| What it is | Minimalist overnight on a mountain |
| Shelter | Bivy sack or improvised |
| Types | Planned (light & fast) or forced (emergency) |
| Difficulty | Intermediate |
A bivouac, or bivy, is a minimalist overnight stop on a mountain, often unplanned, using little or no shelter beyond a bivy sack or improvised cover. Alpinists deliberately bivy to climb light and fast on long routes, while an unplanned ‘forced bivy’ is an emergency when a party is caught out overnight.
Planned vs forced
A planned bivy trades comfort for speed in alpine climbing; a forced bivy is being benighted unexpectedly.
Bivy vs camp
Less shelter than a camp — often just a bivy sack on a ledge.
Frequently asked questions
What is a bivouac?
A bivouac (bivy) is a stripped-down overnight stop in the mountains, using minimal shelter — often just a bivy sack, a ledge, or improvised cover rather than a tent. It lets climbers spend the night on a route while carrying very little.
What's the difference between a planned and a forced bivy?
A planned bivy is a deliberate choice to travel light and fast, accepting a spartan night out to climb a long route in good style. A forced bivy is unplanned — an emergency night out when a party is benighted by slow progress, bad weather, or an incident.
What's the difference between a bivouac and camping?
Camping usually means a tent and a chosen, comfortable site; bivouacking is more minimal and opportunistic — sleeping in a bivy sack on whatever ledge or hollow the mountain offers, prioritizing weight and speed over comfort.
Sources
- Alpine tactics — American Alpine Club