Register for Colfax Marathon Through May 16

Time is running out to register for the 2nd annual Colorado Colfax marathon. The marathon, held on Sun. May 20, begins at Aurora Sports Park and ends at Colorado Mills. The marathon cuts through the heart of Denver on one of America's longest thoroughfares. If you don't want to go the whole distance of a marathon, you can register for a half-marathon, 10K or 5K instead. Late registration ends May 16.

• Colorado Colfax Marathon
• Denver Gyms and Fitness Centers