Kelly Flats / Heart Attack Hill = Moderate trail near Ft. Collins, CO

11 mi trail
High Point 8,653 ft Low Point 6,787 ft
Difficulty = Extreme {Only is you do the Chutes}

Technical Rating 9/10 {Maybe a 4 if you only do Heart Attack Hill}
Head straight uphill from out of the Cache La Poudre River Valley and wind across a a ridge high above the Mummy Range. Two well-known obstacles, The Chutes and Heart Attack Hill. Both have bypasses, but they aren't easy. ATVs will have an especially hard time on this trail.

Difficult. The first part of trail is extremely steep and rocky. Middle is easy as it passes through a residential area. Last part can have large mud holes after a rain. Body damage is a frequent occurrence on the Chutes.

*Fun easy trail that will challenge your nerves with Heart Attack Hill. The rest of the trail is scenic and mild.

Also check out other Trips & Adventurous Activities in Timnath.