When to plant in Cottage Grove, OR
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Cottage Grove, Oregon — all computed from Cottage Grove's nearest NOAA weather station.
Zone 8b means many perennials and even some tender shrubs overwinter in Cottage Grove, while your frost dates still decide when annuals go out.
Frost probability
COTTAGE GROVE 2E · 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 Cottage Grove’s own odds, recorded at COTTAGE GROVE 2E.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 30 | May 12 | Apr 26 | Sep 7 | Oct 1 | Oct 26 |
| 32°F | May 10 | Apr 24 | Mar 31 | Sep 30 | Oct 25 | Nov 16 |
| 28°F | Apr 22 | Mar 23 | Feb 21 | Oct 21 | Nov 18 | 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 Cottage Grove, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 9 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.
Cottage Grove planting FAQ
When is the last spring frost in Cottage Grove, OR?
Cottage Grove's average last spring frost falls near April 24 — 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 Cottage Grove, OR?
In Cottage Grove, the first 32°F freeze of fall lands around October 25 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Cottage Grove in?
Cottage Grove is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Cottage Grove?
There are roughly 184 frost-free days in Cottage Grove (a moderate growing season), running from the average last frost around April 24 to the first fall frost near October 25.
When should I plant tomatoes in Cottage Grove?
In Cottage Grove, start tomato seeds indoors around February 27–March 13, then transplant seedlings outdoors around May 1 once the danger of frost has passed.
Never miss a window in Cottage Grove
An email when it’s time to start seeds, transplant, and sow — timed to Cottage Grove’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Springfield · 29 km
- Eugene · 29 km
- Santa Clara · 36 km
- Roseburg · 68 km
- Sweet Home · 73 km
- Lebanon · 83 km
- Corvallis · 88 km
- Albany · 92 km
Frost dates recorded at COTTAGE GROVE 2E, 2 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 Cottage Grove, OR — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00351897. Retrieved from https://blissgarden.com/oregon/cottage-grove.