When is a bivouac a bivouac? The tentless night in Swiss law, and what the emergency excuse is worth

No Swiss enactment defines the bivouac, at any level. In February 2026 the Graubünden high court ranked the everyday words instead: camping means the night in a tent or a vehicle, overnighting is the wider term, and the night in a bivy bag sits outside camping.¹ The exact verb of the rule at your spot therefore decides what your shelter is worth. The emergency bivouac is a separate question: a real emergency is lawful everywhere, and a planned night gains nothing from the label.⁵

No law defines the bivouac

Federal law does not know the word. Across the enactments in force, the verb biwakieren appears zero times, in German, French or Italian. The noun turns up where soldiers sleep, the army houses its troops in barracks, billets and Biwaks, and once in a sports-funding annex that grades hikes by whether they include a night in a bivouac above the treeline. No text defines it, and no federal rule prohibits anything under that name.

The definitions people use come from elsewhere. The Swiss Alpine Club needs one line: bivouacking is the night without a tent, under the open sky, in an igloo or a snow cave, and camping is the night in a small tent.² Since February 2026 there is also a court version. The Graubünden high court had to decide whether a woman in a parked car had been camping, and wrote the hierarchy down: camping, by ordinary usage, means overnighting in a tent or a caravan, and overnighting is the wider word, which also covers the night in a bivouac or under the bare sky. Her CHF 150 fine was struck.¹

Ticino complicates the picture from the other side. Its camping act bans camping outside official sites, then exempts, in the statute itself, tent-pitching for bivouac purposes in the mountains.⁶ There the bivouac is defined by the practice rather than the missing tent: one transit night, high up, gone by morning. The Appenzell Innerrhoden government tolerates bivouacking with simple tents overnight in the same spirit. One word, two meanings, and the second one includes a small tent.

Tent, bivy bag, tarp: the verb decides

Whether your shelter matters depends on the words in the rule at your spot, and Swiss rules choose surprisingly different ones. The one federal camping ban, inside the 42 federal game reserves, prohibits free tenting and camping at CHF 150.³ After the Graubünden ruling, a bivy bag arguably falls outside camping. No court has tested that reading inside a game reserve, the norm exists to keep wildlife undisturbed at night, and a warden writes the fine long before anyone discusses linguistics. We would not bet a night on it.

Other drafters close the gap on purpose. The National Park bans bivouacking by name, CHF 200, and leaving the marked trails, CHF 250, so gear never enters the question.⁴ Twenty-seven of the twenty-eight camping clauses in Bern’s protected-area annex ban camping and bivouacking in one breath.⁸ Uri’s newest reserve rules say lagern, zelten oder campieren, and lagern reaches the sleeping bag with nothing over it. At the other end sit the device lists: Obwalden bans erecting tents, caravans and motorhomes, Pontresina and Grindelwald use the same shape, and a bivy bag is none of the listed things.⁷

The tarp is the least settled object in the whole file. We found exactly one Swiss norm that names it: Graubünden’s hunting ordinance, which forbids hunters to overnight under tents and tarps, Zelte und Blachen, outside campsites. Every other text is silent, and a commune that defines camping through similar shelters would read a pitched tarp as a tent. Nobody has litigated it. And where nothing is written at all, which is most high ground in Switzerland, none of this matters. The Federal Supreme Court has said there is no Scandinavian-style everyman’s right, so the missing rule is no licence to ignore a landowner.⁹ But absent a written ban, there is nothing to fine, whatever you carry.

The emergency bivouac, tested against the law

The excuse has a real legal core, which is exactly why it fails when borrowed. Swiss criminal law recognises necessity: whoever commits an offence to save themselves or another person from an immediate danger that cannot be averted any other way acts lawfully, provided the interest saved outweighs the one harmed.⁵ Benighted on terrain you cannot safely descend, caught by a weather break, injured: staying put is then the safest available act, a life outweighs a camping fine by any measure, and the night is lawful. Everywhere. Including the National Park.

The published record backs this up. In every decision we found that involves a forced bivouac, a 1957 ski-tour tragedy in the Glarus Alps, a storm night in a snow hole on the Biancograt, a benighted party on the Weisshorn, the courts treat the emergency bivouac as the prudent, required move, and not one of them so much as discusses fining the night itself.⁵ The 1957 case carries the sobering flip side: the tour leader was convicted because he executed the forced bivouac carelessly and his wife died of the cold. The emergency justifies staying. It then demands you do it properly.

A planned night borrows none of this. Necessity begins with an immediate danger, and a sunset arrival with tent, mat, stove and tripod is the opposite of one. The label changes nothing about the facts on the ground, and the facts are what get judged. Since a 2007 revision, even a self-inflicted predicament, started too late, forecast ignored, no longer blocks the defence automatically, though the rescue bill can still land on you.⁵ The honest summary: if the emergency was real, you need no excuse. If it was not, none exists.

The campfire lines, checked

Five sentences you hear around wild camping in Switzerland, held against the texts. The links go to the pages where we unpack each piece.

• “If anyone asks, it’s an emergency bivouac”Worthless

  Necessity turns on facts that existed before you spoke: an immediate danger, no safer option. A planned night fails the first element, and the gear tells the story. Real emergencies were never going to be fined.⁵

• “No tent means it’s always legal”Only where written

  True under device-tied rules like Obwalden’s, and arguable under plain camping bans since the 2026 ruling. False wherever bivouacking is banned by name: the National Park, 27 of Bern’s 28 reserve clauses.⁴

• “The bivouac is a defined legal category”False

  No Swiss enactment defines it. The SAC sheet and, since 2026, a Graubünden ruling fill the gap: the night without a tent or a vehicle.¹

• “A tarp counts as a bivouac”Untested

  One hunting norm names tarps and bans them next to tents. Every other text is silent, and communes that define camping through similar shelters would read a pitched tarp as a tent. Nobody has litigated it.

• “One night is always allowed”Two cantons

  Written law only in Ticino, which exempts the mountain bivouac, and Obwalden, which allows the single night outright.⁶ Elsewhere it is tolerance, or simply the absence of a rule. Inside protected areas, one night is as banned as ten.⁷