When to plant in Corvallis, OR
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Corvallis, Oregon — all computed from Corvallis's nearest NOAA weather station.
Zone 8b means many perennials and even some tender shrubs overwinter in Corvallis, while your frost dates still decide when annuals go out.
Frost probability
CORVALLIS STATE UNIV · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Corvallis’s own odds, recorded at CORVALLIS STATE UNIV.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 2 | May 11 | Apr 25 | Sep 23 | Oct 10 | Oct 28 |
| 32°F | May 8 | Apr 17 | Mar 22 | Oct 5 | Oct 28 | Nov 19 |
| 28°F | Apr 5 | Mar 1 | Jan 25 | Oct 22 | Nov 17 | Dec 18 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Corvallis, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Corvallis planting FAQ
When is the last spring frost in Corvallis, OR?
On average, the last spring frost in Corvallis is around April 17 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Corvallis, OR?
Expect Corvallis's first fall frost near October 28 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Corvallis in?
Corvallis is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Corvallis?
There are roughly 194 frost-free days in Corvallis (a moderate growing season), running from the average last frost around April 17 to the first fall frost near October 28.
When should I plant tomatoes in Corvallis?
In Corvallis, start tomato seeds indoors around February 20–March 6, then transplant seedlings outdoors around April 24 once the danger of frost has passed.
Never miss a window in Corvallis
An email when it’s time to start seeds, transplant, and sow — timed to Corvallis’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Albany · 16 km
- Lebanon · 30 km
- Monmouth · 32 km
- Independence · 33 km
- Dallas · 39 km
- Salem · 44 km
- Four Corners · 47 km
- Sweet Home · 49 km
Frost dates recorded at CORVALLIS STATE UNIV, 10 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Corvallis, OR — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00351862. Retrieved from https://blissgarden.com/oregon/corvallis.