Winterhaven is a census-designated place in Imperial County, California. Winterhaven is 6.5 miles east of Pilot Knob, The population was 394 at the 2010 census, down from 529 at the 2000 census. It is part of the El Centro, CA Metropolitan Area. North of Interstate 8 and bordering Yuma, Arizona, the town is partly in the Fort Yuma Indian Reservation. The Colorado River marks the town's southern border.