The sauna is at least 2,000 years old in a form you would recognize: the Finnish Sauna Society dates the log sauna to the first centuries AD, and the oldest written description of a sweat bath, Herodotus on the Scythians, is about 2,400 years old. Since then the story is mostly about fuel and smoke: smoke saunas until the 1800s, chimney stoves that overtook them in rural Finland only after the 1940s, the electric heater in 1938, and infrared cabins descended from an 1891 light bath.
By Fuentes, founder of Lanoviss · October 2026
Most sauna histories online open with a date like 7000 BC and never say where it comes from. This one separates what is documented from what is merely repeated, puts a source on every date, and says plainly where the record runs out.
How old is the sauna, really?
Older than any date anyone can prove. The oldest known Finnish saunas were pits dug into a slope, used mainly as winter dwellings, with a hearth of heated stones (Wikipedia). Log saunas became common in the first centuries AD, and until the 1800s nearly all of them were smoke saunas with no chimney or windows (YIT, citing the Finnish Sauna Society).
The bigger numbers online are another matter. We could not find an excavation report behind the popular claims of 7000 BC or 2000 BC, and the Neolithic stone houses of Orkney, around 4000 BC, that may have used steam remain speculative (same Wikipedia article).
| Claim you will read | What the evidence supports | Source |
|---|---|---|
| Saunas date to 7000 BC | No excavation cited by the pages that repeat it | Our search, October 2026 |
| Saunas date to 2000 BC | Repeated, not sourced | Our search, October 2026 |
| Neolithic Orkney used steam, about 4000 BC | Possible, but speculative | Wikipedia |
| Scythian sweat tents, 5th century BC | Documented in writing | Herodotus, Histories 4.73–75 |
| Log saunas common in Finland from the first centuries AD | The Finnish Sauna Society's dating | YIT / Finnish Sauna Society |
What is the oldest written description of a sauna?
Herodotus, in the fifth century BC, describing the Scythians. After a burial, he writes, they lean three poles together, cover them with felt and throw hemp seed onto red-hot stones; in G. C. Macaulay's translation they "creep under the felt coverings," howl with pleasure, and use the vapour instead of ever washing in water (Histories 4.75).
We have a selfish reason to like this passage: the first sweat bath on record was a felt tent, made of the same pressed wool as our one-piece felt sauna hat. The next written records come from Russia and Korea. The 12th-century Primary Chronicle describes bathhouses around Novgorod (see banya vs Finnish sauna), and Korea's domed stone hanjeungmak is recorded in the 15th-century Annals of the Joseon Dynasty (Wikipedia).
[FOTO PROPIA: a Lanoviss hat next to an offcut of the same 3 mm pressed felt, to show the material Herodotus describes.]
What is a smoke sauna?
The original Finnish sauna: a log room with no chimney. A fire burned under a heap of stones, the kiuas, for about 6–8 hours, the smoke was let out before bathing, and a well-heated smoke sauna holds its heat for up to 12 hours (Wikipedia). Finland's official country site says most Finns still consider it the best kind, for its soft heat and its smell of wood smoke (thisisFINLAND).
It was also the cleanest room on the farm. Until the mid-1900s Finnish women often gave birth in the sauna, the dead were washed there before burial, and in western Finland it doubled as the place to cure meat, dry malt and do laundry (YIT). In south-east Estonia the whole practice, from tying whisks to smoking meat in the sauna, joined UNESCO's intangible heritage list in 2014 as the smoke sauna tradition of Võromaa (UNESCO).
When did saunas get chimneys?
Gradually, over about a century. Industrialisation brought the metal wood stove with stones on top and a chimney (Wikipedia); from the late 1800s Finnish cities built shared block saunas, where the Saturday sauna became the working-class bath; and in the countryside the chimney sauna only overtook the smoke sauna after the 1940s (YIT).
The oldest public sauna still operating in Finland comes from that era: Rajaportti in Tampere, built in 1906 and still heated with wood. Its masonry stove burns metre-long logs to heat more than a tonne of stones, and the only notable change since was a 1930s wall that split the men's and women's washrooms (Visit Tampere).
When was the electric sauna heater invented?
In 1938, by Metos Ltd of Vaasa, Finland (Wikipedia). Electricity moved the sauna indoors: shared saunas in apartment buildings became standard in the suburban building boom of the 1960s, and from the 1970s saunas went into individual flats (YIT).
Today Finland's government puts the count at about 3.2 million saunas for 5.5 million people, with almost 90% of Finns bathing at least once a week (Finnish Government, 2020). Official registers confirm at least 2 million, so treat the higher number as the Finnish Sauna Society's estimate (Wikipedia).
How did the sauna spread beyond Finland?
