Showing 36 events within 100 km in the next 30 days. Page 1 of 2.
Join us for the Erie Half and 5k!
The Hometown Race Series features half marathons and 5k distance events in outlying communities outside the Denver and Boulder metro areas.
LOOK UP! At the Erie event, we often see the early morning skies with dotted with delightfully colorful hot-air balloons.
Whatever distance you're ready to tackle, we'll be there with you to celebrate at the finish line! This is one of the few 5k events where FINISHER MEDALS are awarded to each participant. Go home with proof of your pride and show off that bling!
Come join us for a race around the entirety of beautiful Lake McIntosh! This 3.5 mile race is a half paved/half dirt course surrounded by wonderful mountain views, vast farmlands, and beautiful aquatic wildlife! Gather at Dawson Neighborhood park near the pirate ship playground where you will find an assortment of vendors, music, games, and fun! All are welcome to participate in this awesome event! Doggos are encouraged to participate!
! NEW ADDITION ! We are so excited to announce the Kids Dash! Please bring your kiddos to enjoy a mad dash to the finish line near the Pirate Ship Playground at Dawson Park!
Thanks for registering for the race! Please see Sanitas Sports website for Gold Rush omnium series event details and schedules for all five races.
Sanitassports.us
Founded in 2011, over 10,000 B Strong Riders have raised over $5 million to fund the B Strong Center for Integrative Care at Boulder Community Health and support other local cancer charities.
Event T-Shirt & Jersey:
[B Strong 2026 T Shirt.jpg] [b48c1cff-0f1d-4a09-b7d4-f1d920d563a8.jpg]
Join us for the annual Summer Sizzler 5k/10k/15k! A fun summer event that is perfect for the whole family.
The fun includes -
Great Swag - designer shirt & custom medal
Chip-timing with live results and awards
Free photos
Delicious Treats waiting at the finish line
FREE Shaved Ice!
Plenty of fun!
Grab your friends and family, you are not going to want to miss this one!
Can't make the race? No problem! We offer a virtual race option where you can run anywhere, at any time, and still earn the fun swag!
*Youth-based pricing for the 5k/10k, 12 & Under are only $17!
5k/10k/15K registration includes a custom bib, designer shirt, and a custom finisher medal!
1 Mile registration is untimed and includes a custom bib, designer shirt, and a custom finisher medal!
The kid's dash is a fun, untimed dash for our kiddos ages 10 and under. Registration includes a mini bib, youth-sized shirt, and a specifically crafted medal for our kids' dash event! (If your child wants to run the kid's dash, and doesn't want the SWAG, they are welcome to run with us on race day for free!)
*Register by midnight on Thursday, two Thursdays before race day, to guarantee your shirt!
🏁🏅Create a team, or join an existing team during registration. Once 4 people have registered on that team, all team members will be refunded $5, once ten people register another $5 will be refunded for a total of $10!
Welcome to the Pioneer Prairie Dog Half Marathon event; the one that started the series! With 10k and 5k events too!
Everyone is back to school and slipping into a routine. Make this your mental health break as you break away from the chaos of weekly schedules and give yourself a morning to race in the crisp autumn air! You'll be glad you took time for YOU!
parkrun is such a simple concept: turn up every Saturday and volunteer, walk, jog or run 5k.
NO Race Day Registrations
Fun for all, from newcomers of any age racing for the first time to veteran competitors looking to test their fitness, all in a friendly, welcoming environment.
Held at the Historic Potts Field, home of the University of Colorado Track & Field Team, the facilities offer the full range of track and field events and is one of the only meets in Colorado that offer a chance to run the Steeplechase or throw the javelin.
If you've been wanting to try a track race and run in the footsteps of CU stars such as Jenny Simpson, Emma Coburn, Joe Klecker, Val Constien, Dathan Ritzenhein, Alan and Shayne Culpepper, and Kara and Adam Goucher, now is your chance!
