Wed, Sep 2, 2026
📍 Denver
Get ready to join the excitement as this beloved relay event returns for its fourth year on September 2nd in Denver's beautiful Wash Park! Gather three running buddies (with at least one woman on your squad) to form a 4-person relay team, where each runner will tackle roughly a mile around scenic Smith Lake starting and finishing at the Boat House. Teams can register as Sponsored ($160, with limited slots on a first-come basis), Open/Community, or Elite ($100 each), though Sponsored team rosters must be completely filled by August 5th to secure team gear.
Sat, Sep 5, 2026
📍 Pueblo
Join this inclusive event in Pueblo, CO that welcomes walkers, runners, and wheelchair users to celebrate accessibility, resilience, and community. Born from one runner's journey back to running after a serious spinal injury, this race has grown from a personal goal into a gathering of 500+ participants who come together to support each other. Whether you're looking for a meaningful race experience or simply want to be part of an inspiring community event, this is your chance to be part of something bigger than yourself.
Sat, Sep 5, 2026
📍 Keystone
Get ready to tackle a 9.4-mile mountain running challenge at Arapahoe Basin with 2,211 feet of elevation gain as part of the Cirque Series in Keystone, CO. Compete in Sport, Expert, or Pro categories with prizes awarded after each race and for overall series winners—Pro athletes can earn up to $1,000 cash per race, while Expert and Sport competitors win gear prizes ranging from $100-$400. Special recognition awards celebrate the youngest competitor, oldest competitor, race MVP, and middle-of-the-pack finisher, and with a 600-runner cap, early registration is recommended.
Sat, Sep 5, 2026
📍 Arvada
Head to the NAAC in Arvada for this community-friendly running event that welcomes both runners and walkers on its new dirt course! You're invited to arrive early and cheer on the high school racers (starting at 8:15am) before lacing up for your own Demon Dash experience at this exciting new location.
Sat, Sep 5, 2026
📍 Westminster
Get ready for a family-friendly running celebration in Westminster, CO, featuring half marathon, 10k, 5k, and 1-mile options along with a kids' dash for ages 10 and under. Every participant receives a custom bib, designer shirt, and finisher medal, plus you'll enjoy perks like chip timing with live results, half marathon pacers, free photos, and tasty treats at the finish line. Best of all, kids 12 and under can register for the 5k/10k for just $17!
Sun, Sep 6, 2026
📍 Colorado Springs
Get ready for a fantastic community running celebration featuring half marathon, 10k, 5k, and 1-mile options, plus a kids' dash for the little ones! Every participant enjoys perks like custom bibs, designer shirts, finisher medals, chip timing with live results, pacers for the half marathon, free photos, and tasty refreshments at the finish line. Youth pricing makes it super affordable—kids 12 and under can register for the 5k/10k for just $17!
Sun, Sep 6, 2026
📍 Steamboat Springs
Start your adventure at 10,000 feet on Rabbit Ears Pass summit and experience one of Colorado's most acclaimed 10k trail races, featuring stunning mountain views and challenging terrain. You'll tackle roughly 1,200 feet of elevation gain and loss as you climb uphill on dirt roads and two-track before descending on scenic single-track trails (note: the actual distance is 6.8 miles). With just one aid station at the 3.4-mile mark, it's smart to bring your own water to stay hydrated throughout this rewarding run.
Mon, Sep 7, 2026
📍 Loveland
Join runners from Northern Colorado for a faith-based celebration of inclusion and athletic opportunity at this Labor Day 5K in Loveland! The event raises awareness and funds to support sports programs for people of all abilities, including athletes, coaches, equipment, and facilities. Registration opens at 8am with the 5K and Run A Thon starting at 9am at Mehaffey Park's South Entrance.
Mon, Sep 7, 2026
📍 Loveland
Gather with Northern Colorado's all-abilities community for a faith-centered 5K celebration on Labor Day in Loveland! This FCA All-Abilities event brings runners together to support inclusive sports programs for every age, raise awareness about opportunities for athletes of all abilities, and fund essential resources like coaching, equipment, and facilities. Whether you're running to champion unity, community inclusion, or to support athletes with different abilities, you'll be part of something meaningful that combines faith, fitness, and fellowship.
Thu, Sep 10, 2026
📍 Greeley
Get ready to make a difference on Saturday, September 19, 2026, at Greeley's Family FunPlex for this year's Superhero Run—where you can dress up and choose your distance: 10K, 5K, 1 Mile, or a virtual option (September 19–27). Your participation directly supports Life Stories Child & Family Advocacy's mission to protect abused children and prevent abuse in our community. With races kicking off at 8:30 am and a kids run at 9:45 am, it's a fun morning celebration that brings real impact to local families!
