Key takeaways
- A snow anchor secures climbers to a snow slope where there's no rock.
- Types: driven/buried pickets, buried 'deadman' anchors, and carved snow bollards.
- Holding power depends entirely on snow quality and correct construction.
- Buried (deadman) placements are usually far stronger than driven ones in soft snow.
This is general educational information, not training. Snow anchoring is a skilled, high-consequence technique — learn it from qualified instructors.
What a snow anchor is
A snow anchor is a system for securing climbers to a snow slope — for belaying, rappelling, or crevasse rescue — where there’s no rock to use. Instead of rock gear, it relies on the snow itself, using buried or driven gear or a feature carved from the snow.
The types
- Snow picket — driven in vertically (firm snow) or buried horizontally as a ‘deadman’ (much stronger in soft snow).
- Buried deadman — a picket, ice axe, or other object set horizontally in a trench.
- Snow bollard — a teardrop mound carved from the snow, with the rope looped around it.
Needing to belay across a snow slope with no rock, a mountaineer judges the snow too soft for a driven picket, so they bury one horizontally as a deadman in a slot trench, clip the rope to its midpoint, test it hard, and back it up — getting far more holding power than a vertical placement would give.
Why snow quality is everything
A snow anchor’s strength comes entirely from the snow and the construction, and snow ranges from bomber to dangerously weak. Mountaineers assess the conditions, pick the strongest method (often a buried deadman in soft snow), test it, and back up or equalize snow anchors wherever possible.
The bottom line
A snow anchor secures climbers to a snow slope where rock gear is useless — via pickets, buried deadman anchors, or carved snow bollards. Its strength depends entirely on the snow and the construction, so mountaineers assess conditions, favor stronger buried placements in soft snow, test the anchor, and back it up. It's a skilled, high-consequence technique to learn hands-on.
Frequently asked questions
What is a snow anchor?
A snow anchor is a system for securing climbers to a snow slope — for belaying, rappelling, or crevasse rescue — in terrain where there's no rock to anchor to. Instead, the anchor relies on the snow itself, using buried or driven gear or a feature carved from the snow to create a hold.
What are the types of snow anchor?
Common types include the snow picket (driven in vertically or, more strongly, buried horizontally as a 'deadman'), buried deadman anchors using a picket, ice axe, or other object set horizontally in a trench, and the snow bollard — a teardrop-shaped mound carved out of the snow that the rope is looped around. The choice depends on snow conditions and available gear.
Why is snow quality so important for snow anchors?
Because the anchor's strength comes from the snow itself, which varies enormously from firm and supportive to soft and weak. A placement that's bomber in dense, consolidated snow may be dangerously weak in soft snow. Mountaineers assess the snow, choose the strongest method for the conditions (often a buried deadman), test the anchor, and frequently back up or equalize snow anchors.
Sources
- Snow anchors & glacier travel — American Alpine Club
- Mountaineering: The Freedom of the Hills — The Mountaineers