Belle Isle Beach · Detroit
Wood-fired cedar heat on the sand at Belle Isle. Cool off in the river or in a chair facing the skyline, then head back in for another round.
Book a seat
Saturday and Sunday sessions, ten seats each. Weekends go up as they are confirmed, and sessions run in snow, rain and everything else.
Live seat counts are unavailable right now. Please confirm by email before you travel.
More weekends are being confirmed for later in the season. Tell us you want them and we will email you the day they go up.
How it works
Heat, cool, sit, repeat as often as you like. There is no correct number of rounds. Most people here settle on two or three.
Ten to twenty minutes in the cedar room at 180 to 205°F. Ladle water across the stones and the heat arrives as a wave that moves through the room · Finns call it löyly, roughly LEU-lü, and the word means the wave rather than the water. The stove burns wood, so the heat comes on soft and the room smells of hot cedar. Sit high: heat stratifies, and the upper bench is where it gathers.
The Detroit River runs about 60°F in October and drops to the mid-30s by February, so this is a real cold plunge. Thirty seconds is genuinely plenty. Walk in, stand still, and let that first gasp pass. The whole skill is slowing your breathing while the cold settles. It raises noradrenaline, the alertness chemical, which is the clear head you notice afterwards. Prefer to stay dry? A chair in the open air cools you just as well.
Sit as long as you like, then head back into the heat. Nothing inside your 75 minutes runs on a clock, and the second round always lands better than the first. Keep drinking. A sauna pulls roughly a pint an hour out of you.
↻ The median session in Finland runs about fifteen minutes in the hot room. Nobody is counting.
Why it is worth the drive
Measured
what a 2025 review of the field reports
Heat raises core temperature enough that the body responds the way it does to moderate exercise. Vessels widen, heart rate climbs, plasma volume expands, and cells produce heat shock proteins that go on protecting them afterwards. The largest cohorts, following Finnish men for two decades, found that four to seven sessions a week tracked with roughly forty per cent lower all-cause mortality than one. In controlled trials, sauna taken after exercise improved oxygen uptake, systolic pressure and cholesterol more than the same exercise alone.
Unsettled
what the same review is careful about
Dosing is the weak point. Studies vary so much in temperature, length and frequency that the reviewers say no standard can be drawn from them yet, and the trend across the evidence is that three to seven sessions a week works better than one, which is not what a couple of weekends a month gives you. The risks are also real and mostly behavioural: fainting and slips account for most sauna injuries, and alcohol shows up in over half of the deaths. That is why we ask you to come sober and walk, never jump.
Sourced from Smith et al., An Overview of the Health and Fitness Benefits From Sauna Exposure, 2025. More studies, caveats and outright myths in the archive.
The setting
You are on an actual beach, on an island, with the Detroit skyline and the MacArthur Bridge across the water in front of you. Through the winter months the sun goes down almost directly behind the towers, which is why the evening sessions are the ones that fill first. Sand, open water, a city on the horizon and a hot cedar room to duck back into. It is beach weather all year if you bring the heat with you.
The site
A cedar trailer on the sand, a stack of split hardwood burning down all day, chairs facing the skyline and the river a short walk down the beach.
Practical
Liability
Everyone in the sauna signs their own, and it holds good for the whole season. It takes about a minute on a phone.
Add your guests’ emails at checkout and their links go straight to them. Anyone who arrives without one can scan the code on the sauna door.
somisauna.com/waiverQuestions
SOMi Sauna