It depends: on the wood species and grade, how the posts were set, ground contact, sun, wind and upkeep. We'd rather explain those factors than print a number we can't source.
What shortens a wood fence's life
- Posts. Posts are usually the weak point. Wood in contact with soil and moisture breaks down faster, and some fences use steel posts with wood pickets for that reason.
- Sun (UV) and drying. Unprotected wood weathers gray, checks and can warp.
- Wind. Wind loads stress posts and rails, especially on tall privacy fences.
- Sprinklers and soil contact. Wood that stays wet at the bottom deteriorates sooner.
Staining and sealing
A penetrating stain or sealer slows weathering. Follow the product label for how long new wood should dry before the first coat and how often to recoat. Coverage and timing vary by product.
Repair or replace?
- Repair makes sense when a few posts, rails or pickets are damaged and the rest is sound, for example after a storm.
- Replace when many posts are loose or rotted, or the fence leans along long runs.
Re-setting posts involves digging, so call 811 first. See fence repair.
General information only, not legal or engineering advice. Rules change, so confirm with the agency linked below or a licensed professional before you start work.
Sources
Last reviewed: October 2026.
Related: Wood fences · Fence repair · All guides