Fencing · Cool & damp
How long does a vinyl fence last in Seattle, WA?
In Seattle, a vinyl fence won’t rot, but the damp still shows: about 154 rainy days and 83% average humidity let green algae and mildew grow on the shady side of white panels unless they are washed once or twice a year. Model estimate: 25–32 years of service.
Storyboard
20 years in Seattle, washed yearly
Seattle’s wear fingerprint
Each bar is scaled to the highest of the 25 cities we cover; the black line marks the median.
NOAA station SEATTLE BOEING FLD (USW00024234, 7.3 km away), 1991–2020 normals · humidity & UV: NASA POWER.
What fails first here
- 1Green algae & mildewThe most common complaint about white vinyl. Moderate here: 154 rainy days a year, so mostly on north-facing panels. A garden-hose wash with mild soap removes it.
- 2Cracks from cold impactsRare here: only about 29 freeze–thaw days a year.
- 3Chalking & slight yellowingUV slowly breaks down the surface of PVC, leaving a dull, chalky film. UV here ranks #25 of 25.
- 4Sagging in heatOnly about 3 days a year top 90 °F, so heat sag is unlikely.
Upkeep
Seattle maintenance calendar
Built from local normals: bar width is the share of days with rain; composite mainly needs washing.
Same city, other materials
How the alternatives age in Seattle
Pin-ready
Save it for when you build.
The 20-year storyboard as a tall pin, linking back to this page.
Vinyl fences in similar climates
Portland, OR
New York, NY
Boston, MA
Chicago, IL
Buffalo, NY…and in very different ones
Phoenix, AZ
Las Vegas, NV
Albuquerque, NMQuestions Seattle owners ask
How long does a vinyl fence last in Seattle?
Our model puts a vinyl fence at 25–32 years in Seattle (national typical range 20–30 yrs). It never rots; what ends its life is UV chalking, brittleness in cold and impact damage.
How often should you clean a vinyl fence in Seattle?
Twice a year — in spring and fall. Dirt and pollen are the main thing to wash off.
Vinyl or wood fence: which lasts longer in Seattle?
Our model gives a vinyl fence 25–32 years here and an untreated cedar fence 14–18 years. Vinyl needs washing instead of staining, and it does not rot at the posts.
Why does a white vinyl fence turn green in Seattle?
The green film is algae and mildew growing on dirt and pollen that sit on the surface, mostly on the shady side and near the ground. It does not damage PVC; a wash with water and mild soap (or a vinyl cleaner) removes it.
Model simulation, not a guarantee: south-facing, full sun, no shade or ground-contact surprises. How it works.