Is Cedar Good for Outdoor Use? Cost, Lifespan & Downsides

Cedar is good for outdoor use because its natural oils resist rot, decay, and insects for 15 to 20+ years outdoors – but it costs 30 to 50% more than pressure-treated lumber and grays without regular sealing. Skipping maintenance won’t rot cedar, but it will fade a $40 gallon of sealer’s work within two summers. This guide covers cedar’s real cost versus pressure-treated wood and redwood, where it performs best outdoors, and how to protect it.

What Makes Cedar Good for Outdoor Use

Cedar is a softwood that contains natural oils and tannins, called thujaplicins, that repel rot fungi and wood-boring insects without any chemical treatment. That’s why cedar shows up untreated on fences, shakes, and siding that have held up for decades in wet climates. It also has a low shrinkage factor, so boards stay dimensionally stable instead of cupping or splitting as humidity swings between seasons.

Its natural resistance doesn’t mean cedar is indestructible. The oils that fight decay sit mostly in the reddish heartwood; the pale sapwood around the outer edge of a board has little of that protection and can rot like any other softwood if it stays wet. When you’re buying cedar for ground-contact use, ask for all-heartwood boards, or you’re paying a cedar price for sapwood performance. For furniture builds specifically, our guide to the best cedar for outdoor furniture breaks down which grade and species combination holds up longest.

“Cedar” at the lumber yard almost always means western red cedar, the species behind most decking, fencing, and siding boards in North America. Eastern white cedar is a lighter-weight, slightly less durable alternative common in the Northeast and Canada. Aromatic (Spanish) cedar – the reddish, fragrant wood used in closets and cigar boxes – is a different species entirely and isn’t graded or sold for structural outdoor use, so don’t substitute it if a project calls for western red or eastern white cedar.

Cedar Cost vs. Pressure-Treated Wood and Redwood

Cedar’s biggest downside isn’t durability – it’s price. Material alone runs $6 to $12 per square foot for western red cedar boards, versus $3 to $6 per square foot for pressure-treated pine, and installed deck costs follow the same gap: roughly $20 to $40 per square foot for cedar versus $15 to $25 for pressure-treated. Both materials last about the same in practice – 15 to 25+ years with regular care – so the extra cost buys appearance and a chemical-free surface, not a longer lifespan.

Material	Material Cost/sq ft	Installed Cost/sq ft	Typical Lifespan
Western Red Cedar	$6 – $12	$20 – $40	15 – 20+ years
Pressure-Treated Pine	$3 – $6	$15 – $25	15 – 25+ years
Redwood	$7 – $13	$22 – $42	15 – 25+ years

📊 Pressure-treated lumber typically costs 30-50% less upfront than cedar, though cedar needs less chemical maintenance over its life. – Source: DeckMath, 2026

That price gap comes down to more than just “cedar is fancy wood” – species, grade, and drying method each move the number independently. See our full breakdown of why cedar costs what it does for a species-by-species price comparison.

Where Cedar Works Best Outdoors

Cedar earns its keep on projects where its natural resistance and light weight matter more than raw strength: fencing, exterior siding and shakes, pergolas, planters, and outdoor furniture. On ground-contact posts or structural framing, most codes still require pressure-treated lumber regardless of species, so cedar is better reserved for the visible, above-grade parts of a build. Our guide to cedar’s natural properties covers which cuts and grades hold up best in each of these uses.

• Fencing and gates – naturally resists ground-level moisture better than pine without chemical treatment
• Siding and shakes – lightweight and stable, so it won’t warp or split under normal temperature swings
• Furniture and planters – safe to leave untreated near plants and food-growing beds, unlike some treated lumber
• Pergolas and trellises – resists rot in the joints where water tends to collect

Cedar’s Downsides You Should Know

Cedar is a softwood, so it dents and scratches more easily than hardwoods like teak or even pressure-treated southern yellow pine, which matters on high-traffic decking or furniture that gets moved around. Left unfinished, it weathers to a flat silver-gray within one to two years – some homeowners like that look, but it isn’t reversible without sanding back to bare wood. And because cedar costs more per board foot than pine or PT lumber, a full deck or fence rebuild in cedar can run well past a comparable pressure-treated project, even though the two won’t last meaningfully different lengths of time.

