Knowing how to winterize an outdoor sauna starts with one decision: will you keep using it through the cold months, or shut it down until spring? Either way, the core jobs are the same. Keep snow and ice off the roof, make sure water drains away from the base, protect the exterior wood before the weather turns, and keep the heater and wiring dry. A sauna in use needs attention after every storm; a closed sauna needs one careful shutdown.
This guide covers both paths, with checklists at the end. Your own sauna and heater manuals have the final word.
Two ways to winterize: keep using it or shut it down
Regular use helps the sauna itself. Almost Heaven Saunas notes in its winterizing guide that the best way to maintain a sauna is to use it regularly. The Dundalk manual says minor seepage on a barrel’s top and sides is normal and evaporates once the heater runs.
If you will not use it for months, focus on keeping water out. Leisurecraft’s sauna maintenance sheet suggests a weatherproof cover if the sauna will sit unused for long periods.
| Task | Using it all winter | Shutting it down |
|---|---|---|
| Snow on the roof | Clear after each storm | Check and clear after heavy snow |
| Heater | Run, then let the room dry | Power off at the disconnect or breaker |
| Water | Empty the bucket after every session | Remove buckets, ladles and bottles |
| Wood stove | Empty cold ash regularly | Clean out ash, cap or close as the manual allows |
How to winterize an outdoor sauna roof: sauna snow load and clearing
Snow is the biggest winter stress on an outdoor sauna. Leisurecraft’s maintenance sheet tells owners to remove snow and ice from the sauna roof. Wet snow and ice add weight and hold water against the wood, so clear it early.
Barrel saunas: bands and staves
On a bare barrel, pull snow down the curve with a soft roof rake or plastic broom. Avoid metal shovels and ice picks, which can gouge staves or catch the bands. Barrels such as the Dundalk CT Harmony 4 Person Barrel Sauna (from $5,555.16) and the Dundalk CT Serenity Barrel Sauna CTC2245W (from $6,158) list optional black asphalt shingle or black metal roofs on our product pages. Almost Heaven also suggests a rain jacket style cover for barrels, but notes it does not pair with wood burning saunas that have chimneys.
Shingle and cabin roofs
Brush snow off shingles gently and do not chip at ice. The Dundalk manual warns not to hit the aluminum bands with roofing nails, so keep any repair fasteners clear of them. Cabin models like the Canadian Timber Granby Cabin Sauna CTC66W ($6,137) have a peaked roof that our listing describes as weather proof, but deep drifts still need clearing. We also list a Dundalk Add Roof accessory ($268); its page does not say which models it fits, so call us to confirm before ordering.
Check barrel band tension before the cold sets in
Cedar staves swell and shrink with moisture. The Dundalk manual says the goal is for the cedar to expand into the bands, making the staves tighter, and that staves and bands are always better being as tight as possible. The SaunaFin barrel assembly instructions add that bands may need tightening after a period of time, usually within the first few months. Almost Heaven also says to check that staves are snug. A fall check is a sensible habit: snug the band bolts and look for gaps at the top staves before snow arrives.
Exterior wood finish before winter
The Dundalk manual says untreated cedar will weather to grey without harming the wood or the sauna’s performance, and offers exterior stains if you want to keep the color. Leisurecraft’s maintenance sheet recommends an exterior stain to protect the wood from weathering. Apply stain on a dry day before freezing weather, within the stain maker’s temperature limits, and never treat the interior.
Ice and drainage under the sauna
Pooled water under a sauna freezes and thaws against the cradles or floor. The Dundalk manual asks for a level base with a slight slope to the back for drainage. Clear leaves from under the base, keep roof runoff off the pad, and do not pile shoveled snow against the walls. Our outdoor sauna foundation guide covers base options if yours is not draining well.
Door, vents and cold weather sauna airflow
Check that the door closes fully, since cold drafts slow warm up. Leisurecraft’s maintenance sheet says to keep vents, especially near the heater, clear and unobstructed. If your sauna is missing adjustable vents, the Dundalk Complete Sauna Vent Kit ($24) includes intake and exhaust covers with rotating wooden panels. Slow heating in the cold? Our sauna not getting hot enough guide explains why.
Electrical safety and keeping the heater dry
Have a licensed electrician check the outdoor wiring and disconnect before winter; local code has the final word. Do not assume a GFCI breaker is required or allowed: the Dundalk barrel manual says not to use a G.F.I breaker, and the Harvia KIP manual says not to connect the heater through an RCD.
Harvia notes heater elements can absorb moisture from the air, which clears after the heater runs a few times. After each session, its manual says to switch the heater off, check that the stones are dry, and sometimes leave it on a while so the wood dries. Harvia also says to rearrange the stones at least once a year. If you are adding or replacing a heater, the Harvia KIP Electric Heater is listed from $1,214 in 4.5, 6 and 8 kW sizes.
Wood stove chimney and ash safety
Wood burning barrels like the Dundalk CT Elation 4 Person Barrel Sauna ($6,976, heater sold separately) are popular for winter use. The U.S. Fire Administration advises an annual professional chimney inspection and cleaning, keeping anything that can burn at least 3 feet from the stove, and putting ashes in a metal container with a lid placed outside at least 10 feet from your home. Leisurecraft also says to remove ashes regularly and check the chimney for soot.
Pre winter checklist
- Snug barrel bands and look for gaps between staves.
- Stain or oil the exterior on a dry day, if you finish it.
- Clear leaves and debris from under the sauna and confirm drainage.
- Check the door seal, hinges and both vents.
- Have an electrician inspect wiring and the disconnect.
- Rearrange or replace heater stones; book a chimney inspection.
Shutdown checklist
- Run the heater one last time so the wood dries, then turn off power at the disconnect or breaker.
- Empty and bring in buckets, ladles and water bottles so nothing freezes and cracks.
- Clean out the wood stove ash once it is fully cold.
- Add a weatherproof cover if your model allows one, and check the roof after big storms.
Frequently asked questions
Can you use an outdoor sauna in winter?
Yes. Dundalk’s Elation listing says it is designed for outdoor use in all climates, and regular use helps dry the wood. Expect longer warm up times in the cold.
How much sauna snow load is too much?
None of our sauna listings publish a snow load rating, so clear snow and ice after each storm, as Leisurecraft recommends.
Should I leave water in the sauna bucket over winter?
No. Empty the bucket after each session and bring it inside if the sauna is shut down, since water left to freeze can crack buckets and ladles, and spills soak into the floor.
Is going from a cold weather sauna into the snow safe?
Moving between heat and cold puts extra strain on the heart and blood pressure. Start gently, stay hydrated, avoid alcohol, and talk to your doctor first if you are pregnant or have a heart condition or other health concern.
Questions about getting your sauna ready for winter? Call us at 866-777-2590, Monday to Friday, 9AM to 6PM PST, and we will help you pick a roof option, heater or accessory for your model. Browse every Dundalk Leisurecraft model, compare shapes in barrel sauna vs cabin sauna, or start with our home sauna buying guide. Orders of $999 or more ship free by freight; smaller orders ship for a flat $200.
