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The NorthShore Inline Marathon

an event 26 years in the making

The History of the NorthShore Inline Marathon

Founded in 1996 by a group of dedicated inline skaters, the NorthShore Inline Marathon (NSIM), with its appealing course, quickly grew becoming one of the world's largest skating races. While inviting to all, the NSIM has had top notch competitors including Olympians, professional hockey players, professional speed skaters, and more. NSIM's race course is on the beautiful scenic drive in between Two Harbors and Duluth on Minnesota's North Shore of the majestic Lake Superior. Our race closely follows the route as the running event, Grandma's Marathon, that also takes place in Duluth, Minnesota. 

In 2015 NSIM decided to add a few additional events to its weekend adding our NorthShore Wheels Off Half Marathon and our 42k and 21k Rollerski races. We believe our event should be for all and drive to create a welcoming atmosphere for all skaters, runners, and skiers. In 2020 NSIM had one of its toughest years and unfortunately had to cancel their physical race due to the coronavirus that had shut down much of the United States. With that our team decided to create a virtual NorthShore which has also been added to our race list. We proudly host our events every year and are honored to be the largest skating marathon in North America.

Our Mission:

To foster national and international amateur inline skating competitions and to promote health and fitness through the organization, promotion, development, and execution of a recreational inline skating marathon and similar events.


Our Historic Race Map

Enjoy 26.2 miles point-to-point from the north shore community of Two Harbors to downtown Duluth along Minnesota's scenic North Shore of the powerful Lake Superior. Our unique race route brings competitors alongside beautiful lake views, through lush forests, and down rolling roads. Lastly, competitors get a more urban skate and will navigate through the tunnels of I-35 until they hit our finish line on the St. Louis Bay alongside the mighty William A. Irving.