Last year, I found a forum thread on Whiteblaze with a debate about “what is the steepest climb on the Appalachian Trail?” I thought about it for a while, then decided I might use my elevation profile data for the AT, plus my programming knowledge, to analyze the climbs of the AT to come up with a good estimate of what really is the steepest part of the Appalachian Trail.

My method for measuring the steepest climbs requires a little bit of explanation: the program broke the trail down into 0.5 mile segments (initially 1.0 miles, but I decided 0.5 would give better results), including overlapping segments (0.0 to 0.5, 0.1 to 0.6, 0.2 to 0.7, etc.). It first sorted through all segments to find the largest elevation change in any segment, then discarded any overlapping segments (if 2.0 to 2.5 was steeper than 2.2 to 2.7, the latter was discarded). Shortening the length of a measured segment might provide a more accurate measure of the absolutely steepest climbs, but I had to make a cut-off somewhere, since if we looked only at 0.1 mile segments we might just find flukes in the elevation data, like a single ladder that climbs over a boulder.

More recently, I applied the same measure to the PCT as a fun way to compare the two trails. Obviously, the steepness of the two trails doesn’t entirely reflect the challenges, but it’s fun to look at. Also, since my apps have the same vertical exaggeration for all elevation profiles, we can look at the profile of the AT and PCT and really see how they compare.

Here are the results:

Edit: Bobcat requested I run the numbers for the CDT as well, so I’ve added them as of 1/6/2015. The Overall gain/loss is calculated only with the CDT Proper, while the steepest climbs include the various alternate routes as mapped by Bear Creek Survey.