Zone (UTC -7 hours). Observes daylight savings time? No.   Winterhaven, CA x http://en.wikipedia.org/wiki/Winterhaven,_California   Winterhaven (formerly, Karmack ) is a census-designated place (CDP) in Imperial County , California . Winterhaven is located 6.5 miles (10 km) east of Pilot Knob , The population was 394 at the 2010 census, down from