Event Overview Celebrating its 13th year, the Westminster Trail Races invites runners to experience the thrill of racing around beautiful Standley Lake. This unique course in Westminster, CO, combines packed dirt trails, single-track, and a touch of bike path, creating an exciting yet accessible route for competitive runners, intermediates, and novices alike.As you run around Standley Lake, you’ll be immersed in Colorado’s stunning natural beauty, with shimmering lake reflections and front range mountain views lighting up the blue sky. More than just a race, the Westminster Trail Race is a celebration, complete with music, and a vibrant, festive atmosphere that makes each mile an unforgettable experience.For more information about the race, please visit our Westminster Trail Race Website Information on the website includes: course maps, race day schedule, pacer & crew information, race perks, and more.Race entries are non-refundable and non-transferable. For other options, please check out
our Race Withdrawal Policy. Course Descriptions Set against the beautiful backdrop of Standley Lake, the Westminster Trail Race offers an unforgettable trail running experience that highlights Colorado’s natural beauty. Featuring 100% packed dirt trails each route brings its own unique challenge, elevation gains, and captivating vistas. From the beginner-friendly 6K to the endurance-testing 50K, runners of all levels can embrace the thrill of racing under the bright summer sun, surrounded by lake reflections and front range mountain views that make this trail series truly magical. 50 KM Course The 50K course at Westminster Trail Race offers a thrilling ultra-distance challenge around Standley Lake. This looped journey covers 32 miles entirely on packed dirt trails, with 1712 feet of elevation gain and a steady climb at Mile 1, reaching a peak elevation of 5,597 feet. As you run through the day, three well-placed aid stations keep you fueled, while shimmering lake reflections and front range
mountain silhouettes create an unforgettable backdrop. This course is built for endurance, immersing you in the beauty and excitement of Colorado’s trails. 35 KM CourseThe 36K course at Westminster Trail Race showcases the thrill of running with a scenic route entirely on dirt trails. Covering 22.5 miles with 1162 feet of elevation gain, this looped course features a gentle climb at early in the race and reaches a high point of 5,597 feet. With three aid stations along the way, you’ll be able to pace yourself while taking in Standley Lake’s reflections and the surrounding mountain views under the bright sky. This distance is perfect for runners seeking a rewarding challenge with a festive atmosphere. 18K CourseThe 18k course at Westminster Trail Races provides a balanced mix of challenge and scenic beauty, with 11.2 miles of packed dirt trails in a looped route. With 583 feet of elevation gain and a moderate incline in the early miles, this course reaches a max elevation of 5,597 feet,
offering sweeping views of Standley Lake and the surrounding front range. Three aid stations are available to keep you fueled, making this an ideal distance for runners eager to experience the magic of summer Colorado racing. 12 KM CourseThe 12K course at Westminster Trail Race is a dynamic out-and-back route that winds through 7.7 miles of packed dirt trails. With 464 feet of elevation gain, runners reach a peak elevation of 5,597 feet, where views of the lake and front range mountains come alive under the sparkling sun. Supported by two aid stations, this course offers a manageable yet thrilling challenge for all experience levels. 6 KM Course The 6K course at Westminster Trail Race is an inviting and accessible race on packed dirt trails. Covering 3.7 miles with a gentle 287 feet of elevation gain, this out-and-back route includes a gradual climb at early in the race and reaches a high point of 5,450 feet. With lake reflections and mountain views illuminated by the bright sun, this
course captures the magic of summer running in a shorter, friendly format. Ideal for beginners and seasoned runners alike, the 6K at Westminster Trail Races promises an unforgettable day on the trails. Event Schedule Bib PickupRunners Roost Louisville 459 S. McCaslin BlvdLouisville, CO 80027August 14, 4PM-6PMRace Day Schedule5:30 AM - Race Day Registration and Bib Pickup6:30 AM - 50KM Start7:00 AM - 36KM Start7:30 AM - 18KM Start7:45 AM - 12KM Start8:00 AM - 6KM Start Volunteer We need help to make Westminster Trail Races possible. This is a great way to see your runner on course and help runners get to that finish line! Volunteer perks include Aravaipa race credits and race swag! Sign up to volunteer HERE. Cupless Event As part of our commitment to minimizing our environmental impact, we’re proud to bring our cupless initiative to the Westminster Trail Races. To help reduce waste on the trails, we’ll provide UltrAspire reusable cups available for purchase at registration and on race day—or
feel free to bring your own! Let’s work together to keep our beautiful race environments clean and sustainable for future adventures. Event's current local time: 2:17 AM MT
Eat. Run. Adopt.
Join us for Berthoud’s first-ever community-driven 10k!
In partnership with Berthoud Pet Supply, this isn’t just a race—it’s a moving feast with a mission. A portion of race registration proceeds will go to Scroungy Dogs and Pretty Pups Rescue This community race and expo is designed to support Scroungy Dogs and Pretty Pups Rescue, a local 501(c)(3) non-profit dedicated to rescuing and rehoming dogs and cats throughout Northern Colorado.
