Interactive map of North American 100mi Races. Select a year or Click Play button to see years auto-scrolled. Select different trend graph using button below trend title.

Cursor mode:
Zoom mode allows you to pan the map and enable scroll zoom. Select mode allows you to click a location for autozoom, or hover a race.
Reset Zoom

Best viewed at a resolution of at least 1280x1024 or higher. Supports Chrome, Firefox, IE9+, Opera, and Safari. Inspired by this map by Johnathan Clayton posted at Extra thanks to Stan Jensen at (, Nick Marshall, John Price, and many others on the Ultralist for filling in some gaps. Even so, there are many more old 100mi races that are yet to be catalogued!

Know a 100mi race from past or present that you don't see? Email me on the Ultralist with additions or errors. Please include the Ultra name, location, and years held if known.

All-Time Race Listing:
* = Race Name Unknown. Location listed instead.
[0] = New race scheduled for the current year.