Starting in 1954, there were perhaps a dozen local stations around the country who had the capability to air film programs in color. I Lived in one of those markets and remember seeing "The Cisco Kid" in color in the late fifties. It was syndicated. Another series aired in color locally at that time was "The Adventures of Long John Silver". You can see clips from that series at:

http://www.liketelevision.com/web1/classictv/longjohn/