When to plant in Ridgefield, WA
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Ridgefield, Washington — all computed from Ridgefield's nearest NOAA weather station.
In zone 8b, Ridgefield supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
BATTLE GROUND · 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 Ridgefield’s own odds, recorded at BATTLE GROUND.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 31 | May 13 | Apr 29 | Sep 11 | Sep 30 | Oct 19 |
| 32°F | May 12 | Apr 26 | Apr 5 | Sep 29 | Oct 16 | Nov 10 |
| 28°F | Apr 23 | Mar 29 | Mar 4 | Oct 16 | Nov 5 | Nov 30 |
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 Ridgefield, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Ridgefield planting FAQ
When is the last spring frost in Ridgefield, WA?
Plan for the last spring frost in Ridgefield around April 26 (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 Ridgefield, WA?
In Ridgefield, the first 32°F freeze of fall lands around October 16 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Ridgefield in?
Ridgefield is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Ridgefield?
Ridgefield has about 173 frost-free days — a moderate growing season — between the average last spring frost (April 26) and first fall frost (October 16).
When should I plant tomatoes in Ridgefield?
For Ridgefield, sow tomatoes indoors about March 1–March 15 and move the seedlings out around May 3, after the last spring frost.
Never miss a window in Ridgefield
An email when it’s time to start seeds, transplant, and sow — timed to Ridgefield’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Mount Vista · 9 km
- Battle Ground · 11 km
- Felida · 12 km
- Salmon Creek · 12 km
- St. Helens · 12 km
- Hazel Dell · 15 km
- Five Corners · 16 km
- Orchards · 18 km
Frost dates recorded at BATTLE GROUND, 12 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 Ridgefield, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00450482. Retrieved from https://blissgarden.com/washington/ridgefield.