Zinn Fondo - Group Ride

Name: Zinn Fondo - Group Ride
Start: 2026-06-14T08:00:00-06:00
End: 2026-06-14T14:00:00-06:00
Location: 1655 Cannon Cir. , Louisville, CO, United States, Colorado 80027

Schedule

Sun Jun 14 2026 at 08:00 am to 02:00 pm

UTC-06:00

Location

1655 Cannon Cir. , Louisville, CO, United States, Colorado 80027 | Louisville, CO

The Zinn Fondo (largely) mountain gravel and road ride will start and finish at the Zinn Cycles shop in Louisville. Riders can choose one of four loops of approximately 60km, 85km, and 100km in length. There will be a ride leader for each loop. All three loops will be primarily on bike paths and dirt roads and we will have a road only route for those who don't like gravel. The “Corto” (short loop) goes up Chapman Dr. and down Flagstaff Rd. The “Medio” (medium loop) goes up to Gold Hill via Fourmile Canyon Dr. and Gold Run Dr. and returns via Sunshine Canyon Dr. The “Lungo” (long loop) follows the Medio loop with the addition of a left turn at Salina to continue along Fourmile Creek to Pennsylvania Gulch and up Switzerland Trail to Gold Hill Rd., rejoining the Medio loop at the Gold Hill Store.
The Zinn Fondo is also an official training ride for the Ride Collective events, Copper Triangle, Enchanted Circle, Tour of the Moon, and Tour De Vineyards
Zinn Fondo Gravel technical details:
Corso Corto (short loop): 59km, 2,300 feet of climbing (start/finish at Zinn Cycles shop)
OR, with alternative start/finish in Boulder at Eben G. Fine Park: 20km, 1,300 feet of climbing
Corso Medio (medium loop): 87km with 4,200 feet of climbing (start/finish at Zinn Cycles shop)
OR, with alternative start/finish in Boulder at Eben G. Fine Park: 37km, 3,200 feet of climbing
Corso Lungo (long course): 98km with 4,700 feet of climbing (start/finish at Zinn Cycles shop)
OR, with alternative start/finish in Boulder at Eben G. Fine Park: 48km, 3,700 feet of climbing
Climbing Switzerland Trail entails significant technical challenge on a road or gravel bike.
The descents of Sunshine Canyon and Flagstaff Mountain are not to be taken lightly—use appropriate caution. You and only you are responsible for your safety.
Start time 8AM at Zinn Cycles, 1655 Cannon Cir. Suite 100 in Louisville. When you get back there will be burgers and brats grilling for you and ice cold drinks.
Alternative meeting/start time is approximately 9-9:15AM at Eben G. Fine Park bathrooms.
This is an unofficial ride with no entry fees and no feed stations. Riders are welcome to start and stop wherever and whenever they want and to join and leave the ride wherever and whenever they want. Stopping for food and drink at the Gold Hill Store is encouraged. E-bikes welcome.
*The Zinn Fondo ride started 38 years ago, in 1988, on Lennard Zinn’s 30th birthday. The idea was to ride in the mountains from dawn to dusk (or later!), enjoying companionship and great views with good friends. Many routes were used. The original route, repeated, a few times was the “Grand Loop” from Boulder, comprising 369km (229 miles), 19,000 feet of climbing, and two crossings of the Continental Divide via Estes Park, Trail Ridge Rd., Granby, Winter Park, Berthoud Pass, Idaho Springs, Peak to Peak Highway, and Nederland, finishing back in Boulder.
Zinn Fondo distances and elevation gain have moderated now, as Lennard is turning 68 and has a heart arrhythmia and an e-bike. What hasn't changed is enjoying a friendly ride in the mountains with good people. This time, the course isn't changing, either. In the interest of keeping a known, wonderful, favorite route of Lennard's that our friends can count on and put on their calendars, it makes sense to keep it the same for now. We hope you'll join us!