Trail races require specific gear to protect runners from unpredictable weather. UTMB Mont-Blanc mandates a basic kit, emphasizing protection against cold and precipitation. Runners must carry these items throughout the race, with checks along the course.

Washington’s Chuckanut 50K introduced a weather-dependent gear rule after hypothermic cases in 2025. Runners must carry certain gear if the temperature is 47 F (8.3 C) or colder. This rule highlights the importance of being prepared for mountain conditions. Read more trail coverage.

Ultra-Trail Australia by UTMB also stresses the importance of mandatory gear. The course passes through remote areas, making self-reliance crucial. Runners are advised to take extra items they would normally carry on long runs. Related: UTMB Highlights Trail Running's Competitive Edge.

This original Runner World brief is based on reporting from Canadian Running. Visit the source for its complete reporting, context and any later corrections.