Some well maintained single track with some challenging hills and lots of at grade stream crossings makes the Muddy Branch Greenway Trail a good time. Along the whole length, the trail is well marked by blue blazes and the single track is easy to follow, even with the falling leaves of the season blanketing the ground. Most of the trail is well packed single track, with a few root filled sections and one area that is pretty well packed with rocks. Otherwise, this is a great trail to ride or include in a longer ride.
There are a couple of areas where you need to ride along the local roads, but it isn't too bad. Riding north, you'll turn right and head .3 miles down the hill until you see Query Mill Road on your left. Turn there, and immediately heft your bike over the guardrail on the left side of the road. The trail will pick up from here.
Still heading north, at the top of this section, you'll exit on to Query Mill Road. Turn left and look for the pair of single lane bridges and head in their direction. Over the second bridge and on the left side of the road, you'll see a small brown sign for pointing towards a short section of the trail that will pop you out at the intersection of Query Mill Road and Turkey Foot Road. At that intersection, the trail head is directly across the intersection, at the end of the guardrail. All the other road crossings (and there are a few) are well marked.
This trail is a blast to ride. Nothing too technical, but just enough there to keep you interested. And the varied terrain also works to keep you on your toes. Just another gem that Montgomery County has to offer.