The KlaasKids Foundation organized Saturday's search.
More than 400 people showed up to the Find Sierra Search Center located at Burnett Elementary School in Morgan Hill.
Volunteers walked the neighborhood and hiked through hilly, grassy and muddy terrain. But they found no signs of the missing cheerleader.
The 15-year-old was last seen a month ago on her way to catch the school bus.
Community search director Brian Miller said: "I do know that having the community support, the team support and the media support for keeping the message out there does help. That's what we are going to keep doing."
The search for LaMar continues Sunday. Anyone wishing to participate can show up at Burnett Elementary at 8 a.m.