Table Mountain is a flat-topped basalt mesa rising above the Feather River valley west of Oroville, formed by a prehistoric lava flow that capped the ridge and protected it from the erosion that wore down the surrounding hills. In most seasons it's an unassuming ridge of dark rock and dry grass, but from mid-March to mid-April it becomes one of the most spectacular wildflower displays in California's foothills.
The show is driven by a combination of factors: the basalt rock is impermeable to water, which creates seasonal vernal pools on the plateau surface and keeps the soil saturated long after surrounding areas dry out. This wet microclimate supports enormous concentrations of goldfields (Lasthenia californica), owl's clover, blue dicks, and shooting stars that blanket the mesa in waves of yellow, purple, and white. In peak bloom years, the plateau looks almost painted.
Access is from Cherokee Road west of Oroville; informal trails lead up onto the plateau. There's no formal trailhead or park infrastructure — you're walking on mostly private land that landowners have traditionally tolerated hikers on during wildflower season, but this can change. The bloom is highly variable and weather-dependent; a wet winter produces a spectacular display, while a dry year may disappoint. Local wildflower watchers post bloom reports online in March that will give you a current read on conditions before making the drive.