Roseburg, OR planting zone & frost dates
Roseburg is in USDA hardiness zone 8b. The last spring frost usually comes around March 23 and the first fall frost around November 18, for a growing season of about 237 days.
Planting calendar for Roseburg
Dates are counted from the average last spring frost (March 23) 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 26 – Feb 9 Transplant outdoors: Mar 30 – Apr 6 |
| Peppers | Start seeds indoors: Jan 12 – Jan 26 Transplant outdoors: Apr 6 – Apr 13 |
| Eggplant | Start seeds indoors: Jan 12 – Jan 26 Transplant outdoors: Apr 6 – Apr 13 |
| Broccoli | Start seeds indoors: Jan 12 – Jan 26 Transplant outdoors: Feb 23 – Mar 9 |
| Cabbage | Start seeds indoors: Jan 12 – Jan 26 Transplant outdoors: Feb 23 – Mar 9 |
| Onions (sets) | Plant outdoors: Feb 23 – Mar 9 |
| Peas | Sow outdoors: Feb 9 – Feb 23 |
| Spinach | Sow outdoors: Feb 9 – Feb 23 |
| Lettuce | Sow outdoors: Feb 23 – Mar 9 |
| Carrots | Sow outdoors: Feb 23 – Mar 9 |
| Potatoes | Plant outdoors: Feb 23 – Mar 9 |
| Beans | Sow outdoors: Mar 30 – Apr 6 |
| Sweet corn | Sow outdoors: Mar 30 – Apr 6 |
| Cucumbers | Sow outdoors: Mar 30 – Apr 6 |
| Squash & zucchini | Sow outdoors: Mar 30 – Apr 6 |
| Basil | Start seeds indoors: Feb 9 – Feb 23 Transplant outdoors: Mar 30 – Apr 6 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 23 (8 weeks before the average first fall frost on Nov 18).
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 25 | Mar 23 | Apr 16 |
| First 32°F frost in fall is before | Dec 17 | Nov 18 | Oct 24 |
How to read it: in spring there is a 10% chance of a frost after April 16, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 24. A hard freeze (28°F) usually ends around February 20.
Hardiness zone by ZIP code in Roseburg
- 97470 zone 8b
- 97471 zone 9a
Nearby cities
- Grants Pass zone 8b, last frost Apr 8
- Eugene zone 8b, last frost Apr 11
- Coos Bay zone 9a, last frost Feb 21
- Springfield zone 8b, last frost Apr 11
- Central Point zone 8b, last frost Apr 8
- Medford zone 8b, last frost Apr 8
- Ashland zone 8a, last frost May 6
- Corvallis zone 8b, last frost Apr 17
Questions
What growing zone is Roseburg, OR?
Roseburg is in USDA Plant Hardiness Zone 8b (average extreme winter low 15°F to 20°F), according to the USDA 2023 map. Some ZIP codes of the city fall in zone 9a.
When is the last frost in Roseburg?
The average last spring frost (32°F) in Roseburg is March 23. There is still a 10% chance of frost until April 16.
When can I plant tomatoes in Roseburg?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 30 – Apr 6. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Roseburg Kqen, OR (USC00357331), 2.0 km (1.2 mi) from the city center, elevation 130 m, based on 26 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.