Towers Road, in the Horsetooth Mtn trail system, is a well-established Fort Collins time-trial route - mainly for mountain bikers, but also for trail runners.
The FKT route begins at the trail map in the Soderburg (lower Horsetooth) parking lot. Begins with a .4 mile singletrack connector to Towers Road where you make a left and head up the mountain. Near the summit, Towers forks. Take the left fork, followed by a quick right at another fork. Route ends with a slap of the building through the clearing after the right fork. 3.4 miles with 1,800' of climbing.
There is a Strava segment for this route, which records more recent FKTs.