The West Rainbow Trail Run is an out and back trail run which starts at the Rainbow Trailhead off 285 just south of Mears Junction. This is where the Rainbow Trail crosses 285.
Go west on the Rainbow Trail. This trail starts out on the old railroad grade but soon takes its own course very steeply to begin with. Once the initial elevation is gained, it becomes a nice hilly run through meadows and forests loosing and gaining elevation all the way to the end.
The trail ends at the Silver Creek road where the Otto Mears Toll Road begins. It is a 9 mile one way run an can be shortened slightly by running back down the road.