Allegheny County
https://www.nps.gov/choh/planyourvisit/conditions.htm
Anne Arundel County
B and A trail
BWI Trail
Downs Park
Kinder Farm Park
Quiet Waters Park
Baltimore County
Frederick County
Sugarloaf Mountain
Harford County
Susquehanna State Park
https://dnr.maryland.gov/publiclands/pages/central/susquehanna.aspx
Howard County
Centennial Park
Patapsco
Montgomery County
C and O canal
https://www.nps.gov/choh/planyourvisit/conditions.htm
Great Falls
https://www.nps.gov/grfa/planyourvisit/directions.htm
Prince Georges County
Watkins Regional Park