When to plant in Tualatin, OR
USDA Zone 9aTualatin, Oregon frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 9a, frost is a minor factor for Tualatin — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
BEAVERTON 2 SSW · 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 Tualatin’s own odds, recorded at BEAVERTON 2 SSW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 16 | Apr 28 | Apr 11 | Oct 4 | Oct 21 | Nov 7 |
| 32°F | Apr 26 | Apr 1 | Mar 5 | Oct 19 | Nov 6 | Dec 1 |
| 28°F | Mar 26 | Feb 26 | Jan 23 | Nov 6 | Nov 30 | Dec 27 |
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 Tualatin, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Tualatin planting FAQ
When is the last spring frost in Tualatin, OR?
Plan for the last spring frost in Tualatin around April 1 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Tualatin, OR?
Expect Tualatin's first fall frost near November 6 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Tualatin in?
Tualatin is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Tualatin?
Tualatin has about 219 frost-free days — a long growing season — between the average last spring frost (April 1) and first fall frost (November 6).
When should I plant tomatoes in Tualatin?
For Tualatin, sow tomatoes indoors about February 4–February 18 and move the seedlings out around April 8, after the last spring frost.
Never miss a window in Tualatin
An email when it’s time to start seeds, transplant, and sow — timed to Tualatin’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Tigard · 5 km
- Sherwood · 6 km
- Lake Oswego · 7 km
- Wilsonville · 7 km
- West Linn · 11 km
- Oak Grove · 12 km
- Beaverton · 12 km
- Canby · 14 km
Frost dates recorded at BEAVERTON 2 SSW, 9 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 Tualatin, OR — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00350595. Retrieved from https://blissgarden.com/oregon/tualatin.