Colorado Runner - Colorado's running news, events and results source

The Academy of Nutrition and Dietetics (AND) is the nation's largest group of food and nutrition professionals. At their annual convention, members presented research and updates that might be of interest to you.

The Denver Colfax Marathon, presented by Cigna Healthcare, is proud to open registration for its 20th race weekend in the Mile High City. The marathon weekend will take place May 15-17, 2026, marking two decades of deep tradition in Denver.

Running USA, the premier trade organization for the road race industry, recently released its list of the 100 Largest Road Races in the United States for 2025, with the BOLDERBoulder ranking as the third-largest race in the country and the largest 10K in the United States.