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How Long Does a Cedar Fence Last? 15 to 30 Years

Cedar boards outlive cedar posts by a wide margin, and the posts are what fail. Realistic lifespans, what shortens them, and the one build detail that matters.

By Zakaria 3 min read Save to Pinterest — opens Pinterest in a new tab
Closely spaced vertical timber fence boards weathered to an even silver-grey
Photo: Magda Ehlers, Pexels License, via Pexels
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Fifteen to thirty years — but that number hides the useful fact. The boards usually have decades left when the fence comes down. What fails is the posts, at ground level, and that is a build decision rather than a property of cedar.

Where the fence actually dies

Lifespan by component
ComponentTypical lifeWhy
Posts, cedar, in ground10–15 yearsPermanently damp, oxygen-poor soil
Posts, pressure-treated, ground-contact rated20–30+ yearsDesigned for exactly this
Rails20–30 yearsAbove ground, drains, dries
Boards / pickets20–30+ yearsOften barely weathered at scrapping

Cedar’s decay resistance is real — it comes from extractives in the heartwood — but it is not equal to being buried in wet soil where decay fungi work all year.

The decision that changes the answer

Pressure-treated posts rated for ground contact, or steel post inserts. Cedar for everything above.

That is a longer-lived fence than all-cedar, and it costs less. Cedar’s appearance and rot resistance do their work in the air, where you can see them; in the ground they are simply outmatched.

Staining: less than you think

Worth being straight about, because it is sold as life extension.

A finish slows UV greying and surface checking. It does not meaningfully protect the buried portion of a post, which is the thing that ends the fence.

Left bare, cedar weathers to silver-grey and keeps performing. If you stain, do it because you want the colour, not because you believe it adds a decade.

Cedar against pressure-treated, honestly

CedarPressure-treated
AppearanceBetter, and ages wellUtilitarian
StabilityStays straighterWarps, twists, checks as it dries
Ground contactModerateDesigned for it
CostHigherLower

The sensible answer is usually both, each where it is strongest — rather than picking one material for the entire structure.

What shortens it

Unplanned ground contact is the commonest killer

  • Boards or rails touching soil, often because a flower bed has risen against the fence over the years
  • Sprinklers hitting it daily
  • Vegetation growing against it, holding moisture on the wood
  • Concrete collars that trap water around the post instead of draining away from it

Every one of those is a maintenance problem rather than a material problem — which is why two identical fences can be ten years apart in how long they last.

Common questions

How long does a cedar fence last?

Fifteen to thirty years for the fence as a whole, with well-maintained western red cedar at the upper end and neglected fences in wet climates at the lower. The number is less useful than the distribution, though: the boards and rails usually have decades left when the fence comes down, because what actually fails is the posts at ground level.

Why do cedar fence posts fail first?

Because the part in the ground sits in permanently damp, oxygen-poor soil where decay fungi work year-round, and because the heartwood's natural resistance is good but not equal to that. Cedar posts in direct ground contact commonly last ten to fifteen years, while the boards above them are barely weathered. The fence is then scrapped for a failure affecting a fraction of its material.

Should I use cedar posts at all?

Generally no, and this is the single decision that most changes how long a fence lasts. Use pressure-treated posts rated for ground contact, or steel post inserts, and keep cedar for everything above ground where its rot resistance and appearance are actually doing work. A cedar fence on treated posts is a longer-lived fence than a cedar fence on cedar posts, for less money.

Does staining a cedar fence make it last longer?

It helps, but less than people assume, and mainly cosmetically. Cedar's decay resistance comes from extractives in the heartwood rather than from any surface coating, so a finish mostly slows UV greying and surface checking. It does not meaningfully protect the part that fails. Left bare, cedar weathers to silver-grey and keeps performing.

How does cedar compare to pressure-treated for a fence?

Cedar looks better, stays straighter, weathers to grey gracefully and costs more. Pressure-treated lasts well in ground contact and is cheaper, but is more prone to warping, twisting and checking as it dries. The common answer is to use both where each is strongest — treated in the ground, cedar in the air — rather than choosing one for the whole fence.

What shortens a cedar fence's life most?

Ground contact anywhere it was not designed, which usually means boards or rails touching soil or buried under a rising flower bed. After that: sprinklers hitting it daily, vegetation growing against it and holding moisture, and concrete post collars that trap water around the post rather than draining it. Most of those are maintenance problems rather than material problems.

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