August 2026 races in Denver–Boulder

There are 32 running events listed in Denver–Boulder for August 2026 — 31 5K, 11 10K, 10 Half Marathon, 2 Marathon, 1 Trail Run — starting with 12th Annual Run for the Ring on Sat, Aug 1, 2026. Every listing shows the date, venue, and distances, with a direct link to registration.

• Sat, Aug 1, 2026 12th Annual Run for the Ring Barbara Davis Center for Diabetes at the CU Anschutz Medical Campus · Aurora, CO · From $15 5K Road
• Sat, Aug 1, 2026 Move with MADD Denver 5K Sloan's Lake Park, Denver, CO · From $15 5K Road
• Sat, Aug 1, 2026 Unicorn 5k (South) 9651 S Quebec St · Highlands Ranch, CO · From $13 5K Road
• Sun, Aug 2, 2026 Bound for Boston Marathon & Half Marathon - Denver Northfield High School · Denver, CO · From $45 5K10KHalf MarathonMarathon Road
• Sat, Aug 8, 2026 RMRR August 5km and picnic 6315 S University Blvd · Centennial, CO · From $10 5K Road
• Sat, Aug 8, 2026 All-Out Runapalooza 14982 W 69th Ave · Arvada, CO · From $35 5K10KHalf Marathon Road
• Sat, Aug 8, 2026 Summer Sizzler- Denver Carpenter Park/Thornton Recreation Center Park · From $17 5K10K Road
• Sat, Aug 8, 2026 Arapahoe Warrior 5K 2201 E Dry Creek Road · Centennial, CO · From $25 5K Road
• Sat, Aug 8, 2026 Eat. Run. Adopt. 10K 375 Meadowlark Dr · Berthoud, CO · From $40 10K Road
• Sun, Aug 9, 2026 Pancake Stampede 5K 6115 S Santa Fe Drive · Littleton, CO · From $20 5K Road
• Sun, Aug 9, 2026 The Bullfrog Summer Surge 600 South Kipling Parkway · Lakewood, CO · From $10 5K Road
• Sat, Aug 15, 2026 Bagel Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
• Sat, Aug 15, 2026 Run for PB& J 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
• Sat, Aug 15, 2026 Frontier Academy Community 5K 6530 W. 16th Street · Greeley, CO · From $25 5K Road
• Sat, Aug 15, 2026 Sunrise Stampede Fall River Elementary School / Stephen Day Park · Longmont, CO · From $10 5K Road
• Sat, Aug 15, 2026 Miles for Migraine Colorado 101 N Yosemite Street · Denver, CO · From $10 5K Road
• Sun, Aug 16, 2026 Erie Half & 5k Reliance Park · Erie, CO · From $30 5KHalf Marathon Road
• Sun, Aug 16, 2026 Cancer League of Colorado Race 4 Research Washington Park · Denver, CO · From $40 5K Road
• Sat, Aug 22, 2026 Staunton Rocks! Marathon and Half Marathon 12102 S Elk Creek Rd · Pine, CO · From $90 5K10KHalf MarathonMarathon Road
• Sat, Aug 22, 2026 2026 True Impact Ministries 5K/10K 6395 S Clarkson St · Centennial, CO · From $39 5K10K Road
• Sat, Aug 22, 2026 Byers Peak Stampede Half Marathon & 5K Run 1741 Co Hwy 73 · Fraser, CO · From $45 5KHalf Marathon Road
• Sat, Aug 22, 2026 Coyote Chase 5k 329 Campus Dr. · Louisville, CO · From $30 5K Road
• Sat, Aug 22, 2026 Ram Run 13175 W Green Mountain Dr · Denver, CO · From $10 5K Road
• Sat, Aug 22, 2026 Jog in the Bog 5k 3645 W 112th ave · Westminster, CO · From $45 5K Road
• Sun, Aug 23, 2026 Pioneer Prairie Dog Half, 10k & 5k 10600 Westminster Blvd · From $25 5K10KHalf Marathon Road
• Sun, Aug 23, 2026 Rebel Run 5k Great Lawn Park · Denver, CO · From $20 5K Road
• Sat, Aug 29, 2026 Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
• Sat, Aug 29, 2026 Sloth Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
• Sat, Aug 29, 2026 RexRun For PAWSitivity 2026 Trail Run/Walk Arapahoe County Fairgrounds · Aurora, CO · From $20 5KTrail Run Trail
• Sat, Aug 29, 2026 Historic Elizabeth Main Street 5K & Family Color Run Main Street · Elizabeth, CO · From $10 5K Road
• Sat, Aug 29, 2026 Run Like the Wind 5k / 2k / Dog Jog 14863 CO Hwy 7 · Allenspark, CO · From $20 5K Road
• Sun, Aug 30, 2026 Glow & Roll: Illuminate What's Possible 7306 W Bowles Ave · Littleton, CO · From $55 5K Road

Quick answers

How many races are there in Denver–Boulder in August 2026?

32 running events are listed in Denver–Boulder for August 2026, from 12th Annual Run for the Ring on Sat, Aug 1, 2026 to Glow & Roll: Illuminate What's Possible on Sun, Aug 30, 2026. Every listing links directly to registration.

What distances can I race in Denver–Boulder in August?

The August 2026 calendar in Denver–Boulder includes 31 5K, 11 10K, 10 Half Marathon, 2 Marathon, 1 Trail Run.

What is the first race of August 2026 in Denver–Boulder?

12th Annual Run for the Ring on Sat, Aug 1, 2026 at Barbara Davis Center for Diabetes at the CU Anschutz Medical Campus.