When to plant in Oak Hills, OR
USDA Zone 8bEverything below — frost dates, hardiness zone, and what to plant when in Oak Hills, Oregon — is derived from the closest NOAA station with complete climate normals.
A generous ~297-day season lets Oak Hills gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. In zone 8b, Oak Hills supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
NATURE PARK-BEAVERTON · 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 Oak Hills’s own odds, recorded at NATURE PARK-BEAVERTON.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 15 | Mar 23 | Feb 25 | Oct 26 | Nov 13 | Dec 4 |
| 32°F | Mar 5 | Feb 11 | Dec 26 | Nov 11 | Dec 5 | Jan 12 |
| 28°F | Feb 16 | Jan 6 | Dec 2 | Nov 24 | Dec 21 | Feb 5 |
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 Oak Hills, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 10 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.
Oak Hills planting FAQ
When is the last spring frost in Oak Hills, OR?
Oak Hills's average last spring frost falls near February 11 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Oak Hills, OR?
The first fall frost in Oak Hills typically arrives around December 5 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Oak Hills in?
Oak Hills is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Oak Hills?
Oak Hills has about 297 frost-free days — a long growing season — between the average last spring frost (February 11) and first fall frost (December 5).
When should I plant tomatoes in Oak Hills?
For Oak Hills, sow tomatoes indoors about December 17–December 31 and move the seedlings out around February 18, after the last spring frost.
Never miss a window in Oak Hills
An email when it’s time to start seeds, transplant, and sow — timed to Oak Hills’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at NATURE PARK-BEAVERTON, 5 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 Oak Hills, OR — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00355945. Retrieved from https://blissgarden.com/oregon/oak-hills.