National Park Service Trail Ratings
Numerical Rating: less than 50
A hike that is generally suitable for anyone who enjoys walking. Mostly level or with a slight incline. Generally, less than 3 miles.
Numerical Rating: 50-100
A moderate hike is generally suitable for novice hikers who want a bit of a challenge. The terrain will involve a moderate incline and may have some steeper sections. Generally, 3 to 5 miles.
Numerical Rating: 100 –150
Moderately Strenuous hikes will generally be challenging for an unconditioned person. The terrain will involve a steady and often steep incline. Generally, 5 to 8 miles.
Numerical Rating: 150-200
Strenuous hikes will challenge most hikers. The hike will generally be longer and steeper, but may be deemed "Strenuous" because of the elevation gain. Generally, 7 to 10 miles.
Numerical Rating: greater than 200
Only well-conditioned and well-prepared hikers should attempt very strenuous hikes. The hike will generally be long and steep, and may include rock scrambling, stream crossings, and other challenging terrain. Generally, 8 miles and over.
Average Pace is:
1.5 miles per hour for easiest trails.
1.4 mph for moderate trails.
1.3 mph for moderately strenuous trails.
1.2 mph for strenuous and very strenuous trails.
This is hiking time and does not take into consideration fitness, exploration, rest, contemplation, etc.