Written by Tim Gaughan, Urban Edge. Published October 25, 2026.
A well-built cedar fence in the Portland area usually lasts about 15 to 20 years, and the posts are what give out first, not the boards. A fence with posts set right, boards kept off the soil and a little upkeep lasts toward the top of that range; one built fast can lean or rot within ten.
Why posts fail first
The fence boards dry out between storms. The posts don't: they sit in soil that stays wet from October to May. Rot starts right at ground level, where air, water and wood meet. When enough posts go soft, the fence leans in the first big wind.
What makes a fence last
- Posts sized and set for the height and wind. Taller fences and gates need bigger, deeper posts.
- Drainage at the post base, so water does not pool against the wood.
- Boards kept off the ground, an inch or two above the soil, so they do not wick water.
- A cap or top rail that sheds rain off the end grain.
- Hardware that won't rust out, especially on gates.
- Upkeep: clear dirt and plants off the bottom, and refinish if you want to keep the color.
We set fence posts 2 feet deep in concrete, with the top sloped so water runs away from the wood.
Signs your fence is near the end
- Posts that wobble or are soft at the ground when you push a screwdriver in.
- A lean along a section.
- Boards splitting, cupping or rotting at the bottom.
- Gates that sag and drag. Often the gate post, not the gate, is the problem.
Repair or replace
If one or two posts have failed and the boards are sound, replacing those posts is a fair repair. If most posts are soft, replacing the fence costs little more than chasing post after post.
Should I stain it?
Stain does not make cedar last much longer structurally, but it slows graying and keeps the boards from drying and cracking in summer. Our Painting site covers fence staining.
Our work is covered by a 2-year workmanship warranty, in writing.
Get a free estimate or call Tim, (503) 597-8520.