Mount Vaca stands on the Napa-Solano county line in Northern California as the highest point in both the Vaca Mountains and Solano County, and in winter it can be one of the Bay Area peaks to receive snow. Its name comes not from cattle but from Juan Manuel Cabeza Vaca, who, with Juan Felipe Pena, received the Rancho Los Putos Mexican land grant in 1843, including the peak. Reached from Vacaville by canyon roads linking to Blue Ridge Road, the summit also serves regional forecasting, with a high-definition Doppler radar improving detection of northwestern storms and aiding warnings for heavy rain, high winds, and flooding.