Bulletins

Yoho National Park

Restricted activity order: Custodial groups in avalanche terrain

Issued: November 15, 2025

Ends: April 30, 2026

A “custodial group” means a group affiliated with an institution, where at least one person is below the age of majority and that minor is not in the company of his/her parent or legal guardian. Institutions include but are not limited to schools, Scouts/Guides, churches, clubs, cadets, and community youth programs.

Note

  1. Subject to the following restrictions, authorization for a custodial group to travel in Avalanche Terrain Exposure Scale (ATES) class 2 avalanche terrain may be granted by the Superintendent:
    • The custodial group must be led by a mountain, alpine or ski guide certified by the  Association of Canadian Mountain Guides or International Federation of Mountain Guide Associations.
    • Maximum group size is nine (9) persons plus certified guide(s).
    • Authorization for travel by a custodial group in class 2 terrain will only apply when the certified guide has rated the slope specific “Danger Rating” in that area to be ‘Low’ or ‘Moderate’. 
  2. Backcountry travel by a custodial group in areas of the Park designated as ATES class 3 avalanche terrain is prohibited. 
  3. Travel in ATES class 1 avalanche terrain is not restricted.

Avalanche Terrain Exposure Scale (ATES)

Learn more about the Avalanche Terrain Exposure Scale on the Avalanche Terrain Ratings page.

Simple

Class: 1

Terrain criteria: Exposure to low angle or primarily forested terrain. Some forest openings may involve the runout zones of infrequent avalanches. Many options to reduce or eliminate exposure. No glacier travel.

Challenging

Class: 2

Terrain criteria: Exposure to well-defined avalanche paths, starting zones or terrain traps; options exist to reduce or eliminate exposure with careful routefinding. Glacier travel is straightforward but crevasse hazards may exist.

Complex

Class: 3

Terrain criteria: Exposure to multiple overlapping avalanche paths or large expanses of steep, open terrain; multiple avalanche starting zones and terrain traps below; minimal options to reduce exposure. Complicated glacier travel with extensive crevasse bands or icefalls.

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