CBS aired the program on weekday mornings, initially telecast live in the Eastern and Central time zones at 8:00 am (ET)/7:00 am (CT) for its first four years (it would eventually be scheduled for 8:00 am in all time zones). Same-day episodes would be broadcast on kinescope for Western audiences, as Keeshan would not perform the show live three times a day. For the first three months, "Captain Kangaroo" was only seen on weekday mornings. From December 1955 until 1968, the show was also seen on Saturday mornings, except in the 1964–1965 season, when it was replaced by a Keeshan vehicle called "Mr. Mayor". Except for pre-emption by news or special events, notably the four-day continuous coverage which followed the November 22, 1963 assassination of John F. Kennedy, and a few shows that were 45 minutes, the show aired a full 60 minutes on weekday mornings until 1981. It was broadcast in color from September 9, 1966 onward.