OverviewThe Green Mountain "Loop", as it is shown, is not a loop, but an alternate trail off of the CT. You can take the Green Mountain Trail and then come back on the CT, making a loop. though. It is a steep, fairly hard push near the bikeable end of the CT in the area.
Trail DescriptionExclusively dirt singletrack, it gains a bit of elevation quickly, and then has a kickin' descent back to the CT. Very fun.
Getting ThereYou can access it off of the CT, or from the Buffalo CG, you can head uphill east until you get to the branch trail. I have never ridden it west to east.
When to BikeThis trail is fully shaded and a little higher than the other trails in the area, however, the typical area info is applicable.