Is Cedar or Pressure-Treated Better for a Deck?

Pressure-treated wood is the better choice for structural framing and ground-contact posts on any deck, cedar or not, because most codes require treated lumber there regardless of species. For the visible decking boards and railings, cedar wins on looks and chemical-free contact but costs 30-50% more; pressure-treated wins on upfront price and slightly better ground-contact rot resistance from its chemical preservatives.

How to Protect Cedar Outdoors

Cedar doesn’t need sealing to survive outdoors, but it needs sealing to keep its color and resist surface checking. Follow these steps for new or existing cedar:

1. Let new wood dry first: wait 4-6 weeks after installation so surface moisture from milling can escape before you seal it.
2. Clean the surface: scrub with a mild soap solution and a soft brush to remove dirt, mildew, and mill glaze; avoid pressure washing above 1,200 PSI, which can fuzz the grain.
3. Apply a UV-blocking sealant or oil finish: use a product made for exterior wood, applied with a brush, roller, or sprayer in two light coats.
4. Keep wood off the ground: use a plastic or metal barrier between cedar posts or furniture legs and soil to cut off moisture wicking.
5. Reapply every 1-3 years: south-facing and high-sun surfaces need resealing closer to yearly; shaded, covered areas can stretch to three years.

For a deeper breakdown of stain versus clear sealer options, see our guide on wood deck stain and sealer. For general upkeep across species, our wood care and protection guide covers cleaning schedules and pest defense that apply to cedar too.

Cedar vs. Other Outdoor Woods

Cedar, redwood, and pressure-treated pine dominate outdoor lumber choices in the U.S., and each trades off cost, color, and chemical exposure differently. Redwood is cedar’s closest competitor – similarly rot-resistant, similarly priced, and increasingly limited by regional availability since most of it now comes from a smaller supply base in California. If you’re building somewhere hot and humid rather than dry, our comparison of cedar vs. cypress wood covers a third rot-resistant option that’s more common in the Gulf Coast and Southeast. For framing-grade alternatives, see whether Douglas fir holds up outdoors the way cedar does.

Frequently Asked Questions

How Long Does Cedar Wood Last Outside?

Cedar typically lasts 15 to 20+ years outdoors when it’s all-heartwood and gets occasional cleaning. Left completely untreated in a wet climate, expect the lower end of that range; sealed and reapplied every 1-3 years, cedar fences and siding regularly reach 20-25 years.

Does Cedar Need to Be Sealed for Outdoor Use?

No, cedar does not need to be sealed to survive outdoors – its natural oils already resist rot and insects. Sealing is about appearance, not survival: unsealed cedar will still hold up structurally, but it will weather to a gray color within one to two years instead of keeping its reddish-brown tone.

How Do You Protect Cedar Wood Outside?

Protect cedar outside by cleaning it with mild soap and a soft brush, then applying a UV-blocking exterior sealant or oil-based stain in two light coats. Keep the wood off direct ground contact with a plastic or metal barrier, and reapply the sealant every 1 to 3 years depending on sun exposure.

Is Cedar Wood Cheaper Than Pressure-Treated Wood?

No, cedar is more expensive than pressure-treated wood – typically 30 to 50% more per square foot, both for materials and installed cost. Pressure-treated pine runs about $3 to $6 per square foot in material cost versus $6 to $12 for western red cedar.

What Is the Best Wood for Outdoor Use?

The best wood for outdoor use depends on the project: cedar and redwood are the top softwood choices for their natural rot resistance and appearance, while pressure-treated pine is the most budget-friendly option for structural or ground-contact framing. Teak is the strongest choice among hardwoods but costs significantly more than any of the softwood options.

Conclusion

Cedar is a solid choice for outdoor use wherever its natural rot and insect resistance, light weight, and appearance matter more than raw strength or upfront cost – fencing, siding, furniture, and pergolas are its strongest fits. For structural framing or ground-contact posts, pressure-treated lumber remains the more code-compliant and budget-friendly pick. Whichever you choose, a UV-blocking sealant reapplied every 1 to 3 years is what actually keeps either wood looking new.