The new, bigger and better Boulder Res Marathon Series is brought to you by BBSC Endurance Running. A race production you can count on to bring you the best quality race experience at an affordable price. Race during the best time of the year, in the running mecca of Boulder. You'll travel on paved roads, dirt trails and get to experience the wildlife around the Res. This course offers spectacular views of Boulder's Flatirons and takes you along the water's edge. Of course we'll be waiting to pour you a beer at the finish! Click here to register.