When to plant in Coos Bay, OR
USDA Zone 9aEverything below — frost dates, hardiness zone, and what to plant when in Coos Bay, Oregon — is derived from the closest NOAA station with complete climate normals.
A generous ~291-day season lets Coos Bay gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. In zone 9a, frost is a minor factor for Coos Bay — most perennials thrive, and annual vegetables can go out early and stay late.
The average last spring frost in Coos Bay is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
NORTH BEND RGNL AP · 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 Coos Bay’s own odds, recorded at NORTH BEND RGNL AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 1 | Apr 2 | Mar 1 | Oct 24 | Nov 15 | Dec 11 |
| 32°F | Mar 25 | Feb 21 | Dec 31 | Nov 12 | Dec 9 | Jan 28 |
| 28°F | Feb 22 | Jan 4 | Dec 3 | Nov 25 | Dec 22 | Feb 15 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in Coos Bay, 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.
Coos Bay planting FAQ
When is the last spring frost in Coos Bay, OR?
On average, the last spring frost in Coos Bay is around February 21 (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 Coos Bay, OR?
In Coos Bay, the first 32°F freeze of fall lands around December 9 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Coos Bay in?
Coos Bay is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Coos Bay?
Coos Bay has about 291 frost-free days — a long growing season — between the average last spring frost (February 21) and first fall frost (December 9).
When should I plant tomatoes in Coos Bay?
For Coos Bay, sow tomatoes indoors about December 27–January 10 and move the seedlings out around February 28, after the last spring frost.
Never miss a window in Coos Bay
An email when it’s time to start seeds, transplant, and sow — timed to Coos Bay’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- North Bend · 3 km
- Roseburg · 73 km
- Cottage Grove · 105 km
- Eugene · 117 km
- Santa Clara · 120 km
- Springfield · 125 km
- Grants Pass · 129 km
- Newport · 139 km
Frost dates recorded at NORTH BEND RGNL AP, 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 Coos Bay, OR — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024284. Retrieved from https://blissgarden.com/oregon/coos-bay.