When to plant in Newberg, OR
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Newberg, Oregon — all computed from Newberg's nearest NOAA weather station.
A generous ~246-day season lets Newberg gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. Zone 8b means many perennials and even some tender shrubs overwinter in Newberg, while your frost dates still decide when annuals go out.
Frost probability
REX 1 S · 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 Newberg’s own odds, recorded at REX 1 S.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 6 | Apr 21 | Mar 30 | Oct 20 | Nov 3 | Nov 22 |
| 32°F | Apr 19 | Mar 21 | Feb 23 | Nov 4 | Nov 22 | Dec 12 |
| 28°F | Mar 11 | Feb 15 | Jan 3 | Nov 15 | Dec 10 | Jan 12 |
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 Newberg, 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.
Newberg planting FAQ
When is the last spring frost in Newberg, OR?
Newberg's average last spring frost falls near March 21 — 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 Newberg, OR?
The first fall frost in Newberg typically arrives around November 22 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Newberg in?
Newberg is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Newberg?
There are roughly 246 frost-free days in Newberg (a long growing season), running from the average last frost around March 21 to the first fall frost near November 22.
When should I plant tomatoes in Newberg?
In Newberg, start tomato seeds indoors around January 24–February 7, then transplant seedlings outdoors around March 28 once the danger of frost has passed.
Never miss a window in Newberg
An email when it’s time to start seeds, transplant, and sow — timed to Newberg’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Sherwood · 11 km
- Wilsonville · 15 km
- Tualatin · 16 km
- Tigard · 19 km
- Woodburn · 19 km
- McMinnville · 21 km
- Aloha · 22 km
- Canby · 22 km
Frost dates recorded at REX 1 S, 4 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 Newberg, OR — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00357127. Retrieved from https://blissgarden.com/oregon/newberg.