San Mateo Halloween Boo's on B Street

& Trick or Treating

 October 25, 2025,

B Street Pedestrian Mall (Between 1st & 3rd Avenue)
Downtown San Mateo, CA
cityofsanmateo.org

 Boo's on B Street is an annual tradition in which parents take their goblin children downtown to trick or treat for Halloween. Though the date isn't always on Halloween (October 31), it's conveniently held on a Saturday so that nearly everyone can make it to the lively scene.

Costumed characters dressed like princesses, villains, action heroes, animals and even ghosts, come out to show off their costumes and get candy from merchants along B Street.

Entertainment is included in this free event that's not to be missed! It's absolutely free.

Events are not guaranteed. It is your responsibility to confirm before going.