Bumping this thread - someone on Facebook's TV Archives group posted pages from a 1967 TV Guide. Here's the breakdown:
ABC: all of their daytime programs are in black and white (Supermarket Sweep, The Dating Game, The Newlywed Game, Dream Girl of '67, General Hospital, The Nurses, Dark Shadows, Where the Action Is, plus reruns of The Donna Reed Show, Father Knows Best, and Ben Casey).
CBS: only Password and House Party, plus network news cut-ins, are in color. Everything else (Love of Life, Search for Tomorrow, The Guiding Light, As the World Turns, To Tell the Truth, The Edge of Night, The Secret Storm) is in black and white. And so is Captain Kangaroo, as well as reruns of Candid Camera, The Beverly Hillbillies, The Andy Griffith Show, and The Dick Van Dyke Show.
NBC: everything is in color (Reach for the Stars, Concentration, The Pat Boone Show, The Hollywood Squares, Jeopardy!, Eye Guess, Let's Make a Deal, Days of Our Lives, The Doctors, Another World, You Don't Say!, Match Game, plus Today and network news cut-ins).