When to plant in Bainbridge Island, WA
USDA Zone 9aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Bainbridge Island, Washington — all computed from Bainbridge Island's nearest NOAA weather station.
These dates come from a station roughly 15 km away, the closest with full normals; terrain around Bainbridge Island (elevation, water, pavement) can move your real frost dates a few days either way. Zone 9a is warm enough that Bainbridge Island can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
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 Bainbridge Island’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 Bainbridge Island, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Bainbridge Island planting FAQ
When is the last spring frost in Bainbridge Island, WA?
Plan for the last spring frost in Bainbridge Island around March 29 (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 Bainbridge Island, WA?
In Bainbridge Island, the first 32°F freeze of fall lands around November 14 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Bainbridge Island in?
Bainbridge Island is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Bainbridge Island?
There are roughly 230 frost-free days in Bainbridge Island (a long growing season), running from the average last frost around March 29 to the first fall frost near November 14.
When should I plant tomatoes in Bainbridge Island?
In Bainbridge Island, start tomato seeds indoors around February 1–February 15, then transplant seedlings outdoors around April 5 once the danger of frost has passed.
Never miss a window in Bainbridge Island
An email when it’s time to start seeds, transplant, and sow — timed to Bainbridge Island’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Seattle · 12 km
- Silverdale · 13 km
- Port Orchard · 15 km
- Poulsbo · 15 km
- Shoreline · 18 km
- White Center · 19 km
- Bremerton · 19 km
- Lake Forest Park · 21 km
Frost dates recorded at BREMERTON, 15 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 Bainbridge Island, WA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00450872. Retrieved from https://blissgarden.com/washington/bainbridge-island.