Big Brothers Big Sisters of Flagstaff Dave McKay Memorial Half Marathon and 5K Run/Walk

Prepare for an unforgettable high-altitude challenge at the Big Brothers Big Sisters of Flagstaff Dave McKay Memorial Half Marathon and 5K Run/Walk, set for August 8, 2026, in scenic Flagstaff, AZ. This esteemed event, celebrating its 49th annual race, is not only Flagstaff's oldest race but also the second oldest half marathon in Arizona, offering distances of 13.1M, 5K, and a 1K Kid's Dash. The half marathon course begins at Thorpe Park and immediately climbs a steep urban trail onto Observatory Mesa, following dirt roads that boast spectacular views of the San Francisco Peaks. Runners should be prepared for significant elevation gains, with the course ranging from 6957 ft at the start to 7731 ft near the 7.5-mile mark, with most of the climbing concentrated in the first 1.25 miles. The 5K also takes place on Observatory Mesa, ensuring breathtaking scenery for all participants.

Runners can anticipate a challenging yet incredibly rewarding experience on what is widely regarded as one of the most scenic half marathons in the Southwest. Aid stations are strategically placed throughout the half marathon course, offering water, Gatorade, and even M&Ms at various points, starting from mile 1.25 and continuing through mile 12. For those from lower elevations, race organizers suggest pacing the initial climb and even power walking to conserve energy for the rest of the course. Typical race day conditions in August feature pleasant highs around 79F and lows around 52F, with a modest 14% chance of precipitation, providing ideal running weather.

Beyond the stunning course, this event is unique for its community spirit and charitable mission. All proceeds directly benefit the Big Brothers Big Sisters of Flagstaff Mentoring Programs, helping to ignite the power and promise of local youth. Half marathon finishers will be awarded a beautifully handcrafted wood carved medallion, while all 5K and half marathon participants receive a high-tech, long-sleeved Sweatvac racing shirt and free digital race photos. The experience kicks off with a complimentary pre-race pizza party, fostering camaraderie before the main event.