When to plant in Astoria, OR
USDA Zone 9aAstoria, Oregon frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 9a, frost is a minor factor for Astoria — most perennials thrive, and annual vegetables can go out early and stay late.
The average last spring frost in Astoria is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
ASTORIA 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 Astoria’s own odds, recorded at ASTORIA RGNL AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 10 | Apr 25 | Apr 3 | Oct 5 | Oct 23 | Nov 11 |
| 32°F | Apr 18 | Mar 26 | Feb 27 | Oct 22 | Nov 11 | Dec 8 |
| 28°F | Mar 17 | Feb 18 | Dec 31 | Nov 9 | Dec 5 | Jan 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 Astoria, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 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.
Astoria planting FAQ
When is the last spring frost in Astoria, OR?
Plan for the last spring frost in Astoria around March 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 Astoria, OR?
The first fall frost in Astoria typically arrives around November 11 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Astoria in?
Astoria is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Astoria?
Astoria has about 230 frost-free days — a long growing season — between the average last spring frost (March 26) and first fall frost (November 11).
When should I plant tomatoes in Astoria?
For Astoria, sow tomatoes indoors about January 29–February 12 and move the seedlings out around April 2, after the last spring frost.
Never miss a window in Astoria
An email when it’s time to start seeds, transplant, and sow — timed to Astoria’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Longview · 66 km
- Kelso · 72 km
- St. Helens · 85 km
- Aberdeen · 88 km
- Centralia · 88 km
- Forest Grove · 92 km
- Cornelius · 95 km
- Ridgefield · 97 km
Frost dates recorded at ASTORIA RGNL AP, 6 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 Astoria, OR — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094224. Retrieved from https://blissgarden.com/oregon/astoria.