What is the suggested minimum flight planning altitude over mountains during winter?

The suggested minimum flight planning altitude over mountains during winter is typically set to ensure safety in winter weather conditions, where terrain and weather can be more challenging. The safest practice is to elevate your altitude above the Minimum Enroute Altitude (MEA) to account for potential obstacles such as snow-covered terrain, which can obscure your ability to visually gauge elevation.

Choosing an altitude of 1,000 feet above the published MEA provides an additional buffer that helps account for any inaccuracies in navigation, allows for a margin of safety in case of in-flight emergencies, and accommodates for downdrafts, which can be more severe in winter. This precaution is crucial as winter weather can lead to lower visibility and increased risks of turbulence near mountainous areas.

By planning at this heightened altitude, pilots are better positioned to navigate safely in complex terrain, while also being able to react to unexpected changes in weather conditions. This additional vertical space is essential for maintaining a safe flight profile, especially when flying over mountainous regions during the winter months.