Key takeaways
- Simul-climbing means both roped climbers move at the same time, with protection between them.
- It speeds travel on long, moderate terrain (alpine ridges, easy routes) versus pitched climbing.
- It's higher-risk: a fall by either climber can pull the other off, so it's used on easy ground.
- It's an advanced technique requiring experience, communication, and good judgment.
Short for 'simultaneous climbing'.
This is general educational information, not training. Simul-climbing is an advanced, higher-risk technique — learn it from experienced mentors.
What simul-climbing is
Simul-climbing (simultaneous climbing) is a technique where both roped climbers move at the same time, connected by the rope with protection placed between them — rather than one climbing while the other belays from a stance. The leader places protection as they go and the follower removes it, both moving together to cover ground fast.
When it’s used
Simul-climbing speeds travel over long stretches of easier terrain — alpine ridges, moderate snow and rock — where stopping to belay every pitch would be too slow. Since speed limits exposure to weather and hazards, it’s a key efficiency tool in alpine climbing for competent parties on terrain well within their ability.
On a long, moderate alpine ridge, a team simul-climbs to save hours — both moving together with several pieces of protection between them, the leader placing gear and the follower cleaning it — covering ground far faster than pitching it out, on terrain easy enough that a fall is unlikely.
The risks
The catch: with both climbers moving, a fall by either can pull the other off — there’s no fixed belay. Protection between them (a running belay) and progress-capture devices reduce this, but consequences are serious. So it’s reserved for easy ground and demands experience, communication, and judgment.
The bottom line
Simul-climbing trades the security of pitched belaying for speed: both climbers move at once, roped together with protection between them, to cover long, moderate terrain efficiently. That speed is a real safety asset in the mountains — but the catch is that a fall by either can pull the other off, so it's an advanced technique reserved for easy ground, demanding experience and judgment.
Frequently asked questions
What is simul-climbing?
Simul-climbing (simultaneous climbing) is a roped technique where both climbers move at the same time, connected by the rope with protection placed between them, instead of the usual method where one climbs while the other belays from a fixed stance. The leader places protection as they go and the follower removes it, with both moving together to cover ground faster.
When is simul-climbing used?
It's used to move fast and efficiently over long stretches of easier terrain — alpine ridges, moderate snow and rock, and approach climbing — where stopping to belay every pitch would be too slow. In the mountains, speed is itself a safety factor (limiting exposure to weather and hazards), so simul-climbing is a key efficiency tool for competent parties on terrain well within their ability.
Why is simul-climbing risky?
Because both climbers are moving at once, a fall by either one can pull the other off — there's no fixed belay to catch a fall in the usual way. Protection between the climbers mitigates this, and devices like progress-capture pulleys can help, but the consequences of a fall are serious. It's therefore reserved for terrain easy enough that falling is unlikely, and demands experience, communication, and sound judgment.
Sources
- Alpine technique & efficiency — American Alpine Club
- Roped travel — The Mountaineers