When to plant in Keizer, OR
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Keizer, Oregon — all computed from Keizer's nearest NOAA weather station.
Zone 8b means many perennials and even some tender shrubs overwinter in Keizer, while your frost dates still decide when annuals go out.
The average last spring frost in Keizer is now 15 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
SALEM MCNARY FLD · 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 Keizer’s own odds, recorded at SALEM MCNARY FLD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 16 | Apr 30 | Apr 14 | Oct 2 | Oct 18 | Nov 2 |
| 32°F | Apr 27 | Apr 3 | Mar 10 | Oct 16 | Nov 1 | Nov 23 |
| 28°F | Mar 30 | Mar 2 | Jan 31 | Oct 30 | Nov 22 | Dec 17 |
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 Keizer, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Keizer planting FAQ
When is the last spring frost in Keizer, OR?
Plan for the last spring frost in Keizer around April 3 (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 Keizer, OR?
In Keizer, the first 32°F freeze of fall lands around November 1 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Keizer in?
Keizer is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Keizer?
There are roughly 212 frost-free days in Keizer (a long growing season), running from the average last frost around April 3 to the first fall frost near November 1.
When should I plant tomatoes in Keizer?
In Keizer, start tomato seeds indoors around February 6–February 20, then transplant seedlings outdoors around April 10 once the danger of frost has passed.
Never miss a window in Keizer
An email when it’s time to start seeds, transplant, and sow — timed to Keizer’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Hayesville · 5 km
- Salem · 9 km
- Four Corners · 9 km
- Silverton · 19 km
- Woodburn · 21 km
- Independence · 21 km
- Monmouth · 23 km
- Dallas · 24 km
Frost dates recorded at SALEM MCNARY FLD, 11 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 Keizer, OR — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024232. Retrieved from https://blissgarden.com/oregon/keizer.