The fourteen miles of point-to-point alternating gravel and dirt that is the Coal Creek Trail winds between open space and residential sections along the creek from Superior to Erie, passing through Louisville and Lafayette on the way. It's flat and easy enough to bike year-round, including in the winter, when the snowpack usually builds up a solid enough surface to bike on fat tires or snow bikes. In nicer weather, picnic tables and benches offer rest stops, and there are a few restrooms, as well. If you long for more time out there, Coal Creek intersects with several other cool paths, including Flagg Park and the Rock Creek Trail.
bouldercounty.org