Longmont Half Marathon & 5k Tue July 4 @ 6:00 am - 11:00 am Celebrate Independence Day with us, and join the Half Marathon or 5k distance! Walkers and Runners of all abilities welcome! 5K, Half Marathon West : Running Register Organizer 3W Races Email: info@3wraces.com View Organizer Website Location Longmont, Colorado Longmont, CO 80501 United States + Google Map