When to plant in Silverton, OR
USDA Zone 8bEverything below — frost dates, hardiness zone, and what to plant when in Silverton, Oregon — is derived from the closest NOAA station with complete climate normals.
Zone 8b means many perennials and even some tender shrubs overwinter in Silverton, while your frost dates still decide when annuals go out.
Frost probability
SILVERTON · 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 Silverton’s own odds, recorded at SILVERTON.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 11 | Apr 25 | Apr 5 | Oct 9 | Oct 26 | Nov 11 |
| 32°F | Apr 19 | Mar 28 | Mar 1 | Oct 25 | Nov 10 | Dec 1 |
| 28°F | Mar 23 | Feb 25 | Jan 18 | Nov 4 | Nov 28 | Dec 24 |
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 Silverton, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Silverton planting FAQ
When is the last spring frost in Silverton, OR?
On average, the last spring frost in Silverton is around March 28 (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 Silverton, OR?
Expect Silverton's first fall frost near November 10 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Silverton in?
Silverton is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Silverton?
There are roughly 227 frost-free days in Silverton (a long growing season), running from the average last frost around March 28 to the first fall frost near November 10.
When should I plant tomatoes in Silverton?
In Silverton, start tomato seeds indoors around January 31–February 14, then transplant seedlings outdoors around April 4 once the danger of frost has passed.
Never miss a window in Silverton
An email when it’s time to start seeds, transplant, and sow — timed to Silverton’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Hayesville · 15 km
- Woodburn · 17 km
- Four Corners · 17 km
- Keizer · 19 km
- Salem · 21 km
- Molalla · 22 km
- Canby · 30 km
- Wilsonville · 34 km
Frost dates recorded at SILVERTON, 1 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 Silverton, OR — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00357823. Retrieved from https://blissgarden.com/oregon/silverton.