDA hardiness zone 9a. The last spring frost usually comes around March 26 and the first fall frost around November 17, for a growing season of about 237 days.
Planting calendar for Troutdale
Dates are counted from the average last spring frost (March 26) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Jan 29 – Feb 12 Transplant outdoors: Apr 2 – Apr 9 |
| Peppers | Start seeds indoors: Jan 15 – Jan 29 Transplant outdoors: Apr 9 – Apr 16 |
| Eggplant | Start seeds indoors: Jan 15 – Jan 29 Transplant outdoors: Apr 9 – Apr 16 |
| Broccoli | Start seeds indoors: Jan 15 – Jan 29 Transplant outdoors: Feb 26 – Mar 12 |
| Cabbage | Start seeds indoors: Jan 15 – Jan 29 Transplant outdoors: Feb 26 – Mar 12 |
| Onions (sets) | Plant outdoors: Feb 26 – Mar 12 |
| Peas | Sow outdoors: Feb 12 – Feb 26 |
| Spinach | Sow outdoors: Feb 12 – Feb 26 |
| Lettuce | Sow outdoors: Feb 26 – Mar 12 |
| Carrots | Sow outdoors: Feb 26 – Mar 12 |
| Potatoes | Plant outdoors: Feb 26 – Mar 12 |
| Beans | Sow outdoors: Apr 2 – Apr 9 |
| Sweet corn | Sow outdoors: Apr 2 – Apr 9 |
| Cucumbers | Sow outdoors: Apr 2 – Apr 9 |
| Squash & zucchini | Sow outdoors: Apr 2 – Apr 9 |
| Basil | Start seeds indoors: Feb 12 – Feb 26 Transplant outdoors: Apr 2 – Apr 9 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 22 (8 weeks before the average first fall frost on Nov 17).
Useful for zone 9a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Shade cloth — for hot summers
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Feb 27 | Mar 26 | Apr 21 |
| First 32°F frost in fall is before | Dec 10 | Nov 17 | Oct 26 |
How to read it: in spring there is a 10% chance of a frost after April 21, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 26. A hard freeze (28°F) usually ends around February 22.
Hardiness zone by ZIP code in Troutdale
- 97060 zone 9a
Nearby cities
Questions
What growing zone is Troutdale, OR?
Troutdale is in USDA Plant Hardiness Zone 9a (average extreme winter low 20°F to 25°F), according to the USDA 2023 map.
When is the last frost in Troutdale?
The average last spring frost (32°F) in Troutdale is March 26. There is still a 10% chance of frost until April 21.
When can I plant tomatoes in Troutdale?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 2 – Apr 9. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Troutdale, OR (USC00358634), 1.6 km (1.0 mi) from the city center, elevation 10 m, based on 18 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.