With colonists and emigrants first, then soldiers and athletes. The Swedish colony on the Delaware River had a bathhouse at Governor Johan Printz's residence on Tinicum Island in the 1640s, and the oldest surviving immigrant sauna in North America is an 1868 smoke sauna near Cokato, Minnesota (PBS POV, excerpting Michael Nordskog's The Opposite of Cold). German soldiers who fought alongside Finland against the Soviet Union took the habit home after the Second World War (Wikipedia).
The 1952 Helsinki Olympics and a wave of magazine coverage made the sauna an American fad by the early 1960s (PBS POV). On 17 December 2020, sauna culture in Finland became the country's first entry on UNESCO's intangible heritage list (Finnish Government).
Where do infrared saunas come from?
From a cabinet of light bulbs in Michigan. John Harvey Kellogg built his incandescent light bath in 1891, a mirrored cabinet that in the version he later described held 48 bulbs, showed it at the 1893 Chicago World's Fair, and German makers sold copies across Europe; a 2022 paper in the Journal of Transatlantic Studies calls modern infrared saunas its descendants (Loignon, 2022).
Infrared cabins warm the body directly and run far cooler than a Finnish sauna, around 45–60 °C; our sauna temperature guide compares them. In Japan, cardiologists at Kagoshima University were already using a 60 °C far-infrared dry sauna, 15 minutes followed by 30 minutes' rest under a blanket, in a protocol called Waon therapy by 1999 (Kihara et al., 2009). We mention it as history, not as a health claim.
Sauna history timeline
Every date below is sourced in the sections above; the last column says what kind of evidence stands behind it.
| Date | Milestone | Evidence |
|---|---|---|
| 5th century BC | Herodotus describes Scythian sweat tents of felt over red-hot stones | Written source |
| First centuries AD | Log saunas become common in Finland | Finnish Sauna Society |
| 12th century | Primary Chronicle describes bathhouses around Novgorod | Written source |
| 15th century | Korean hanjeungmak recorded in the Annals of the Joseon Dynasty | Written source |
| 1640s | Bathhouse at Governor Printz's residence, New Sweden | Nordskog (2010) |
| 1868 | Smoke sauna built near Cokato, Minnesota | Building still standing |
| Late 1800s | Shared city-block saunas spread in Finland | Finnish Sauna Society |
| 1891 | Kellogg builds his incandescent light bath | Journal of Transatlantic Studies (2022) |
| 1906 | Rajaportti public sauna opens in Tampere | Still operating |
| 1938 | Metos introduces the electric sauna heater | Wikipedia |
| After the 1940s | Chimney saunas overtake smoke saunas in rural Finland | Finnish Sauna Society |
| 1952–1963 | Helsinki Olympics, then the American sauna fad | Nordskog (2010) |
| 1960s–1970s | Saunas move into apartment buildings, then into individual flats | Finnish Sauna Society |
| By 1999 | 60 °C far-infrared Waon protocol in clinical use in Japan | Kihara et al. (2009) |
| 2014 | Võro smoke sauna tradition joins UNESCO's list | UNESCO |
| 2020 | Sauna culture in Finland joins UNESCO's list | Finnish Government |
Frequently asked questions
Who invented the sauna?
No single person. Sweat bathing shows up in many early cultures, from the Scythians Herodotus described to Slavic bathhouses and Korean stone kilns; what Finland gave the world is the word and the dry, stone-heated room most people now picture.
What does the word sauna mean?
It is the Finnish word for both the bath and the bathhouse, and the best-known Finnish loanword in many languages. Linguist Petri Kallio has proposed that it comes from an old Germanic word for a stack or heap, meaning the pile of stones at the heart of the room.
What is the oldest public sauna in Finland?
Rajaportti in Tampere, built in 1906 and still heated with wood. The sauna room holds about 12 people.
When did Finnish sauna culture join UNESCO's list?
On 17 December 2020, as Finland's first entry on the Representative List of the Intangible Cultural Heritage of Humanity. Estonia's Võro smoke sauna tradition had joined in 2014.
How many saunas are there in Finland?
About 3.2 million by the Finnish government's count, for 5.5 million people. Official registers confirm at least 2 million, so the higher figure is an estimate.
What is the difference between a smoke sauna and a chimney sauna?
Where the smoke goes. A smoke sauna has no chimney, so the fire heats the stones for hours and the smoke is vented before anyone bathes; a chimney sauna sends the smoke up a flue, so the room stays clean while the stove burns.
Fuentes is the founder of Lanoviss, which makes one product: a seamless sauna hat pressed from a single piece of 3 mm wool felt and shipped from Vancouver, British Columbia. Every date on this page links to its source, and where we could not find one, we say so. More about who makes it and why.
Related reading: löyly, the Finnish word your sauna is missing · banya vs Finnish sauna · ideal sauna temperature by type