What Is the Best Wood for a Sauna?

The best wood for a sauna is a low-density, low-resin softwood that stays cool to the touch and resists moisture. Western red cedar leads for aroma and rot resistance, hemlock is the value pick for indoor cabins, and basswood or aspen win for anyone sensitive to scent. For outdoor builds, thermally modified aspen is the durability upgrade.

The short answer

The best wood for a sauna balances three things: how cool it stays under your skin, how well it handles repeated heat and humidity, and how much scent or resin it releases. Western red cedar is the premium standard because natural oils resist rot, insects, and mildew while giving off a soft aroma. Hemlock is the most common wood in infrared cabins because it is stable, low in resin, and priced below cedar. Basswood and aspen have almost no odor or tannins, which makes them the safest choice for allergies, asthma, or a child using the room. For an outdoor sauna exposed to weather, thermally modified aspen (often sold as thermo-aspen) resists warping and decay far better than untreated wood. Match the wood to your sauna type, your budget, and your sensitivity to scent, and any of these will serve you well.

Cedar vs hemlock: which sauna wood is better?

This is the comparison most home buyers land on, and the honest answer is that it depends on your priorities.

Cedar is the traditional favorite. Its natural oils repel water and resist rot, insects, and mildew, so it needs the least upkeep of any common sauna wood. Low density means it stays relatively cool against bare skin, and the aroma is part of the classic sauna experience. The tradeoffs are price and scent: cedar runs higher per square foot, and its smell can feel strong to anyone sensitive to it. According to the USDA Forest Products Laboratory, western red cedar heartwood is rated resistant to very resistant to decay, which is why it holds up so well in a humid room.

Hemlock is the practical alternative. It is stable, low in resin, and performs well at the lower temperatures infrared saunas run, which is why so many infrared cabins are built from it. It costs less than cedar and delivers similar structural performance. The catch is moisture: hemlock lacks cedar's natural oils, so it benefits from good ventilation and occasional care to prevent drying. If you want the lowest maintenance and the aroma, choose cedar. If you want strong value in an indoor room, hemlock is hard to beat.

What about basswood and aspen?

Basswood and aspen are the quiet overachievers, especially for comfort and sensitivity.

Basswood has very low heat transfer, so benches stay comfortable during long sessions, and it carries almost no tannins or resins. That makes it a top pick for people with allergies or chemical sensitivities. It has one of the better heat-to-strength ratios of any sauna wood, though it is not as naturally rot-resistant as cedar and rewards good ventilation and drying between uses.

Aspen is lighter, softer, and more affordable. It contains virtually no resin, tannin, or aroma, which makes it the clear choice for anyone with asthma, chemical sensitivity, or a child using the sauna. Its low cost makes it practical for wall paneling in larger builds where you need to cover a lot of square footage. The tradeoff is durability: plain aspen is softer than cedar or hemlock and needs more regular upkeep. That weakness is exactly what thermal modification solves.

Is thermally modified (thermowood) aspen worth it for an outdoor sauna?

For an outdoor sauna, thermally modified aspen is usually worth the extra cost. Thermowood is any species heated to roughly 356F to 482F in a low-oxygen environment using only steam and heat. The process removes the natural sugars that feed rot and permanently changes the wood's cell structure.

The result is a board that resists rot, mold, and pests far better than untreated aspen, with longevity that approaches cedar. It absorbs little moisture, so it resists warping, cupping, and cracking even through the heat and humidity cycles a sauna puts it through. Low thermal conductivity keeps benches comfortable to the touch even at high air temperatures. For a backyard or outdoor build that faces weather and big swings between hot use and cold rest, that stability is the main reason thermo-aspen has become a go-to bench and interior wood. The USDA's overview of natural decay resistance in wood explains why species and treatment, not just thickness, drive how long wood lasts in wet conditions.

Best wood for an infrared sauna vs a traditional sauna

Your sauna type narrows the field quickly.

Infrared saunas run cooler, usually 120F to 150F, and heat your body more than the air. Hemlock and basswood dominate here because they are stable at those temperatures and low in resin, which matters in a smaller, enclosed cabin. Aspen is common too for its clean, scent-free profile. If you are shopping infrared, our infrared saunas collection lists cabins built from these woods, and our guide on what to look for when buying an infrared sauna covers how wood pairs with heater type.