Fri, Sep 11, 2026
📍 Idaho Springs
Get ready to experience Colorado's most spectacular season on foot! This 165-mile relay adventure starts in Idaho Springs and winds through three challenging mountain passes before finishing in Buena Vista, combining the best of classic routes with fresh scenic challenges. You'll tackle roads and trails while soaking in the crisp fall air and stunning autumn colors that make the Rocky Mountains truly unforgettable.
Sat, Sep 12, 2026
📍 Bellvue
Get ready to explore the stunning perimeter of Lory State Park near Fort Collins, where you'll tackle a challenging mix of terrain including a rewarding climb to 7,000 feet on the west ridge, rewarded with incredible panoramic views of Horsetooth Reservoir, the Great Plains, and the majestic Rocky Mountains. After conquering nearly 1,500 feet of elevation gain in the first four miles, you'll enjoy a thrilling descent followed by rolling singletrack to bring you home. This runnable but technical course delivers the perfect blend of mountain scenery and trail adventure!
Sat, Sep 12, 2026
📍 Greeley
Lace up for this awesome community gathering in Greeley that brings neighbors together while making a real difference for families across Weld County! Whether you're a speedy runner, leisurely walker, or pushing a stroller with the whole family, everyone's invited to participate at their own pace. Every registration fee goes directly to support local organizations, and the first 12 finishers in each category get a sweet gift basket packed with coupons from nearby businesses!
Sat, Sep 12, 2026
📍 Ault
Get ready to lace up on Saturday, September 12th at 8:00 am in Ault for this awesome community event that supports Highland High School's cross-country teams! You'll run or walk 5k right at Highland HS (210 W. First St) on their track, with parking available in the dirt lot behind the school—just $25 gets you in plus a free t-shirt. Stick around for awards given to top finishers overall, masters runners 40+, and winners in 10-year age brackets, with both male and female categories recognized!
Sat, Sep 12, 2026
📍 Durango
Get ready to experience the stunning scenery of Durango, Colorado at this exciting multi-distance event held at picturesque Lake Nighthorse! You'll kick off with a refreshing swim in the pristine lake, then tackle a bike course with some serious elevation challenges before finishing with a scenic run across rolling dirt and gravel trails that showcase amazing lake views. Whether you choose the Sprint distance or double down with the Olympic option, you're in for an unforgettable day of racing!
Sat, Sep 12, 2026
📍 Telluride
Get ready for one of the toughest mountain challenges around—this legendary high-altitude run in Telluride demands serious training and preparation! Spots are super limited with only 1550 slots available, so mark your calendar for June 1st at 6am MDT when registration opens, because these typically disappear fast. Just a heads up: once you're in, you're committed—there are no transfers, refunds, or exceptions, so make sure you're truly ready before you click that register button!
Sat, Sep 12, 2026
📍 Littleton
Lace up and join us in Littleton on September 12th for a fantastic 5k that makes a real difference! Your participation supports the National Federation of the Blind of Colorado and Colorado Center for the Blind by funding Braille literacy programs, blindness skills training, scholarships, and summer camps for blind youth. Run the scenic out-and-back course to Reynolds Landing while helping shift misconceptions about blindness and championing the importance of awareness and acceptance.
Sun, Sep 13, 2026
📍 Boulder
Get ready to pedal through Boulder on Sunday, September 13, 2026, with nine different riding options that'll match your skill level and adventure style! Whether you're chasing challenging mountain climbs on asphalt or gravel, cruising scenic mid-distance routes, or introducing your family to cycling on protected paths, there's something perfect for you. The best part? If you're tackling one of the Epic courses, you'll have the rare treat of riding through the gorgeous Boulder Canyon without any car traffic from 7–9 a.m.—a cyclist's dream day!
Sun, Sep 13, 2026
📍 Bellvue
Grab your running crew and head to Lory State Park's Timber Trailhead on Sunday, September 13th at 7:30am for a laid-back trail run with friends, followed by bagels and coffee to refuel! Whether you're cruising the scenic valley flats or tackling the hillier options, all paces are welcome for this inclusive morning adventure (just remember to bring your State Park Pass and park in the first lot on the right—or at the visitor's center if needed). It's the perfect recipe for a fun Sunday: good company, beautiful trails, and tasty treats!
Sun, Sep 13, 2026
📍 Denver
This spring running program in Denver welcomes kids from Pre-K through 8th grade for a five-week series featuring age-appropriate distances ranging from 50-yard sprints to one-mile runs. Your registration covers all five weeks of racing, plus weekly race bibs, a runner shirt, a finisher medal, and sponsor giveaways, with a makeup race option on 5/24/2026. The program also includes a Challenger Division with an adaptive 75-yard race where kids with disabilities and special needs can participate with supporter runners alongside them, and every child earns a medal at the end with trophies going to top finishers in their age and gender categories.
