I ride Schaeffer farms and Little Bennett almost every week.
Schaeffer farms is probably the most popular one in Moco. You can link it to the trails from Seneca Creek for a longer 15-30 miles ride.
Trailforks is a good resource to find trails.
Here is a link of the Moco county ride from last month. Routes option range from 5 - 70 miles.
2022 MoCo Epic - October 7-8, 2023 (Raindate: October 14-15) LET THE COUNTDOWN BEGIN 00 DAYS : 00 HOURS : 00 MIN : 00 SEC The MoCo Epic is MORE's largest annual fundraiser and community event. Profits from the MoCo Epic support MORE's work to provide public, natural surface trails for everyone...
more-mtb.org
When you get a real mountain bike and want to go to the next level, check out the two largest MTB trail systems in Maryland: Patapsco Valley State Park and Frederick Watershed.
The downhill trails in Watershed are world class.