Inspired by the spirit of the famous Taco Bell 50k, we are hitting the pavement to celebrate the heart of our town: our local cuisine, and small businesses. Runners will run around town stopping at set up food aid stations with a sample of the local restaurants food. They will wear a wristband that will be hole punched to show they completed eating their samples. They can collect all samples and eat them at the finish but need to hole bunch their wristband to confirm they made the stops.
Prizes for the overall winner are BOLDERBoulder 2027 entrance + cash prize. Runners up in men, women, kids, seniors get a gift basket with local items from local businesses.
August 8, 2026 Come Run, Come All to Dirt Circus Boulder! The Dirt Circus returning to Boulder, Colorado. Dirt Circus is a series of free community events organized by UltraSignup to celebrate local races, and race directors. We are bringing together the local running community to share everything we love about trail running. The one-day festival will highlight local races, run clubs, brands, and other local businesses. The event includes a social run, food, a raffle with tons of prizes, camaraderie, and so much more. Come and join us under the big top.For information on Dirt Circus events in other cities check out dirtcircus.ultrasignup.com + join our online community on Facebook! Local Store Partner This event is possible because of the local partnership of Runners Roost in Boulder. Stop on in for all the running shoes, apparel, and other gear you could need. Dirt Circus Boulder Partners Dirt Circus is a party to bring together the whole running community, not just runners, but also race
companies, coaches, nutritionists, and running brands. See below for some of the partners who will join us in Boulder! Are you a race director, run club, or other local run business that wants to be a part of the event? Fill out this form, we'd love to hear from you.SponsorsRace Companies Onsite VendorsAltra • Asics • Brooks • Buff • Elite Massage • Hoka • Nathan • Neversecond • On • Precision Fuel & Hydration • La Sportiva • Mount to Coast • Salomon • Saucony • Topo Athletic • and more!Run ClubsBlack Men Run + TURF Denver • Coffee Run Club Boulder • Denver Beer Co’s South Downing Run Club • Denver Black Girls Run Club • Roxborough Running Club • and more! Volunteers We LOVE our volunteers - and could use additional help with Runner-Check In, with Leading and Sweeping our group runs, and during the Raffle! If you are interested check out the Volunteer Link and we will make sure you get hooked up with extra swag for your support! And don't worry about missing out, all
volunteers will be included in the run and festivities if interested! Event Details Saturday August 8, 2026We are a CUPLESS event, so please bring your bottles/cups water refills + is supplying electrolytes to keep you hydrated! As much as we love our fur babies, NO DOGS allowed (except service animals) - thanks for understanding!7:00am - Group Run Check-inat: Runners Roost BoulderGive yourself time to check in, mingle, demo shoes, and get ready to run. Participants will receive a sweet UltraSignup branded "Shoe Bag Lite" upon check-in (while supplies last)! And to help ramp up the fun, we are partnering with for our face decorating, glitter station!8:00am-8:30am - Group Run Starts We will send runners out in waves every few minutes! Enjoy a casual 4.5 mile or 10k run with friends from the local run community!9:00-9:30am - Return from Group Run for the FestivitiesEnjoy food, beverages, and the Dirt Circus Expo!10:00am-12:00pm - Raffle, Expo, & Social ConnectionsGet excited for raffle
prizes from brand partners, race entries, and cool swag & apparel! We'll have brand booths and tables set up around when you return from your run, whatever distance you chose. Talk to race directors, learn about local races, mingle with friends, learn about running shoes and apparel products, and maybe test out some hydration and nutrition brands!Preorder Your Original Dirt Circus T-Shirt! Each city on the tour gets its own exclusive design—only available for purchase during registration! Don’t miss out on the Boulder edition, with preorders closing Sunday, July 19, 2026. Plus, explore even more Dirt Circus swag available for purchase at checkout and see more UltraSignup gear via the store link below. Routes What is Dirt Circus? Did you know that there are thousands of small local trail running events across the United States each year? Our goal is to connect runners with races and with one another, to highlight race directors, running stores, coaches, and the other local businesses that
make up the fabric of our trail running community. The best way we know how to do that is by going for a run together. This sport is a little wild and we like it that way, so come join the Dirt Circus with us.Meet with race directors, find your next event, run with friends, win prizes and more. Think of it as a live and in-person version of ultrasignup.com, but even more fun.Why a Circus? Once upon a time, ultrarunning looked a little different. The sport has its roots in pedestrianism, where people would gather under the big top and walk and run for sport. Bets were made, the limits were pushed, and popularity soared. So come entertain yourselves with us, under the metaphorical big top. UltraSignup Store Shop UltraSignup gear and apparel in the UltraSignup Store. Event's current local time: 2:13 AM MT
Founded in 1979, the Eldorado Run for the Cure is the longest operating charitable footrace in the State of Colorado. All proceeds from the annual four-mile run benefit the Colorado Cancer Foundation's life saving work, from funding oncology research at the University of Colorado's (CU) Division of Medical Oncology to aiding patients at the CU Hospital in Aurora, CO.
