Showing 155 events within 100 km in the next 365 days. Page 2 of 8.
Join us for the annual Candy Cane Course 5k/10k/15k! A fun, Christmas-themed 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
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 $22!
5k/10k/15k registration includes a custom bib, designer shirt, and an awesome finisher medal!
1 Mile registration is untimed and includes a custom bib, designer shirt, and an awesome 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!
The Night Nation Run is the World’s first Running Music Festival the ultimate blend of a Music Festival and a Fun Run. Experience a music filled course with Live DJs, Bubble Zones, Light Shows, Neon and Black Lights! Cross the finish line into an Epic Main Stage After Party featuring Top Headliner DJs!
To date, over 2 MILLION people across the World have become a member of the Night Nation™!
The Night Nation Run is proud to support Stand Up To Cancer (SU2C) as their official charity. Stand Up To Cancer (SU2C) is a groundbreaking initiative created to accelerate innovative cancer research that will get new therapies to patients quickly and save lives now.
Celebrate Life. Celebrate friends and family. Celebrate Music. Run with the Night Nation™!
REGISTRATION INCLUDES:
Night Nation T-shirt (Premium & VIP Registration)
Race Bib
Glow Necklace
Free Giveaways
Pre and Post Race Concerts
Admission into the Night Nation after party
The best night of your life!
Rocky Mountain Road Runners holds a monthly Trophy Series in the Denver area. We provide a low-key, low-cost racing environment. Everyone is welcome to run with us!
The 10km race uses a handicap start system, slow-to-fast, spread over ~30 minutes. This gives everyone a chance to win. We'll use your estimated finish time to assign you a start time with others the same speed.
All 5k racers will start ~15min after the first 10km starters.
Race Day Details
Time: 10k starts at 8:00 am + your handicap.*
5k starts approximately 15min after the first 10k starter.
Show up 30 minutes early to get your tag and warm up.
Location: Riverdale Ballfields, 9830 Riverdale Road, Thornton, Colorado, 80229
Course: Both distances are out-and-back on a mix of paved and smooth gravel.
Parking: Plenty of parking at the park.
One of Colorado's favorite trails meets one of its most glorious parks at our 9th annual Fallfest! As courses wind southwest along Big Dry Creek Trail, the remarkable sight of Standley Lake with the Flatirons on the horizon will come into view. Its Endless Series sidekick in September is Beat the Heat.
Ho-ho-hit the trail this holiday season at the 15th Annual Fa La La 5K, 10K & half marathon! This festive run/walk benefits A Precious Child and takes you on a scenic journey along the Big Dry Creek Trail with amazing Front Range views. Bring your furry friends (they'll love the soft surfaces!), your holiday spirit, and a gift donation. Don't miss our summer Dog Days event for another tail-wagging good time and to track your fitness progress in our endless series challenge!
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!
1st Annual Race to the Shield Homecoming Fun Run!
Lace up your running shoes and join us for the 1st Annual Race to the Shield Homecoming Fun Run! Whether you are running, walking, or cheering from the sidelines, every step helps make a difference.
This exciting community event is more than ust a fun run - it's an opportunity to support the sport you're most passionate about. Each participant selects the athletic program they want to support during registration, and 100% of their registration entry direclty benefits that sport.
Bring your family, friends, teammates, and neighbors for a morning filled with school spirit, friendly competition, and community pride! Whether you're racing for a personal best or simply enjoying the fun, you'll be helping strengthen our athletic programs one mile at a time.
Run for fun. Run for your team. Race to the Shield!
We can't wait to see you at the starting line as we kick off Homecoming week with an event that brings our community together while supporting the future of our student-athletes.
Event details and schedule
8:00 a.m. Day of Registration and Packet Pick-up
9:00 a.m. Race starts
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
Join us for the Elevations Credit Union Buffalo Bicycle Classic on Sunday, September 13, 2026! Choose from nine unique ride options designed for every type of cyclist. Our road courses range from moderate rolling routes to the challenging Epic climbs. For dirt‑lovers, our gravel courses offer everything from long, demanding mountain gravel to scenic mid‑distance routes. And for families and newer riders, the Little Buff provides a fun, easy ride on car‑free bike paths.
Ride Boulder Canyon on one of the Epic courses: If you’re riding the Epic, Epic 75, or starting the Gravel Epic, you’ll experience something truly special: westbound Boulder Canyon will be closed to vehicle traffic from 7–9 a.m. This is the one day all year when cyclists can enjoy this stunning canyon completely car‑free—an unforgettable perk reserved just for Buffalo Bicycle Classic riders.
Help Us Fund the Future: The Buffalo Bicycle Classic is more than a ride—it’s a fundraising event dedicated to supporting Colorado students through the BBC Scholarship Fund. This year marks our 24th anniversary, and our mission remains clear: help high‑achieving, high‑need students access a CU Boulder education.
Your registration supports scholarships—but you can make an even bigger impact by raising funds for BBC scholarships. As a part of ride registration, you have the option to become a fundraiser and collect awesome swag along the way. We will create a custom page and you can invite friends and family to contribute, and help open doors for more students. Every contribution fuels opportunity. Since 2003, the Buffalo Bicycle Classic has raised $4.3 million, helping 450+ students pursue their degrees. Your support ensures these scholars can focus on their education—not their tuition bills. Every registration counts. Every fundraiser amplifies the mission. Every dollar changes lives.
RIDE BIKES. CHANGE LIVES.
Join us for the annual Turkey Trails 5k/10k/Half Marathon! A fun, Thanksgiving-themed 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
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!
Half Marathon registration includes a custom bib, designer shirt, and an awesome finisher medal!
5k/10k registration includes a custom bib, designer shirt, and an awesome finisher medal!
1 Mile registration is untimed and includes a custom bib, designer shirt, and an awesome 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!
Voted Best of the Best in Arvada for Non Profit Events by Colorado Community Media! Join the Apex Foundation for the 6th Anniversary Trick or Trot 5K, presented by Intermountain Health! Runners and walkers of all ages and abilities are all welcome to join us for this Halloween celebration. Dress in your Halloween best for a chance to win prizes for the costume contest. Contest categories include Best 12 & Under, Best Couple, Best Group, Best Homemade, and Best Pet costumes.
There will be a separate 1-mile Trick or Trot Candy Hunt for kids 12 & under. Kids can grab candy at our designated trick or trot stations along the 1-mile course. Participants will need to register for this event specifically, as it is separate from the 5K race. Kids registered in the 5k race receive automatic entry to Halloween Hunt. One parent/guardian is encouraged to join but does not need to register. Course giveaways will be available for registered participants only.
Registered 5K participants will receive an event giveaway item, swag bag, and a chance to win great prizes!
Proceeds from this event benefit the Apex Foundation, a non-profit 501(c)3 organization whose purpose is to support Apex Park and Recreation District’s efforts to deliver quality community recreation. https://foundation.apexprd.org/who-we-are/
Join us for the 14th annual Polar Prowl at the Stenger Sports Complex in Arvada, CO! As the first Denver-area half marathon of the year, this event features 5K, 10K, and half marathon courses that meander along the Van Bibber Creek Trail, offering breathtaking views of Arvada's open spaces and Table Mountain. Because the courses are relatively flat, it is the perfect opportunity to chase a personal record or secure a qualifying time for the BOLDERBoulder. We are proud to support Penguins International with this event, and we invite you to join our penguin costume contest. The layout is incredibly spectator-friendly, featuring a viewing area just a short walk from the venue where fans can cheer on half marathoners three times and 5K or 10K athletes once before they hit the finish line.