Woodburn, OR planting zone & frost dates
Woodburn is in USDA hardiness zone 8b. The last spring frost usually comes around March 16 and the first fall frost around November 14, for a growing season of about 242 days.
Planting calendar for Woodburn
Dates are counted from the average last spring frost (March 16) 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 19 – Feb 2 Transplant outdoors: Mar 23 – Mar 30 |
| Peppers | Start seeds indoors: Jan 5 – Jan 19 Transplant outdoors: Mar 30 – Apr 6 |
| Eggplant | Start seeds indoors: Jan 5 – Jan 19 Transplant outdoors: Mar 30 – Apr 6 |
| Broccoli | Start seeds indoors: Jan 5 – Jan 19 Transplant outdoors: Feb 16 – Mar 2 |
| Cabbage | Start seeds indoors: Jan 5 – Jan 19 Transplant outdoors: Feb 16 – Mar 2 |
| Onions (sets) | Plant outdoors: Feb 16 – Mar 2 |
| Peas | Sow outdoors: Feb 2 – Feb 16 |
| Spinach | Sow outdoors: Feb 2 – Feb 16 |
| Lettuce | Sow outdoors: Feb 16 – Mar 2 |
| Carrots | Sow outdoors: Feb 16 – Mar 2 |
| Potatoes | Plant outdoors: Feb 16 – Mar 2 |
| Beans | Sow outdoors: Mar 23 – Mar 30 |
| Sweet corn | Sow outdoors: Mar 23 – Mar 30 |
| Cucumbers | Sow outdoors: Mar 23 – Mar 30 |
| Squash & zucchini | Sow outdoors: Mar 23 – Mar 30 |
| Basil | Start seeds indoors: Feb 2 – Feb 16 Transplant outdoors: Mar 23 – Mar 30 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 19 (8 weeks before the average first fall frost on Nov 14).
Useful for zone 8b 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
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Feb 21 | Mar 16 | Apr 7 |
| First 32°F frost in fall is before | Dec 6 | Nov 14 | Oct 27 |
How to read it: in spring there is a 10% chance of a frost after April 7, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 27. A hard freeze (28°F) usually ends around February 15.
Hardiness zone by ZIP code in Woodburn
- 97071 zone 8b
Nearby cities
- Wilsonville zone 8b, last frost Mar 18
- Newberg zone 8b, last frost Mar 21
- Canby zone 8b, last frost Mar 18
- Hayesville zone 8b, last frost Apr 3
- Sherwood zone 8b, last frost Mar 21
- Keizer zone 8b, last frost Apr 3
- Four Corners zone 8b, last frost Apr 3
- Tualatin zone 9a, last frost Apr 1
Questions
What growing zone is Woodburn, OR?
Woodburn is in USDA Plant Hardiness Zone 8b (average extreme winter low 15°F to 20°F), according to the USDA 2023 map.
When is the last frost in Woodburn?
The average last spring frost (32°F) in Woodburn is March 16. There is still a 10% chance of frost until April 7.
When can I plant tomatoes in Woodburn?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 23 – Mar 30. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Aurora State Ap, OR (USW00094281), 13.5 km (8.4 mi) from the city center, elevation 60 m, based on 23 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.