Key takeaways
- The crux is the hardest move or section of a climb — the part most likely to stop you.
- A route's grade is largely set by the difficulty of its crux.
- Climbers plan beta, conserve energy, and chalk up specifically for the crux.
- A route can have one crux or several; the term also generally means 'the hardest part' of any challenge.
From Latin 'crux' (cross); figuratively a central, decisive difficulty.
What the crux is
The crux is the hardest move or section of a climbing route or boulder problem — the part that demands the most skill, strength, or commitment and is most likely to stop a climber. Getting through the crux is usually the key to completing the climb, which is why climbers obsess over it.
The crux sets the grade
A route’s overall difficulty is largely determined by its crux. A climb can be straightforward throughout except for one desperate move, and that single move can define the grade of the entire route — which is why a route’s difficulty often comes down to one short, decisive sequence.
On a route that’s easy until a blank bulge two-thirds up, a climber climbs efficiently to save energy, chalks up at the last rest, works out the beta for the bulge, and commits fully through it — knowing that crux is the whole climb.
How climbers approach it
They plan around the crux: rehearsing the sequence, conserving energy on easier ground to arrive fresh (not pumped), and committing through the hard moves. On a redpoint, the crux is what gets rehearsed most. The word has even entered everyday speech for ‘the decisive hard part’ of anything.
The bottom line
The crux is the make-or-break part of a climb — its hardest move or section, and usually what sets the grade. Climbers organize everything around it: dialing in beta, arriving fresh, and committing through the hard moves. Send the crux and you've usually sent the route; the term has even entered everyday language for 'the decisive hard part.'
Frequently asked questions
What is the crux of a climb?
The crux is the single hardest move or sequence on a route or boulder problem — the part that requires the most skill, strength, or commitment and is most likely to cause a fall or stop a climber. Getting past the crux is usually the key to completing the climb.
How does the crux affect a route's grade?
A route's overall difficulty grade is largely determined by its hardest section — the crux. A climb might be easy throughout except for one very hard move, and that move can set the grade for the whole route, even if everything else is well within the climber's ability.
How do climbers approach the crux?
They plan around it: working out the specific sequence (beta), conserving energy on easier sections to arrive fresh, chalking up and setting feet carefully, and committing fully through the hard moves. On a redpoint, climbers often rehearse the crux repeatedly until they can link it into the full route.
Sources
- Climbing terminology — American Alpine Club
- Climbing fundamentals — UIAA