Sun, Sep 13, 2026
📍 Fort Collins
This five-week spring series welcomes kids from Pre-K through 8th grade to participate in Fort Collins, with weekly races offering distances tailored to each age group, ranging from 50-yard sprints to one-mile runs. Your registration includes all five weeks plus race day perks like bibs, a runner shirt, a finisher medal, and sponsor giveaways, with a special Challenger Division featuring a 75-yard adaptive race where supporters can join young runners with disabilities or special needs. Every participant receives a medal at the end of week five, top finishers in each grade earn trophies, and you have the option to sign up for individual races on race day if you prefer.
Sun, Sep 13, 2026
📍 USAF Academy
Want to crush a personal record? This one-mile race at the United States Air Force Academy in Colorado descends over 220 feet down Academy Drive—a smooth, fully paved route that's built for speed. You'll race from near Doolittle Hall toward Falcon Stadium on August 16, 2026, enjoying live music, post-race snacks, real falcons, and stunning views while friends and family cheer you on.
Sun, Sep 13, 2026
📍 Loveland
Lace up and see how many times you can conquer a 1-mile loop in 90 minutes at this exciting event in Loveland, CO—compete for the most loops, fastest time, or just have a blast pushing yourself! We've got something for everyone, including a Mini Honey Bee Hustle for kids 10 and under with their own 30-minute challenge, plus the whole Honey Festival experience with live music, the Farmer's Market, and tons of activities happening all morning long. Come celebrate with us and discover what you're capable of!
Sun, Sep 13, 2026
📍 Palmer Lake
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Lace up on Saturday, September 13, 2026, at Palmer Lake Regional Recreation Area for a meaningful 8th annual tribute that honors over 450 Colorado service members lost since the Global War on Terror began. This low-pressure, chip-free event lets you move at your own pace for up to 6 hours—whether that's 1 mile or the full distance—as each mile celebrates an individual hero with their name, rank, and story shared aloud. Come as you are, run, walk, or ruck, and know that your participation is a powerful way to remember those who gave everything.
Sun, Sep 13, 2026
📍 Denver
Join folks of every age and fitness level for a meaningful 5K that celebrates the courage of 9/11 heroes and honors those who've served our country. This community-focused event brings together veterans, active duty service members, first responders, and families of the fallen while offering special rucking divisions (where you'll walk or run with a weighted pack like special forces do) – and everyone in the GORUCK division gets an exclusive patch! It's a chance to move together, support each other, and pay tribute to those who've made a difference.
Sun, Sep 13, 2026
📍 Denver
Join us Sunday, September 13, 2026 at 9am in Denver for a celebration that's been going strong since 1994—lace up for the 31st El Grito 5k at MSU Denver's Auraria Parkway campus! This beloved community run/walk honors Mexican Independence Day while supporting student track and field athletes, bringing neighbors together for fitness, fun, and cultural pride. Whether you're walking, running, or bringing the kids along, you'll enjoy great perks like a signature Tarahumara shirt, race bib, a tasty burrito, and a refreshing beverage (just register by September 4 for $30, or $20 for students).
Sun, Sep 13, 2026
📍 U S A F Academy
Get ready for an exciting inaugural triathlon hosted by the U.S. Air Force Academy's passionate Triathlon Club right here in Colorado! You'll tackle a super sprint distance with a 300m swim in the pool, followed by a 5k bike and 2k run across the beautiful Academy campus—with collegiate competitors racing through prelims, semis, and finals, while age groupers enjoy a rolling start format. Best part? Every dollar raised goes straight back to supporting the USAFA Triathlon Club's racing program!
Thu, Sep 17, 2026
📍 Colorado Springs
Get ready to celebrate finishing an amazing 2026 season with your running crew in full toga glory! You'll enjoy great company, tasty snacks, drinks, live music, and exciting raffles at the Venue at Red Rocks Barn on Thursday, September 17th from 6-9pm. This members-only bash is your chance to show off your creative costume skills and wrap up the year with plenty of fun and festivities!
Sat, Sep 19, 2026
📍 Frederick
Get ready to push your limits across eight challenging fitness zones in Frederick, CO—whether you're looking to mix running with your strength work, skip the miles entirely, or go all-in with doubled reps and intensity. You can tackle this solo or team up with a partner, dividing the work however you see fit. Pick your adventure: the classic Cerox with running incorporated, Iron without the miles, or Iron X for those who want to double down on the grind.
