SATURDAY, OCTOBER 4th, 2025

UPDATE:  WE HAVE PARTNERED WITH SPARTAN!!!   ALL NATICOOK CHALLENGE REGISTRATIONS WILL ALSO GET A COMPLEMTARY RACE CODE TO AN END OF 2025 OR 2026  SPARTAN RACE!!! (taxes and fees not included, race code issued after the Naticook Challenge)

The Naticook Challenge 5K Obstacle Course Race returns to Wasserman Park on Saturday October 4th for it's sixth year. Come and join Merrimack Parks & Recreation for this Annual 5K Race that is both fun and challenging to test your abilities. 

If you are new to this, you may be asking yourself, what is an obstacle  course race? It is a trail based race that takes place within Wasserman  Park as well as on the  Conservation Trails that border the Park and  that involves challenges for the other parts of your body (crawling,  climbing, or hanging for examples).  

The course is a 5k distance and includes 8 or more  beginner to  intermediate level obstacles. There are obstacle bypass  exercises   available if unable to complete an obstacle. 

The first 200 registered participants will receive an official Naticook Challenge  Runners T-Shirt. All registered participants will also earn a completion medal. 

We are currently looking for volunteers to help us on Race Day for check-in, course monitors and awards. Volunteers are needed from 8:00 am - 10:30 am. If interested, click here to register.