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Women's Distance Festival 5K
Colorado Springs, CO • May 9, 2026
Five Star 5K, Mile of Smiles, and Wellness Festival
Brighton, CO • May 9, 2026
Hometown Half Marathon & 5k/10k - Colorado Springs
Colorado Springs, CO • May 9, 2026
Adventure Fest at 18 Road
Fruita, CO • May 9, 2026
Colterris Wine Run 5k
Palisade, CO • May 9, 2026
Parker Parks and Recreation Miles over the Meadow Mother’s Day 5K & Family Fun Trek
Parker, CO • May 9, 2026
Firehouse 5k @ Station 26 Brewing
Denver, CO • May 9, 2026
Cherry Creek Race for the Watershed 2026
Aurora, CO • May 9, 2026
HRCA Mother's Day 5K
Littleton, CO • May 9, 2026
Valkyrie Trail Race
Colorado Springs, CO • May 9, 2026
Run For The Trees - 2 Mile Fun Run
Loveland, CO • May 9, 2026
Run for the Trees - BSBF 2-Mile Run
Loveland, CO • May 9, 2026
Quad Rock 25 & 50 Mile Trail Races
Bellvue, CO • May 9, 2026
12 Hours of Mesa Verde
Cortez, CO • May 9, 2026
Run to the Shrine 2026 - Saturday, May 9
Colorado Springs, CO • May 9, 2026
Colorado Rockies Home Run 5K
Denver, CO • May 9, 2026
Celebration of Moms 5k & Family Fun Run
Buena Vista, CO • May 9, 2026
Kadet Football 5K
Colorado Springs, CO • May 9, 2026
Springs Splash & Dash
Colorado Springs, CO • May 9, 2026
The Great CO74 Trail Run
Kittredge, CO • May 9, 2026
Hometown Half Marathon & 5k/10k - Denver
Westminster, CO • May 10, 2026
Colorado Women's Classic - Westminster
Westminster, CO • May 10, 2026
Denver Mother's Day 5K
Denver, CO • May 10, 2026
Super Mom 5K/10K/Half - Colorado Springs
Colorado Springs, CO • May 10, 2026
Wings Space Race 5K
Denver, CO • May 10, 2026
Dash & Dine 5k #3
Boulder, CO • May 12, 2026
Know. Grow. GO RUN. 5K
Loveland, CO • May 15, 2026
Ram Party
Colorado Springs, CO • May 16, 2026
Gluten Free Gallop 5K
Littleton, CO • May 16, 2026
Spirit Challenge Run for Autism 10k and 5k
Steamboat Springs, CO • May 16, 2026
Endure Trail Runs
Divide, CO • May 16, 2026
Bubble Fun Run
Commerce City, CO • May 16, 2026
Stem Ciders at Acreage 5k
Lafayette, CO • May 16, 2026
Black Canyon Ascent
Montrose, CO • May 16, 2026
Girls on the Run 5K at Colfax - Running Buddies and Volunteers
Denver, CO • May 16, 2026
Summit Trail Running Series - B&B Bolt
Frisco, CO • May 17, 2026
Healing Warriors Program 2026 Annual 5K Fun Run
Fort Collins, CO • May 17, 2026
Miles for Smiles 5K
Arvada, CO • May 17, 2026
Denver Colfax Marathon
Denver, CO • May 17, 2026
Canine On the Creek
Dumont, CO • May 17, 2026
Dash & Dine 5k #4 - Series Finale
Boulder, CO • May 19, 2026
AdventHealth Race to Rebuild
Lone Tree, CO • May 20, 2026
Mile High Mile
Boulder, CO • May 23, 2026
Memorial Day Run 5K/10K/13.1 DENVER/AURORA
Centennial, CO • May 23, 2026
Farish Trail Race
Woodland Park, CO • May 23, 2026
Run for Mental Health 5K/10K/13.1 DENVER/AURORA
Centennial, CO • May 23, 2026
GMR Backyard Ultra
Golden, CO • May 23, 2026
The Narrow Gauge Races
Durango, CO • May 24, 2026
The Narrow Gauge Races
Durango, CO • May 24, 2026
Farmstand 50
Pueblo, CO • May 24, 2026