Off-Season Sauna Care and Storage
If you use a sauna seasonally, a little off-season care keeps it fresh. Here is how to clean, dry and protect a sauna when it will sit unused for a while.
The short answer
Before a sauna sits unused, deep-clean it, refresh the stones and benches, and dry it thoroughly, then keep it ventilated and protected. The goal is to store it clean and bone-dry so no moisture, smell or mould develops while it waits.
If your sauna goes quiet for part of the year — a cottage sauna over winter, or a garden sauna during a busy stretch — a little care before it sits unused keeps it fresh for when you return.
Before it sits idle
- Deep clean. Clean benches, floor, drain and duckboards thoroughly — do not leave sweat and grime to sit.
- Refresh the stones and benches. Restack or replace stones and lightly sand the benches if needed.
- Dry it completely. Run the heater and ventilation to drive out all moisture — this is the most important step.
- Leave it ventilated. Keep vents open, or the door slightly ajar in a protected indoor space, so air keeps moving.
Outdoor considerations
Coming back
When you return, give it a quick clean and a good heat-up-and-dry before the first proper session, check the heater and controls, and inspect the wood and seals. Stored clean and dry, a sauna picks up right where it left off — fresh, warm and ready.
Storing a sauna dry
The single rule for storing a sauna between seasons is to store it dry. A clean, bone-dry sauna with airflow will not grow mould or develop a smell while idle; a sauna packed away damp will do both. So before it sits unused, deep-clean the benches, floor, drain and duckboards, refresh the stones and benches, and then dry it completely by running the heater and ventilation to drive out all moisture.
Leave it ventilated while it waits — vents open, or the door slightly ajar in a protected indoor space — so air keeps moving. For an outdoor sauna sitting through winter, also make sure the roof sheds snow, the foundation drains so water does not pool and freeze, and the door seals against the weather.
Coming back is easy if it was stored well. Give it a quick clean and a good heat-up-and-dry before the first proper session, check the heater and controls, and inspect the wood and seals. Stored clean and dry, a sauna picks up right where it left off — fresh, warm and ready.
Frequently asked questions
How do you store a sauna when not in use?
Deep-clean it, refresh the stones and benches, and dry it completely with the heater and ventilation, then keep it ventilated. Store it clean and bone-dry so no moisture, smell or mould develops.
Do you need to maintain a sauna you are not using?
Before a long idle period, yes — clean and dry it thoroughly, and for outdoor saunas ensure the roof sheds snow and drainage clears. A little care prevents smell and mould while it waits.
Can a sauna get mouldy if left unused?
Only if stored damp. A clean, fully dried sauna with airflow will not grow mould while idle. Moisture left inside is what causes problems, so drying it thoroughly first is essential.
What should you do before using a sauna after a long break?
Give it a quick clean and a good heat-up-and-dry, check the heater and controls, and inspect the wood and seals. Stored clean and dry, it will be ready to use again quickly.
How do you protect an outdoor sauna over winter if unused?
Ensure the roof sheds snow, the foundation drains so water does not pool and freeze, and the door seals against weather, in addition to storing it clean and dry inside.
How do you store a sauna between seasons?
Deep-clean it, refresh the stones and benches, dry it completely with the heater and ventilation, then keep it ventilated. The single rule is to store it clean and bone-dry so no moisture, smell or mould develops.
Can a sauna get mouldy if left unused?
Only if stored damp. A clean, fully dried sauna with airflow will not grow mould while idle. Moisture left inside is what causes problems, so drying it thoroughly first is essential.
How do you protect an outdoor sauna over an unused winter?
Store it clean and dry inside, and make sure the roof sheds snow, the foundation drains so water does not pool and freeze, and the door seals against the weather.
What should you do before using a sauna after a long break?
Give it a quick clean and a good heat-up-and-dry, check the heater and controls, and inspect the wood and seals. Stored clean and dry, it will be ready to use again quickly.
