Nick Clark posted the route:
The trailhead for Round is 7 or 8 miles (maybe more) west of Loveland on Hwy 34. Two or 3 miles west of the Big Thompson Narrows, there is a pull-off to the left. This leads to the parking lot for Round. Route goes from trail map to big cairn at Summit: 4.8 miles & 3,000'. 95% singletrack.
Note: The Round Mountain Trail ascends Sheep Mountain (confusing!)
There is a Strava segment for this route, but so far no one on Strava has reported breaking Waggoner's 2010 time.
I'm about to do this. Is the time out and back, or summit?