Each year, the run has developed and grown, and in 2023 a new course was introduced, routing participants along the scenic South Boulder Creek, which winds through the high cliff walls of historic Eldorado Canyon.
As the summer mornings start to cool, join us for a fantastic end-of-season celebration at our 14th annual Runapalooza! From our new venue at Colorado Tap House, you'll have the chance to tackle relatively gentle 5K and 10K courses that go along the acclaimed Ralston Creek Trail, taking you through shady, creekside beaty along Arvada's picturesque open spaces and charming golf course communities. Or our challenging half marathon course that combines the beauty of the Ralston Creek Trail with the challenging Blunn Reservoir loop with its gorgeous Denver and Front Range views. This event, paired with its Endless Series' counterpart Mardi Crawl, offers a can't-miss opportunity to experience the best of what Colorado has to offer!
Join Conservation Colorado for the second annual Rebel Run 5k! Run, walk or stroll to show your passion for Colorado's climate, air, land, water and communities. Create or join a team, or go solo – every dollar you donate or raise supports Conservation Colorado's efforts to protect the beautiful state we love and the communities who call it home. After the race, celebrate at our finish line party with food, drinks, sponsor booths and more. Sign up today to become a rebel and move for the cause! Stay tuned for registration opening.
Miles for Migraine will host its 6th annual 2-mile Walk, 5K Run and Relax Denver Event at Great Lawn Park. This event is a fundraiser for Migraine & Headache Awareness, Treatment & Research. Dress up in your best purple flair for a chance at a fun prize!
All funds raised will benefit the University of Colorado Headache Center and Children's Colorado Headache Center to support local migraine research and fellowship training programs.
Registration: https://den.milesformigraine.org
Registration has moved to den.milesformigraine.org
Miles for Migraine will host its 7th annual 2-mile Walk, 5K Run and Relax Colorado event on Saturday August 15th at Great Lawn Park in Denver. This event is a fundraiser for Migraine & Headache Awareness, Treatment & Research. It's more than a walk/run - come connect with your local migraine & headache community, listen to our speakers & visit sponsors in the festival area.
The 5K run is professionally timed. The Walk and the Relax events are free, but donations are encouraged. All walk and run finishers receive a finisher medal.
Dress up in your best purple flair for a chance at a fun prize!
Funds raised will benefit Miles for Migraine free programs & services as well as the University of Colorado Headache Center and Children's Colorado Headache Center to support local migraine research and fellowship training programs.
Come join in the celebration of the resurgence of a great community event. The Ram Run will be returning to it's traditional month. This fun and exciting event will include a 5k around the neighborhoods near Green Mountain High School. Proceeds will help benefit the Green Mountain High School Cross Country Team. The first 150 registrants will be guaranteed a t-shirt. Overall and age group awards will be given as well.
Awards
Top 3 Male
Top 3 Female
1st place in each age category: 0-9, 10-19, 20-29, 30-39, 40-49, 50-59, 60-69, 70+
The elementary school in the Green Mountain Articulation Area will get a traveling trophy.
Eligible Elementary Schools:
Foothills Elementary, Rooney Ranch, Hutchinson Elementary School, Devinny Elementary
The Rocky Mountain Lobo Invitational features seven races on a true cross country course in beautiful Spring Canyon Park.
Our high school 5k features grass and dirt trails with minimal sidewalk crossings. Course Map.
The community 5k covers the same course as the high school races. Perfect for runners looking to spike up for a unique cross-country experience!
The Lobo Invitational also offers a low-key, 1.5 mile race opportunity for middle school runners looking to get their feet wet before their school season starts.
The Lobo Invitational is great for spectating and for coaches taking splits. Please join us for this festive, fun event! All proceeds from this event support Rocky Mountain High School Cross Country!