Oregon planting calendar
When to plant tomatoes in Oregon — sow, transplant & harvest dates
Oregon is mostly USDA zone 8b (range 4b-9b). Dates below are derived from tomatoes's frost tolerance and Oregon's frost window — not generic national averages.
Tomatoes planting timetable for Oregon
| Stage | When in Oregon | Anchor |
|---|---|---|
| Start seeds indoors | early March (March 4) | 6 weeks before the last frost (mid-April (Willamette Valley)) |
| Transplant outside | late April (April 25) | 10 days after the last frost (mid-April (Willamette Valley)) |
| First harvest (estimate) | early July (July 9) | ~75 days from transplant |
Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.
Why Oregon's climate shifts the tomatoes dates
Oregon's last spring frost averages mid-April (Willamette Valley) and first fall frost early November (Willamette Valley), which sets the whole planting clock. Oregon is split by the Cascades: a mild, wet, long-season west and a cold, dry, short-season high desert east. Wait for warm soil — tomatoes stall in cold ground even after the air warms, so don't rush them out.
Wait until soil has warmed to at least 16 °C and night temperatures stay above 10 °C. Tomatoes set fruit poorly below 13 °C at night and stop above 32 °C, which is why hot-zone gardeners run a spring + fall crop instead of one long summer.
Frost-risk note
Don't plant before mid-April (Willamette Valley) — even a light frost will kill seedlings overnight. In the high desert and Cascades east of the mountains (zone 4b) the safe date runs a week or two later.
Regional variation within Oregon
the high desert and Cascades east of the mountains (zone 4b) runs roughly 1-2 weeks behind the state average; the Willamette Valley and southwest interior (zone 9b) can plant 1-2 weeks earlier.
- Portland — USDA zone 9a
- Eugene — USDA zone 8b
- Salem — USDA zone 8b
- Bend — USDA zone 6b
- Medford — USDA zone 8a
What else to plant in Oregon around then
Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.
Quick-grow guide
- Sun: Full sun — 6+ hours direct.
- Soil temperature for germination: 21-27 °C (70-80 °F).
- Spacing: 24-36 inches (60-90 cm) between plants.
- Days to harvest: ~75 days from planting out.
Frequently asked questions
When is the best time to plant tomatoes in Oregon?
In Oregon (mostly USDA zone 8b), sow tomatoes indoors around early March, transplant outdoors late April (after the last frost, mid-April), and harvest from early July. Tomatoes are frost-tender — a single light frost kills seedlings, so they only go outside once frost danger has fully passed and the soil is warm.
What USDA zone is Oregon?
Most of Oregon sits in USDA hardiness zone 8b, with the state spanning roughly 4b-9b from the high desert and Cascades east of the mountains (zone 4b) to the Willamette Valley and southwest interior (zone 9b). The last spring frost averages mid-April (Willamette Valley) and the first fall frost early November (Willamette Valley).
Can you grow tomatoes in Oregon?
Yes. Oregon's dominant zone 8b supports tomatoes — the key is timing. Tomatoes are frost-tender — a single light frost kills seedlings, so they only go outside once frost danger has fully passed and the soil is warm.
Does the planting date change across Oregon?
the high desert and Cascades east of the mountains (zone 4b) runs roughly 1-2 weeks behind the state average; the Willamette Valley and southwest interior (zone 9b) can plant 1-2 weeks earlier.
What else can I plant in Oregon around the same time?
Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.
Source and methodology
State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.
Keep going
- How to grow tomatoes — full guide
- When to plant tomatoes — the deep dive
- USDA zone 8 — frost dates and what else to plant
- Average frost dates by zone
- Frost-date calculator
- Month-by-month planting calendar
- When to plant tomatoes in every US state
Same crop, nearby states (Pacific)
- When to plant tomatoes in Alaska
- When to plant tomatoes in California
- When to plant tomatoes in Hawaii
- When to plant tomatoes in Washington