Cedar vs Pressure Treated Fence: Which Lasts Longer? (Cost, Pros & Cons)

Cedar and pressure treated pine both make good fences, but they are good at different jobs: pressure treated wood rated for ground contact (UC4A or higher) belongs in the soil, while cedar earns its higher price above ground as pickets and rails. Which wood you pick matters less than putting each wood in the right place. This guide covers which part of the fence should be which wood, how to read the end tag, which fasteners each wood needs, and how the two compare on cost and upkeep.

Cedar vs Pressure Treated Fence: Which Wood Goes Where

Most cedar-or-treated arguments skip the real question, which is which part of the fence you are buying for. A fence is posts in the ground, rails and pickets in the air, and often a gate and cap. Each part faces a different kind of moisture, so the same wood does not win everywhere.

Fence part	Best choice	What to look for	Why
Posts (in the ground)	Pressure treated	End tag reading UC4A or higher (UC4B for heavy-duty or hard-to-replace posts)	Soil contact is the hardest exposure and cedar has no ground-contact rating
Rails	Treated or cedar	Treated: UC3B or higher. Cedar: heartwood grade	Above ground, but rails hold water where they meet posts and pickets
Pickets	Cedar or treated	Treated: UC3B or higher. Cedar: mostly heartwood, few sapwood streaks	Above ground and fully visible, so appearance and stability matter
Gate frame and hardware posts	Treated posts, cedar or treated frame	Heavy-duty posts, stainless or heavy-coated hardware	Gates flex and swing, which opens joints to water
Top cap and trim	Cedar	Cap sloped to shed water	End grain faces up and soaks up water faster than any other face

Rot concentrates where wood meets soil and where it cannot dry between rains, which is why the post at ground level is the usual first failure point on a wood fence. Put your money into the post rating first, then into the picket you actually want to look at.

How Long Does Each Fence Last?

Published lifespan figures for both woods are all over the map. Contractor and supplier sites commonly quote roughly 10 to 15 years for treated pine and roughly 15 to 30 for cedar, and the ranges overlap heavily. That spread is the honest answer: climate, drainage, grade, sun exposure and whether you finish the wood move the number more than the species does. Treat any single lifespan figure as a rough planning range, not a guarantee.

Why Cedar Resists Rot Above Ground

The USDA Forest Products Laboratory’s Wood Handbook describes western redcedar heartwood as very resistant to decay, thanks to natural extractives in the wood. The catch is that this protection lives in the heartwood only. Untreated sapwood of essentially every species has low decay resistance, and western redcedar sapwood is the pale outer strip, often an inch wide or less. A budget cedar picket with a wide pale edge has less built-in protection than a clear heartwood one, which is one reason two cedar fences of the same age can age so differently.

Why Treated Pine Lasts Where Cedar Struggles

Pressure treated lumber gets its protection from preservative forced deep into the wood, so even pine sapwood, which would rot quickly untreated, resists decay. How much preservative the wood holds is what the use category on the tag tells you. For the full breakdown, see our guide to ground contact pressure treated lumber.

Why the End Tag Matters More Than the Species

The most common and most expensive mistake with a treated-wood fence is buying above-ground lumber and burying it. Both boards look identical on the rack. The difference is on the end tag or stamp.

• UC3B: rated for exterior above-ground use, such as pickets, rails and deck boards. Not for soil contact.
• UC4A: rated for general ground contact, which covers ordinary fence posts.
• UC4B: a higher preservative level for heavy-duty ground contact, such as posts that are hard to replace or sit in wet, severe conditions.

Check the tag on each post at the yard, not just the label on the bin. If a post has no use-category tag, do not assume it is a ground-contact post. Cedar has no such tag at all, which is the practical reason treated posts win below grade.

Which Is Better for Fence Posts: Cedar or Pressure Treated?

Pressure treated, rated UC4A or higher. Cedar heartwood is a good above-ground wood, but burying it asks natural extractives to hold off soil moisture, fungi and insects for years, and any sapwood on the post fails first. Set treated posts in compacted gravel or concrete with the top of the footing sloped to shed water, keep the bottoms of the pickets off the soil, and you have put the strongest material where the fence is weakest.

If you want a fully cedar look, you can still use treated posts and cover or trim them to match. Many builders simply let the treated posts show and run cedar pickets between them.

Can You Mix Cedar and Pressure Treated Wood in the Same Fence?

Yes, and it is the combination many fence builders end up recommending: treated posts, then cedar or treated rails, then cedar pickets. The one real compatibility issue is hardware, covered next. The two woods also move differently as they weather, so leave the normal small gap between pickets rather than butting them tight.

Fasteners: The Part Both Camps Get Wrong

Modern copper-based preservatives (ACQ and copper azole) corrode plain steel faster than untreated wood does, and cedar’s natural acids can stain and corrode cheap fasteners as well. Simpson Strong-Tie recommends hot-dip galvanized or stainless steel hardware for treated wood, with the heavier G185 galvanized coating giving more protection than standard G90, and stainless steel (Types 304 or 316) for the harshest exposure, including higher-retention ground-contact lumber (Simpson Strong-Tie treated wood FAQ).

