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The Challenge Series is a pre-planned series of 20 century-type rides that span the cycling season and are designed to challenge you, to show you roads you may not have ridden both close to home and across the state, and to foster the development of a community built around endurance riding.

The series is a mix of road, gravel, and mixed surface rides. We describe them as “century-type” rides as many of the rides are less than 100 miles, but are difficult in other ways.

Below are the rides for 2021: (Note that finalizing dates is still a work in progress. Full Details for each ride will be posted on our Meetup calendar as they become available)

2021 Rides:

Saturday Feb 20: Aurora - Strasburg plains loop (road). Details...

Saturday Mar 6: Pawnee Grasslands Gravel Grinder (gravel). Details...

Saturday Mar 27: Hygiene - Rist Canyon Century (road). Details...

April TBD: Golden - Bergen - Evergreen Climbing (road)

April TBD: Cañon City - Phantom Canyon - Shelf Road Loop (gravel)

Saturday May 8: Lyons - Glen Haven - Estes Park - Allenspark Loop (road)

May TBD: Trinidad Gravel Loop (gravel)

May TBD: South Jeffco Climbing Extravaganza (road)

June TBD: Golden Anti-Gravel Epic Century (mixed)

June TBD: The Big Classic: Boulder - Gold Hill - Gap Road - Gross Res (mixed)

Saturday Jun 26: Copper Mountain - Leadville -Vail loop w/ Turquoise Lake (road)

Saturday July 10: Boulder - Magnolia - Eldora - Brainard Lake - Lefthand Canyon loop (road+)

July TBD: Winter Park Gravel (gravel)

July TBD: Vail - Muddy Pass - Shrine Pass Loop (gravel)

August TBD: Buena Vista - Cottonwood Pass - Taylor Reservoir and return (road)

August TBD: Idaho Springs Climbfest: Guanella Pass - Loveland Pass - St Mary’s (road)

September TBD: Boulder - Gold Hill - Ward - Super James - Lyons (mixed)

September TBD: Idaho Springs Mixed Surface Figure 8 - Virginia Canyon - Little Bear Creek (mixed)

September TBD: Roaring Fork Valley Century (road+)

October TBD: Red Feather Lakes Gravel Loop (gravel)


All rides are subject to being rescheduled or canceled due to weather or other reasons.

Out-of-town rides are expected to be paired with an additional shorter ride on the opposite day to make for a fun weekend getaway!

Ride Culture:

These are drop rides—that’s just the nature of things when they get long and hard. On the road the rides will break up into multiple groups. The front group will often push the pace; other groups will not. What group you ride with is up to you. These are not races and there is no award for finishing first.

A primary goal of the series is to have fun and make the kind of friends you can only make on a hard ride. Occasionally waiting a minute or two for others to catch up goes a long way toward making this happen! We also have designated regroup points at stores on each ride.

We do look out for each other if someone has a mechanical or other issue on the ride. But we also expect that you’ll come out with a bike that is ready for a big ride.

Ride Leaders:

We would like to have a two-person ride leader team for all of these rides. If you are interested in helping out on a particular ride, read more about it and then contact Mark Michel to volunteer. Helping to lead a ride is fun and is a valuable way to help out the club!


As these are club rides, there aren’t really any rules beyond basic common sense:

-Sign our insurance company’s waiver at the start

-Wear a helmet

-Follow the rules of the road

-Error on the side of safety

-Always have fun!


These are unsupported club rides and therefore have no cost beyond your club membership.

Unexpected conditions:

All rides are subject to being rescheduled or canceled due to weather or road conditions. Additionally, on any ride the weather can turn bad or a road on the planned route may turn out to be unsafe for riding. Always prioritize safe riding. This can involve changing the route on the fly.

Who Was Charlie Henderson?

Charlie Henderson was one of the founders of RMCC back in 1993 and was our club President for many years before passing away in 2017. His goal was to have a club that provided a year-round series of rides that helped people develop their cycling fitness. His countless hours of work were the driving force behind building our cycling community. Charlie was always up for a challenge and was always encouraging others to try something just a little bit harder than they had done before. While the structure of this series of rides is new, it is intended to be in the spirit of what Charlie built. For those of us who knew Charlie, we still miss him but his spirit lives on with us in this series.