Hey, I'm from southern vermont. If you're around that area some of my favorite places to ride are:
Sport Trails in the Ascutney Basin (STAB) in Ascutney/Brownsville- This is a really cool network of singletrack trails. Challenging and fun at the same time. Some of them are kind of technical, but you can get away with riding them on a hard tail.
Pine Hill Park located at Georgetti park in Rutland- These trails are smooth and manicured in most cases, meaning that they can be ridden fast. The climbers are almost so flowy that you don't even notice that you're biking uphill. Also a lot of cool ladder bridges and some nice vistas. There are a few freeride trails that would require something more rugged with full suspension, but I hit most of it with my old Jamis.
Haven't ridden them yet, but I've heard that Green Mountain Trails in Pittsfield are pretty sweet too. I've talked to the guys that build there and they seemed like they knew what they were doing.
So, definitely go up to kingdom and burke if you have the time, but there's also plenty of stuff right in southern VT. Happy biking!