Is it legal to ride your bicycle on the sidewalk in bethesda Maryland?

Basically riding on the sidewalk is illegal in MD except where it is specifically allowed. One place it is allowed is Montgomery County.

From the Montgomery County Code:

Sec. 31-5. Driving over curbs, sidewalks or drainage structures.

...

(b) Bicycles which are not motorized and special vehicles used by handicapped persons may be operated upon sidewalk areas and appurtenant drainage structures designed for pedestrian use except where, in the judgment of the county executive, it is necessary for the safety or control of vehicular and pedestrian traffic to prohibit riding of such vehicles. Whenever any person is riding upon a sidewalk, such person shall give an audible signal and yield the right-of-way to any pedestrian. The county executive may, by regulation adopted under method (3) of section 2A-15 of this Code, define "special vehicle" and "handicapped;" establish licensing requirements; and establish hours during which special vehicles may be operated upon sidewalk areas.