5K to 75 miles
Start with the experience you want, then choose the distance. Every course returns to the same hot food, cold drinks and legendary Bohn Park finish.
Quick compare
| Challenge | Start | Terrain | Expected time | Level |
|---|---|---|---|---|
| 5K Run | 10:30 am | 50% trail, 50% paved | 35-75 min | Welcoming |
| 10K Run | 10:00 am | Trail, gravel and paved | 35-90 min | Intermediate |
| Half Marathon | 9:30 am | Road, gravel and trail | 1.5-3.5 hr | Big day |
| 23 Mile Bike | 12:30 pm | Gravel and paved roads | 1.5-3 hr | Welcoming |
| 40 Mile Bike | 12:00 pm | Mixed gravel and paved | 1.5-3.5 hr | Challenging |
| 75 Mile Bike | 9:00 am | Gravel, road and snowy trail | 3.5-6 hr | Expert |
| Mini Run/Bike Combo | See event schedule | Trail, paved paths and gravel | Run + ride | Double adventure |
| Run + Bike Combo | 10:00 am | Trail, gravel and paved | 3-5 hr | Multi-sport |
01 / 07
All the winter fun in a walkable, dog-friendly 5K.
First-timers, walkers, families and runners with dogs.
02 / 07
A scenic winter tour of trails, red rock and gravel paths.
Runners who want a classic distance without an all-day commitment.
03 / 07
A mostly flat tour of rivers, gravel paths and double track.
Distance runners chasing a memorable winter half.
04 / 07
Dip a tire into mixed-terrain winter riding.
Curious gravel riders and confident recreational cyclists.
05 / 07
THE classic Boulder County gravel route.
Experienced road or gravel riders ready for winter.
06 / 07
The legendary course: canyons, snow, Rowena single track, and grit.
Experienced riders who want the full Old Man Winter story.
07 / 07
A 5K run and a 23-mile ride. One big winter celebration.
Athletes who want a shorter run-and-ride challenge.
08 / 07
Run first, ride second, celebrate twice.
Solo athletes or relay teams who refuse to choose.
The no-ego chooser
New to winter events? Start with the 5K or 23-mile ride.
Want a hard, social morning? The 10K or 40-mile ride fits.
Chasing the full story? Choose the half, 75 or run-bike combo.
Old Man Winter · 2027
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February 7, 2027
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