Explore TrailScore Rankings

TrailScore was born after countless repeats on a brutal stretch of trail that defied the tidy elevation charts we used to study it. The breakthrough was realizing that running unfolds in three dimensions—the side to side, the up and down, and the enduring grind of distance.

By quantifying variance across those axes, TrailScore expresses how physical a course truly feels. Switchback mazes, sawtooth climbs, and long days all leave their signature. Use the explorer below to compare active events and find courses that match your appetite.

• Horizontal variance measures the twists, terrain, and cambers constantly pulling you off balance.
• Vertical variance captures how steep and relentless the climbing and descending really are.
• Distance variance keeps score on how long you have to stay sharp.