When to plant in Port Orchard, WA
USDA Zone 9aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Port Orchard, Washington — all computed from Port Orchard's nearest NOAA weather station.
In zone 9a, frost is a minor factor for Port Orchard — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
BREMERTON · 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 Port Orchard’s own odds, recorded at BREMERTON.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 13 | Apr 25 | Apr 7 | Oct 4 | Oct 27 | Nov 13 |
| 32°F | Apr 24 | Mar 29 | Mar 5 | Oct 26 | Nov 14 | Dec 1 |
| 28°F | Mar 27 | Feb 27 | Jan 24 | Nov 10 | Nov 30 | Dec 24 |
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 Port Orchard, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 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.
Port Orchard planting FAQ
When is the last spring frost in Port Orchard, WA?
Port Orchard's average last spring frost falls near March 29 — 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 Port Orchard, WA?
The first fall frost in Port Orchard typically arrives around November 14 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Port Orchard in?
Port Orchard is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Port Orchard?
Port Orchard has about 230 frost-free days — a long growing season — between the average last spring frost (March 29) and first fall frost (November 14).
When should I plant tomatoes in Port Orchard?
For Port Orchard, sow tomatoes indoors about February 1–February 15 and move the seedlings out around April 5, after the last spring frost.
Never miss a window in Port Orchard
An email when it’s time to start seeds, transplant, and sow — timed to Port Orchard’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Bremerton · 6 km
- Silverdale · 15 km
- Bainbridge Island · 15 km
- White Center · 22 km
- Gig Harbor · 22 km
- Poulsbo · 23 km
- Burien · 23 km
- Seattle · 23 km
Frost dates recorded at BREMERTON, 5 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 Port Orchard, WA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00450872. Retrieved from https://blissgarden.com/washington/port-orchard.