Skill level and trail difficulty

Green circle (easiest)

• Most highly-developed class of trails (almost road like) with no steep hills and few obstacles.
• Intended for novice riders who have mastered the basic skills necessary for safe operation on well-developed trails.
• Also for those lacking the experience or desire to ride more difficult trails.
• Approximately 10% of trails in the system should be classified as "easiest."

Blue square (more difficult)

• Suitable for the majority of intermediate riders.
• More difficult trails are narrower with steeper hills and switchbacks and some moderate obstacles.
• Intended for OHV enthusiasts with well-developed skills seeking a reasonably challenging trail ride.
• Riders subjected to higher degree of risk and exposure.
• Approximately 80% of trails in the system should be classified as "more difficult."

Black diamond (most difficult)

• Most primitive class of trails requiring a high-level of skill and experience.
• Very steep grades, narrow trails, sharp alignments, rough or loose tread surfaces, and substantial obstacles.
• Suitable only for proficient or expert riders to test their machines—and their own skills and abilities.
• Approximately 10% of trails in the system should be classified as "most difficult."