Wood	Minimum hardware	Better choice	Avoid
Treated pine	Hot-dip galvanized (rated for treated wood)	Stainless steel, or G185 coated connectors	Bright, electroplated or thin-coated steel
Cedar	Hot-dip galvanized or stainless	Stainless steel, which avoids dark streaking around fasteners	Plain or electroplated steel
Mixed (treated posts, cedar pickets)	Hot-dip galvanized or stainless	Stainless throughout, so one wood never drives your hardware choice	Mixing stainless fasteners with galvanized connectors in the same joint

For sizes, drive types and brand picks, see our guides to screws for a wood fence and screws for pressure treated wood. We do not repeat those here.

Appearance, Movement and Finishing

Left unfinished, both woods turn silver-gray outdoors. Cedar starts with a warm red-brown that many people want to keep. New treated pine often has a greenish or brownish tint from the preservative and, because it is commonly sold wet, tends to shrink and sometimes cup or twist as it dries, opening gaps between pickets. Cedar that has been dried before sale usually moves less, which is a quiet advantage on a privacy fence.

Finishing is where the two woods differ most in timing. Cedar can usually be finished soon after it is built, while treated lumber needs to dry out first. Our guide to staining treated lumber explains how to tell when it is ready, and our fence stain comparison covers clear versus semi-transparent finishes. Either wood needs re-finishing every few years to hold its color; a finish slows weathering but does not stop it.

Cost: What Actually Drives the Price Gap

Cedar pickets generally cost more per board than treated pine pickets, and the gap varies by region and grade, so we are not quoting a per-foot number here. Price the same picket size at your local yard before you decide. For current numbers on cedar itself, see our cedar wood cost guide.

Three things change the real cost more than the sticker price:

• Posts are the same either way. Treated posts go in under both designs, so the price difference comes only from rails and pickets.
• Grade. A premium clear cedar picket and a budget cedar picket with wide sapwood edges are different products. Pay for heartwood if appearance and longevity matter.
• Finish and maintenance. Both woods need re-finishing on a schedule. Add stain and labor to either column before comparing.

If you are weighing wood against other fence types entirely, see chain link vs wood fence. For other outdoor builds, our outdoor furniture wood rot ratings show how cedar compares with other species.

Safety and Disposal

• Wear a dust mask, eye protection and gloves when cutting or sanding either wood. Treated sawdust carries preservative, and western red cedar dust is a known respiratory irritant for some people.
• Never burn treated lumber scraps. Dispose of offcuts through your local waste rules.
• Wash your hands before eating after handling treated wood, and keep treated offcuts away from vegetable beds and compost.

Modern ACQ and copper azole treatments replaced CCA (chromated copper arsenate) in most residential lumber starting in 2004, so new treated fence lumber does not carry the arsenic of older fences. Old CCA lumber from a previous fence is still around and should be handled and disposed of with the same care.

Frequently Asked Questions About Cedar vs Pressure Treated Fences

What are the benefits of a cedar fence over a pressure-treated fence?

Cedar heartwood resists decay on its own, tends to stay more stable as it dries, and looks better under a clear or lightly tinted finish. Treated pine costs less at most yards and is the safer choice anywhere wood touches soil. Cedar wins on looks above ground; treated wood wins on in-ground durability.

Which fence type is more eco-friendly, cedar or pressure-treated?

Cedar is untreated wood, so there are no preservatives to leach and offcuts can be disposed of like ordinary wood. Modern copper-based treated lumber is far safer than the old arsenic-based CCA, but its scraps should never be burned and may need special handling in your area. Check your local disposal rules.

Are there cost differences between cedar and pressure-treated fences?

Yes. Cedar pickets generally cost more per board than treated pine pickets, and the gap depends on grade and region. Price the same picket size at your local yard, and see our cedar cost guide for current numbers. Posts are the one place where paying for cedar buys nothing.

Should I use cedar or pressure treated wood for fence posts?

Use pressure treated posts rated for ground contact (UC4A or higher, shown on the end tag). Cedar heartwood is durable above ground, but it is not sold with a ground-contact rating, and any sapwood in a cedar post decays quickly in soil. Treated posts with cedar pickets is the standard combination.

Can you mix cedar and pressure treated wood in the same fence?

Yes. Treated posts and rails with cedar pickets is a common build. Use stainless steel or hot-dip galvanized fasteners rated for treated wood, because copper-based preservatives corrode plain or thinly coated steel faster, and cedar can streak around cheap fasteners.

Are fence pickets pressure treated?

Some are and some are not. Pickets are sold in treated pine, cedar and other species. Treated pickets are usually rated for above-ground use (UC3B), which is fine for pickets but not for posts. Read the end tag to see the rating before you buy.

Conclusion

Put pressure treated posts rated UC4A or higher in the ground, then choose cedar or treated pine for the rails and pickets based on how you want the fence to look and what you want to spend. Match your hardware to the wood, check the end tag at the yard, and plan to re-finish either wood every few years. That gives you durability where the fence is weakest and good looks where it shows.