When to plant in Maple Valley, WA
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Maple Valley, Washington — all computed from Maple Valley's nearest NOAA weather station.
Zone 8b means many perennials and even some tender shrubs overwinter in Maple Valley, while your frost dates still decide when annuals go out.
Frost probability
LANDSBURG · 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 Maple Valley’s own odds, recorded at LANDSBURG.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 7 | May 10 | Apr 23 | Sep 19 | Oct 6 | Oct 26 |
| 32°F | May 10 | Apr 20 | Mar 31 | Oct 5 | Oct 25 | Nov 12 |
| 28°F | Apr 16 | Mar 24 | Feb 28 | Oct 24 | Nov 12 | Dec 8 |
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 Maple Valley, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 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.
Maple Valley planting FAQ
When is the last spring frost in Maple Valley, WA?
Plan for the last spring frost in Maple Valley around April 20 (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 Maple Valley, WA?
The first fall frost in Maple Valley typically arrives around October 25 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Maple Valley in?
Maple Valley is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Maple Valley?
There are roughly 188 frost-free days in Maple Valley (a moderate growing season), running from the average last frost around April 20 to the first fall frost near October 25.
When should I plant tomatoes in Maple Valley?
In Maple Valley, start tomato seeds indoors around February 23–March 9, then transplant seedlings outdoors around April 27 once the danger of frost has passed.
Never miss a window in Maple Valley
An email when it’s time to start seeds, transplant, and sow — timed to Maple Valley’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Covington · 5 km
- Lake Morton-Berrydale · 6 km
- Fairwood · 12 km
- East Renton Highlands · 13 km
- Kent · 14 km
- Auburn · 15 km
- Renton · 17 km
- Lake Tapps · 18 km
Frost dates recorded at LANDSBURG, 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 Maple Valley, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00454486. Retrieved from https://blissgarden.com/washington/maple-valley.