Sat, Sep 19, 2026
📍 Brighton
Join us in Brighton, CO for this meaningful 5K that honors Deputy Heath Gumm, a dedicated Adams County Sheriff's Office member who made the ultimate sacrifice on January 24, 2018. Whether you're a runner, walker, or supporter of law enforcement, this is a great opportunity to come together as a community and celebrate Deputy Gumm's legacy and the lives he touched. Registration is easy with options for everyone—just $30 for teens and adults or $10 for kids under 12, with guaranteed race shirts for early sign-ups by September 6, 2026!
Sat, Sep 19, 2026
📍 Denver
Get ready to celebrate autism acceptance and community spirit at this inclusive gathering in Denver where runners of all abilities are totally welcome! Choose your own adventure with either a full 5K or a leisurely 1-mile paved route, bring whatever adaptive gear works for you, and enjoy the resource fair featuring food, activities, and local support services. Plus, you could snag awesome prizes like VIP tent access, custom winners' hats, and exclusive character meet-and-greets if you become a top fundraiser!
Sat, Sep 19, 2026
📍 Beulah
**Currently paused due to the Aspen Acres Fire.** Get ready to explore Beulah's stunning mountain landscape with three distance options: cruise around scenic gravel and paved roads for the 5K and 10K, or tackle beautiful hiking trails through Beulah Valley and Pueblo Mountain Park on the half-marathon route. Runners of all ages and abilities are welcome, with a 3.5-hour time limit for the half-marathon and special pricing of just $15 for participants 17 and under doing the shorter distances—plus you can chain together the Beulah Challenge with other local races to complete the Over It SOCO Series!
Sat, Sep 19, 2026
📍 Deckers
Come out to Deckers, CO on September 19th, 2026 for this fun-filled adventure race that supports an amazing cause—helping send children to YMCA Camp Shady Brook! As you tackle the course, you'll be making a real difference in kids' lives while enjoying your own outdoor adventure. It's the 9th year of this beloved event, so lace up your shoes and join the community for a day of racing with purpose!
Sat, Sep 19, 2026
📍 Buena Vista
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Sat, Sep 19, 2026
📍 Westminster
Get ready to explore one of the state's best-loved trails while soaking in stunning views of Standley Lake and the iconic Flatirons at this beloved 9th-year celebration in Westminster! Your run will take you on a scenic journey southwest along Big Dry Creek Trail, where Colorado's natural beauty really shines. If you're looking for a September warm-up event, check out the companion race, Beat the Heat!
Sat, Sep 19, 2026
📍 Pagosa Springs
Get ready for a vibrant family-friendly 5K through scenic, mostly flat terrain in Pagosa Springs where you'll get splashed with color at multiple stations along the way—no timing pressure, just pure fun! Whether you're running, walking, or pushing a stroller, everyone's welcome to participate, and you can earn awards by showing up in creative costumes. Registration is available right up until race day on September 20th (cash only for day-of sign-ups), with early packet pickup on Friday the 19th at PS FroYo, and all proceeds benefit the nonprofit Aspen House & Aspen Services.
Sat, Sep 19, 2026
📍 Denver
Get ready to celebrate community spirit while hitting the pavement at this beloved Denver gathering, where runners and walkers of all abilities come together for fitness, fun, and neighborhood connection. Whether you're chasing a personal record or enjoying a comfortable stroll, you'll love the welcoming atmosphere and the chance to stick around afterward for free entertainment, food truck dining (with a complimentary ticket included!), and prizes for our speediest participants. It's the perfect way to stay active, meet great people, and be part of what makes the Montbello neighborhood thrive!
Sat, Sep 19, 2026
📍 Commerce City
Join us for a fun 5K run or walk in Commerce City, CO that makes a real difference! All proceeds go directly to Every Child Pediatrics' vital work ensuring every child gets the healthcare they need, no matter their background or financial situation. Lace up your shoes knowing you're running for a cause that truly matters!
Sun, Sep 20, 2026
📍 Golden
Get ready to hit the trails in Golden, Colorado for a special milestone celebration—this beloved running event is turning 20 and hosting its shindig on September 20, 2026! You'll cruise through downtown's charming scenery, dash under the famous Golden "Welcome" arch, and choose between a 5K or 10K route that starts and finishes at Golden High School. Come be part of two decades of community spirit and create your own golden memories on the course!
Sun, Sep 20, 2026
📍 Wheat Ridge
Since 1981, this beloved Colorado institution has been gathering running enthusiasts of all levels at Wheat Ridge High School to pound the pavement through local neighborhoods while supporting school programs. Whether you're a serious competitor or just out for a fun weekend jog, you'll love the community spirit as you start and finish right at the school before taking a scenic loop through the surrounding area. Best of all, every penny from entry fees goes directly to educational and special programs, and there's a Fun Run option for everyone!
