| Range | Class 1 to Class 5 |
| Class 1-2 | Walking to easy hiking |
| Class 3-4 | Scrambling, rising exposure |
| Class 5 | Technical roped climbing |
The Yosemite class rating system describes how difficult and exposed terrain is to travel, from Class 1 to Class 5. Class 1 is walking, Class 2-3 is steeper hiking and easy scrambling, Class 4 is exposed scrambling where many use a rope, and Class 5 is technical roped climbing. It helps hikers gauge a route’s seriousness.
The scale
Class 1 (trail walking) → Class 2 (rough off-trail) → Class 3 (scrambling with exposure) → Class 4 (exposed, often roped) → Class 5 (technical climbing).
Relation to YDS
It’s the basis of the Yosemite Decimal System — Class 5 splits into the 5.0-5.15 climbing grades. Higher classes add exposure.
Frequently asked questions
What is the Yosemite class system?
It rates how hard terrain is to travel on a 1-to-5 scale: Class 1 is hiking on a trail, Class 2 is rougher off-trail hiking, Class 3 is scrambling using your hands with some exposure, Class 4 is exposed scrambling where a fall could be fatal and many use a rope, and Class 5 is technical climbing.
What is Class 3 hiking?
Class 3 is scrambling: steep enough that you use your hands for balance and progress, with some exposure, but not so hard or exposed that most people need a rope. It sits between regular hiking and roped climbing.
How does the class rating relate to YDS?
The class system is the foundation of the Yosemite Decimal System (YDS). Classes 1-4 cover non-technical to scrambling terrain, while Class 5 is subdivided into the familiar 5.0-5.15 climbing grades. So class ratings and YDS are the same scale.
Sources
- Terrain grading — The Mountaineers