The cat was seen at about 7:40 p.m. in the area of the 100 and 200 blocks of Willowbrook Drive.
San Mateo County sheriff's deputies responded to the neighborhood, but the mountain lion had moseyed elsewhere by the time they arrived.
Residents are advised not to approach mountain lions, and should avoid hiking or jogging at dawn, dusk, and night, when the animals are most active.
In the event of a mountain lion encounter, emergency officials advise residents to try to appear large and make noise.
More information about mountain lions can be found at www.keepmewild.org.