Sun, Sep 20, 2026
📍 Fort Collins
Head to Fort Collins for an unforgettable autumn adventure featuring two fantastic distance options—a celebrated half marathon and a speedy 5-miler—both showcasing the stunning Poudre River Canyon on a thrilling downhill course. You'll cruise through Colorado's only Wild & Scenic River valley starting at the iconic Mishawaka Amphitheater, then celebrate your finish at an epic party complete with live music and cold beer in a beautiful field. Bring your crew and experience what many consider one of Colorado's premier races, whether you're chasing a personal record, tackling your first half marathon, or simply soaking in the fall scenery!
Sun, Sep 20, 2026
📍 Pueblo
Join Southern Colorado Runners for a fun morning of racing on Sunday, September 20, 2026 at 8AM, where you'll get to be part of the exciting finale of Pueblo's Chile & Frijoles Festival—complete with live music, food vendors, cooking competitions, and of course, plenty of delicious chiles! You can choose between a 5K or 10K that showcases the scenic Arkansas River Trail and Riverwalk, starting and finishing right at Walter's Brewing Company in beautiful downtown Pueblo. Best part? SoCo and PPRR club members save $5 on registration!
Sun, Sep 20, 2026
📍 CARBONDALE
Join True Nature for a laid-back morning celebration on September 20th at 8:00am in beautiful Carbondale, where you can run, walk, or stroll with friends and family along the scenic Rio Grande Trail. All fitness levels are welcome at this community-focused event that starts and finishes at the True Nature Peace Garden, with proceeds supporting the Connection is the Medicine Foundation. Whether you're seeking a casual way to move your body, connect with neighbors, or experience True Nature's welcoming campus, this inaugural 5K promises to be the start of a meaningful annual tradition for our community.
Sun, Sep 20, 2026
📍 Aurora
Get ready to tackle some fun cross country action in Aurora with distances ranging from 1k all the way up to 5k for runners of all ages! You'll be cruising mostly on grass terrain that's pretty level overall—though expect a few bumps, a little creek to splash through, and some bale jumps to keep things exciting. The longer races smartly use loop courses, so you'll knock out a 1k warm-up lap before tackling the 2k loop(s) for your remaining distance.
Wed, Sep 23, 2026
📍 Winter Park
# Elevation Everest
Join us for an unforgettable mountain weekend in Winter Park where you'll get expert guidance, connect with an awesome community, and tackle some serious elevation—all while having full support every step of the way. Choose the package that works best for you: go all-in with meals, swag, training plans, and logistics handled, or customize your experience based on what you need. No matter which option you pick, you'll have our leadership team right there with you to make sure your mountain adventure is incredible.
Fri, Sep 25, 2026
📍 Colorado Springs
Lace up your skates and glide through an unforgettable night in Colorado Springs on Friday, September 25, 2026, where you'll roll around the Chick-fil-A Garden of the Gods parking lot with music, lights, and costumes while supporting Angels of America's Fallen. The first 200 participants who register get to skate for FREE Chick-fil-A for an entire year—whether you're on roller skates, skateboards, blades, scooters, or even unicycles! Grab your crew, register as a team or go solo, and get ready to have a blast with emcee Randy Watson and fellow skaters, with rental skates available for just $10 if you need them.
Fri, Sep 25, 2026
📍 Dolores
# Boggy Draw Bear Chase
Head to Dolores, CO and hit the trails at this fun community race! To get there, turn onto 11th Street from Highway 145 (near Basecamp gas station) and make your way up Dunlap Hill, then turn right on Road W—you'll find parking at the Boggy Draw Trailhead or along the road, with registration and the starting line about three-quarters of a mile up Boggy Draw Road. Arrive early (by 8:30am if you're parking as a spectator) and reach out to race directors Angie Lowe or Lucas Werner if you have questions!
Sat, Sep 26, 2026
📍 Estes Park
Get ready for an epic comeback! After being away for six years, this September 26-27, 2026 event is bringing back serious mountain adventures to Estes Park with three awesome options: a grueling 50k bike race over technical terrain, a scenic 50k trail run through Colorado's wild backcountry (perfect for first-time ultra runners with comfortable cutoff times), and a Heavy Half Marathon for those wanting a tough but slightly shorter challenge—all set against the stunning backdrop of Rocky Mountain National Park. Whether you're a seasoned endurance athlete or ready to test your limits on the trails, you'll find your perfect distance here.