September 16, 2017  at 8:45am marks the start of the largest inline marathon in North America! Enjoy the country’s most scenic and exciting inline skating event along the beautiful North Shore of Lake Superior! The 26.2 mile marathon begins just south of Two Harbors and continues along Scenic Hwy 61, rolling through the I-35 tunnels, and finishing at the Duluth Entertainment Convention Center (DECC).


Wave placement

In order to increase safety, ease crowding and allow for growth, all skaters will be placed in waves determined by past performances. Registrants with no previous NSIM history must choose their wave (one-time basis only). Participants with multiple finishes will receive wave placement based on their most forward wave qualification performance from the last three events. In the event of a three or more year ‘break in participation’ in the NSIM, a skater will be placed in their most recently qualified for wave. Wave placement will be made on a first received, first placed basis.
Wave placement “guide” for all ages 

Advanced Wave 1 1:12.00-1:18.99
Wave 2 1:19.00-1:24.99
Wave 3 1:25.00-1:30.99
Recreation Wave 1 1:31.00-1:45.99
Wave 2 1:46.00-1:59.99
Wave 3 2:00.00-3:30.00
Age Classes

Refer to the table above to reference the wave for which you have qualified. *Note – each skater’s best performance from the immediately preceding three events will be the current qualification. If there is a three year break in participation, the most recent qualification will be used.


Your race packet will contain an envelope with a Pro Chip, provided by Endurance Timing (our contracted timing company for the NorthShore events), which is a transmitting device for timing. Please read the specific instructions. These chips MUST be returned at the finish line as you leave the course. If your chip is not returned or lost a fee of $110 will be charged.


If you would like your name printed on your bib you must be registered by August 22nd. 

Do not fold, wrinkle, or alter these numbers. The large bib should be pinned to your chest or abdomen area or right hip.

Finisher Shirts

Shirts will be available at packet pickup for participants. Shirt sizes are unisex. If you register on Friday at the DECC we may not have a shirt available for you until Saturday morning after the race. Please check with the information booth after you have finished your event.

Transportation to the starting line

Buses begin loading from the DECC parking garage area on Railroad St. for the Half Marathon events at 5:00am, Full Marathon event buses begin loading at 7:00am. Please board promptly to insure that everyone arrives at the start lines on time. There is no parking available at the start lines.

Half Marathon skaters and runners: 5-5:45am
All elite skaters: 7:00-7:15am
Waves: Advanced 1-3 7:00-7:30am
Waves: Recreation 1 & 2 8:00-8:15am
Waves: Recreation 2 & 3 8:15-8:30am
NO Rec Wave 3 skaters are allowed to board the buses until 8:15am.

For those coming from Two Harbors, it is permissible to be dropped off at the Two Harbors Sonju car dealership. These skaters must ride a shuttle to the bus unloading area.  Due to insurance requirements, NO SKATES may be worn on the buses.
There will be one bus returning to Two Harbors from the DECC parking lot at 2:30 pm.


Medical support will be provided by Essentia Health partners on the course as well as at the finish line.


Water will be provided for skaters at the start and finish. There are five water stations (10 oz. bottles) along the race course. The stations are at approximately mile marker 6, 17, 21, and 23. Each skater is responsible for their own hydration and nutritional needs during the race. There are no “energy” gels or drinks at the water stations. Ubr water has generously donated all of the water bottles for our event.

Race day finisher food provided by Super One Foods

A fabulous array of bananas, apples, oranges, cookies and yogurt and all generously donated by SUPER ONE FOODS will be available at the finish line. Please support SUPER ONE FOODS. They’ve been amazing supporters of our event.


Porta-potties will be provided at the start as well as along the course at the water stations. The future of this race depends on participants respecting the property and rights of area residents and businesses. If nature calls, please use the available toilets.

Future NSIM Dates:

September 15, 2018