Event details subject to change. Please confirm all information via event website.
Week of Events
Sunday, May 17, 2026
-
May 17, 2026 -Colfax Marathon
-
May 17, 2026 -Wild Horse Half Marathon
-
May 17, 2026 -Miles for Smiles 5K
Colfax Marathon
New for our 20th Year! “WOW” at Every Mile To celebrate our 20th, every mile will have a WOW for runners. That moment every mile that gives you that WOW and extra energy for the miles to come. We are inviting local musicians, artisans, drumlines, choirs, … to be part of our WOW for our […]
Wild Horse Half Marathon
Set against the breathtaking backdrop of the luxurious High Lonesome Ranch, this isn’t just a race—it’s a full weekend of adventure and celebration! Runners will enjoy a country cookout, campfires, live local music, and camping accommodations. It’s the perfect blend of rugged terrain and western hospitality, complete with a lively hoedown to round out the weekend. […]
Miles for Smiles 5K
The Miles for Smiles 5K is a friendly event that begins and ends on the track at the North Area Athletic Complex (NAAC) in Arvada with a scenic trek along the Fairmount Trail in the middle. Join Right Start Events on May 15th, 2022 for this 5K and Adaptive Dash.
Monday, May 18, 2026
No events on this day.
Tuesday, May 19, 2026
-
May 19, 2026Dash and Dine 5K #4
Dash and Dine 5K #4
The Dash & Dine 5k run, Boulder’s favorite spring tune-up run series is back for 4 races in May at the beautiful Boulder Reservoir in Boulder, CO.
Wednesday, May 20, 2026
No events on this day.
Thursday, May 21, 2026
No events on this day.
Friday, May 22, 2026
No events on this day.
Saturday, May 23, 2026
-
May 23, 2026 -Samson’s Revenge Trail Race
Samson’s Revenge Trail Race
Samson was the celebrity elk of the Rockies until he was illegally poached in 1995 on YMCA grounds. Our race runs on Samson's home turf, The YMCA of the Rockies, which his descendants still call home. The course is fast single track with a big King of the Mountain challenge slapped in the middle. This […]
Please click here to submit your event for FREE to our online calendar.
We do not allow events without physical locations (IE – virtual runs, runs with locations TBD, etc…).
Please allow 48 hours after submission for an event to appear on the calendar. If you have already listed your event and would like us to update it, please contact us.