- NorthShore Inline Marathon
About this race
Founded in 1996, the NorthShore Inline Marathon is dedicated to spreading the love of inline skating and overall fitness. Every year thousands of athletes of all ages come to Duluth to participate in this one-of-a-kind event. The NSIM offers a historic route, great views, and an even better community. It has been called one of the best inline marathons in the world by countless publications and has become a tradition for many. Come join us this year for our 28th year of skating.
Our event also includes our running division, which hosts two breathtaking runs. The first is the St. Luke's Half Marathon, one of Minnesota's most beautiful half marathons. This event begins on the scenic North Shore highway, with runners making their way through the Northland woods, passing through the tunnels of Interstate 35, and finishing alongside the iconic William A. Irvin. Our second race, the Finden Marketing Tunnel 10k, offers runners a unique experience of traversing the I-35 tunnels, covering 6 miles of interstate before finishing near the William A. Irvin.
Lastly, our FinnSisu Ski Division is an emerging part of our race series. It offers roller skiers of all skill levels two options: a 42k and a 21k Rollerski. Participants can ski alongside over 2,000 inline skaters, immersing themselves in the event's lively atmosphere!
Bring friends, make memories, and skate on!
Pick your distance
Running
Northern Lights Foundation Kids Sprint: RUN
Ages 14 & Under Kids may register for one event or BOTH events: Inline Skating & Running * BOTH registration forms must be completed if participating in both the Inline Skating and Running events
Aspirus Health Half Marathon Run
Finden Marketing Tunnel 10k Run
Nordic ice skating
Northern Lights Foundation Kids Sprint: INLINE SKATE
Ages 14 & Under Kids may register for one event or BOTH events: Inline Skating & Running * BOTH registration forms must be completed if participating in both the Inline Skating and Running events
NorthShore Inline Marathon
Combined 39.3 Mile Skate
Half Marathon Skate
Tunnel 10k Skate
Skiing
FinnSisu Rollerski Marathon
Marwe Half Marathon Rollerski
Typical race-day weather
Based on 5 years of Open-Meteo archive data for this event's race dates in Duluth, plus the 3 days either side.
The sun rises at 6:48 AM and sets at 7:16 PM local time (CDT) in Duluth on September 17, 2027 — 12h 28m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
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Other races near Duluth
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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 29 Duluth events
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