Showing 29 events within 50 km in the next 365 days. Page 2 of 2.
Sun, Sep 06, 2026 at 10:00 AM
Voted best 10k in the state of Colorado by Colorado Runner Magazine in 2010!
This is a challenging trail run with beautiful terrain and breathtaking scenery. The 10K race begins at 10,000 ft at the
summit of Rabbit Ears Pass. The course begins by heading uphill on USFS dirt roads and 2 track, and then then heads downhill on single-track, ending on a cross country single-track. The total elevation gain and loss are about ~1,200 feet each.
*Although this race is listed as a 10k, the actual distance comes out to 6.8 miles. We will have one aid station on the course about 3.4 miles in (the 5k race option does not have an aid station). We HIGHLY recommend that you bring your own water.
4 Miles 10k 8 Miles Run Trail
Fri, Sep 11, 2026 at 5:00 AM
If you've ever experienced fall in the Rocky Mountains you know what a magical time it is. With cool temperatures, sunny days, and stunning scenery, many people believe autumn is the best time to get
out and enjoy the high country. And while a drive up through the mountains in the fall can be a nice way to spend a day, we think you should take it one step further. We think you should get out and experience it on foot!
The Flaming Foliage Relay takes the best parts of the old Outward Bound Relay route and throws in some new and scenic challenges. This relay begins in the quaint town of Idaho Springs and traverses 165 miles and three rugged mountain passes before finishing in charming Buena Vista on the banks of the Arkansas River. Along the way you'll run on roads and trails through some of the most amazing scenery Colorado has to offer. Join run.Colorado relays for the Flaming Foliage Relay Friday September 11th through Saturday September 12th, 2026.
This life changing relay road race is a team-oriented adventure with experiences and views you'll never forget. Each team consists of either twelve runners and two vehicles (the vast majority of the teams) or six runners and one vehicle (Ultra teams), or any other amount of runners including a solo unsanctioned race.
How to Register
Team Captains should be the first to sign up:
Submit team payment
Set up a team name and password and share with team members. Note: You can sign up a full team before you have secured commitments from all team members
Select team volunteer option
Once the Team Captain registers, they will share the team name and password with their teammates, so all teammates can register/join their team with no additional registration cost.
Choose your Volunteer Option
Fun Fact: This overnight relay race is made possible by over 130 volunteers on the course. Most volunteers are either friends/family of the race directors, team members running the event OR a local nonprofit raising awareness and funds for their cause or organization. Each team is given two options to help us make this event possible while giving back:
Option 1: Supply Volunteers: 10 person teams will supply two (2) volunteers; Ultra teams and High School teams will supply one (1) volunteer to staff the runner exchanges.
Option 2: Teams can choose to make a tax-deductible donation to Windsor Gives, 501(c)3 non-profit to support with providing volunteers for the relay.
10 Person Team Volunteer Fee: $300
Ultra Team Volunteer Fee: $200
High School Team Volunteer Fee: $100
**The Team Captain is the only one who chooses the teams volunteer option during the registration process and who pays the registration fees. Additional team members should have no fees at the end of their registration/joining the appropriate team.
165 Miles Relay Run Trail Ultra
Sat, Sep 12, 2026
7.1 km from Tabernash5k 10k 33k 50k Half Marathon Ultra
Sat, Sep 12, 2026 at 7:00 AM
28.6 km from Tabernash22k 50k Ultra
Sat, Sep 12, 2026 at 8:00 AM
IFRAME: https://www.youtube-nocookie.com/embed/eLMy2zVm93o?&wmode=opaque&rel=0
Come experience all that beautiful Nederland, CO has to offer at 8,236’!
Your participation directly supports TEENS,
Inc. Providing opportunities through early childhood education, an alternative high school, job training, recreation and leadership development programs.
NedNed has been running for 44 years! Come and explore the best of trail running around Nederland. Our world class trails will inspire and challenge you as you take on the trail 10k or Half Marathon. Our road 5k is family (and pet) friendly and is a great way to see Nederland.
5k 10k 21k Run Trail
Sun, Sep 13, 2026 at 7:00 AM
RUN AMONG THE PEAKS
⛰️Estes Park ⛰️ Georgetown to Idaho Springs ⛰️ Mt. Sneffels ⛰️ Ned Ned Trail Fest ⛰️Lead King Loop
We all love a Colorado original - and nothing feels quite like running at
altitude (literally)!
Four of Colorado's most beloved half marathons, plus one unforgettable 25K, have joined forces with HAL Sports to create the Colorado Mountain Half+ Series!
This isn't just a series of races. It's an invitation to Run Among the Peaks! And what's more, the invitation is super flexible: sign up for any 3, 4, or ALL 5 events!
From breathtaking views to challenging climbs, each course showcases Colorado at its best - challenging, inspiring, and unforgettable. Some will take your best effort, but all of them will have you bragging about your success every chance you get!
What's more: every event in the series is proudly organized by nonprofits that support local youth programs, meaning every mile you run helps strengthen our communities and the next generation.
Why should you register for the Series?
~Because you're not afraid of a little altitude!
~Because you want to explore our beautiful State.
~Because collecting points at every race and chasing series awards sounds way more fun that sitting on the couch!
~AND because medals look way better at altitude.
21k Run Trail
Sun, Sep 13, 2026 at 7:00 AM
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.
14 Miles 35 Miles 42.3 Miles 50 Miles 60 Miles 70 Miles 75 Miles 100 Miles Cycling Gravel
Thu, Sep 24, 2026 at 7:00 PM
CG Adventure Trip – Mountain Experience
This event is a guided CG adventure weekend designed to combine structured training, accountability, community, and an elevated mountain experience.
Participants can choose from three registration options based on how much support, logistics, and included amenities they prefer.
All registration tiers include CG leadership, communication, and on-site support.
All-In Adventure Package – $400
This option includes full logistical support, meals, swag, and training guidance. Participants selecting this package can focus entirely on the experience.
Includes:
Gondola ticket (Thursday)
Lunch at Sunspot
Catered group dinner
Group yoga session
Full CG swag package (shirt, sweatshirt, beanie, water bottle)
Structured training plan
Accountability leading into the event
Ongoing communication and logistical coordination
Race preparation guidance, including pacing, fueling, and mindset
On-site CG leadership throughout the event
Basic Experience Package – $250
This option is designed for athletes who want coaching, structure, and event support without included meals or full swag.
Includes:
Structured training plan
Accountability and communication leading into the event
Race preparation guidance (pacing, fueling, mindset)
Group yoga session
Full CG swag package (shirt, sweatshirt, beanie, water bottle)
On-site CG leadership and support
Thursday dinner included
Starter Adventure Package – $150
This option is for athletes who prefer to handle their own logistics but still want access to training guidance and group support.
Includes:
Training plan
Group communication access
Accountability and check-ins
Race weekend guidance and on-site support
Full CG swag package (shirt, sweatshirt, beanie, water bottle)
22 Miles 42 Miles
Sun, Sep 27, 2026
49.2 km from Tabernash5k 10k Half Marathon Marathon Run