Key takeaways
- The bowline forms a fixed loop at the end of a rope.
- Its advantage: it stays relatively easy to untie even after heavy loading (unlike the figure-eight).
- It's used to tie around objects and, in secured variations, as a harness tie-in.
- A basic bowline can shake loose — it must be properly dressed, secured, and backed up.
From the nautical 'bowline', a line holding a sail's edge.
This is general educational information, not instruction. Tie-in knots are life-critical — learn and verify them hands-on with qualified instruction.
What the bowline is
The bowline is a knot that forms a fixed loop at the end of a rope, used in climbing to tie around objects (like a tree for an anchor) and, in secured variations, as an alternative harness tie-in.
Its advantage
The bowline’s key appeal is that it stays relatively easy to untie even after heavy loading — unlike the figure-eight follow-through, which cinches down hard. This makes it useful for climbers who take many big falls (like sport projectors) and find figure-eights a struggle to untie afterward.
A sport climber working a project takes dozens of hard falls a session, after which a figure-eight tie-in welds shut. They switch to a secured (Yosemite-finished) bowline with a backup, which they can still untie easily at day’s end — while always double-checking it’s dressed and secured before each climb.
Cautions
A basic bowline can work loose or capsize if not properly dressed and secured, so it’s never used as a plain tie-in. Climbers who use it use a secured variation and always add a backup knot. The figure-eight follow-through remains the standard, easily inspectable tie-in; the bowline is an advanced alternative requiring care, and one of several climbing knots.
The bottom line
The bowline forms a fixed loop and is prized in climbing for one thing: it stays easy to untie even after heavy loading, unlike the cinch-down figure-eight. But a plain bowline can shake loose, so it's used only in secured variations with a backup — and the figure-eight follow-through remains the standard, inspectable tie-in. The bowline is an advanced tool that demands proper dressing and backup.
Frequently asked questions
What is a bowline used for in climbing?
The bowline forms a fixed loop at the end of a rope. In climbing it's used to tie the rope around objects (like a tree for an anchor) and, in secured variations, as an alternative tie-in knot to the harness. Its main appeal is that it stays relatively easy to untie even after holding heavy loads.
Why do some climbers use a bowline to tie in?
Because, unlike the figure-eight follow-through, a bowline doesn't cinch down hard and remains easy to untie even after repeated heavy falls — useful for climbers who take many big falls (like sport projectors) and find figure-eights become a struggle to untie. However, this is only done with a properly secured bowline variation and a backup, because a basic bowline is less secure.
Is the bowline safe for climbing?
A basic bowline can work loose or capsize if it's not properly dressed and secured, so it's not used as a plain tie-in. Climbers who use a bowline tie-in use a secured variation (such as a double or Yosemite-finished bowline) and always add a backup knot. The figure-eight follow-through remains the standard, most-recommended tie-in because it's secure and easy to inspect; the bowline is an advanced alternative requiring care.
Sources
- Climbing knots — American Alpine Club
- Knots & rope work — The Mountaineers