Traditional and hybrid saunas run hotter, often 150F to 195F, and add humidity from water on the stones. Here, cedar and thermally modified woods shine because they handle heat, steam, and repeated wet-dry cycles without breaking down. If you want that classic hot, aromatic room, browse our traditional saunas for sale, and if you want one cabin that does both infrared and traditional heat, our hybrid saunas pair well with cedar or thermo-aspen interiors. For outdoor placement, cedar and thermo-aspen are the safest bets in our outdoor saunas range.

Which sauna wood is best if you have allergies or sensitivities?

If scent or resin is a concern, choose aspen or basswood. Both are prized for having almost no aroma, tannin, or resin, which is why they are recommended for users with allergies, asthma, or chemical sensitivities, and for pediatric use. Aspen is the most neutral of all, so it is the default when someone in the household reacts to cedar's strong smell. Cedar, by contrast, is the wood most likely to feel overpowering to a sensitive nose, even though its aroma is exactly what many buyers want. If you are unsure how you will react, ask a retailer for a wood sample before you commit, and if you have a respiratory or skin condition, check with your clinician about heat exposure in general.

Sauna wood at a glance

Wood	Feel on skin	Moisture and rot	Scent and resin	Relative cost	Best for
Western red cedar	Stays cool, low density	Excellent, natural oils resist rot	Strong aroma	Highest, about $8 to $15 per square foot	Low maintenance, aroma, indoor or outdoor
Hemlock	Comfortable, stable	Fair, needs ventilation and care	Low resin, faint scent	Budget	Value indoor and infrared cabins
Basswood	Very low heat transfer	Good with care, not rot-proof	Almost none	Mid	Long sessions, sensitivities
Aspen	Cool, soft	Fair, needs upkeep	None	Affordable	Allergies, scent-free rooms, paneling
Thermo-aspen (thermowood)	Cool, very stable	Excellent, resists warp and decay	None to light toasted note	Premium	Outdoor and high-heat builds

Prices are general market estimates and vary by supplier, grade, and region.

How much does sauna wood cost, and does it change what you should buy?

Wood is one of the biggest drivers of a sauna's price and its long-term upkeep. Cedar sits at the top, roughly $8 to $15 per square foot, but its rot resistance and low maintenance often pay back over a 15 to 20 year life. Hemlock and aspen come in lower, which is why so many value-priced cabins use them. Thermally modified aspen carries a premium over plain aspen, but for an outdoor room it can be cheaper than cedar while delivering similar durability.

The practical takeaway: do not buy on price alone. A cheaper wood that needs frequent oiling and careful drying can cost more in effort over time, while a durable wood in the wrong setting is money spent on strength you will not use indoors. For a full walk-through of how wood, heater type, size, and installation add up, see our sauna buying guide, and if you are weighing heater materials alongside wood, our comparison of carbon vs ceramic infrared heaters pairs naturally with this decision.

Frequently asked questions

What is the best all-around wood for a home sauna?

Western red cedar is the best all-around choice for most home saunas because it resists rot and insects, stays cool to the touch, and needs little maintenance. If cedar's aroma or price is a problem, hemlock is the best value for indoor cabins and aspen is the best scent-free option.

What wood should I avoid in a sauna?

Avoid resinous softwoods like pine or spruce for interior benches and anywhere skin touches, because heat can draw out sap and resin that gets sticky and hot. Treated or painted lumber and dense hardwoods that get uncomfortably hot are also poor choices. Stick to sauna-grade cedar, hemlock, basswood, aspen, or thermally modified wood.

Is thermally modified wood better than cedar?

Neither is simply better; they solve different problems. Thermally modified aspen is more dimensionally stable and often more affordable for outdoor use, while cedar offers natural aroma and proven rot resistance without any processing. For a weather-exposed outdoor sauna, thermo-aspen is a strong pick. For a classic aromatic room, cedar still wins.

Ready to choose? Compare cabins by wood and heat type across the sauna collections above, and reach out any time through our support team for help matching wood, size, and budget to your space. As an authorized retailer, we offer free US shipping, financing, and HSA/FSA eligible options on qualifying units.