These are the late night Monday-Friday schedules on all three networks for each calendar season beginning September 1955. All times are Eastern and Pacific.
Talk shows are highlighted in yellow, local programming is white.
Schedule
edit| 11:00 PM | 11:30 PM | 12:00 AM | 12:30 AM | 1:00 AM | 1:30 AM | 2:00 AM | 2:30 AM | 3:00 AM | 3:30 AM | 4:00 AM | 4:30 PM | 5:00 AM | 5:30 AM | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ABC | local programming or sign-off | |||||||||||||
| CBS | local programming or sign-off | |||||||||||||
| NBC | 11:15 PM: Tonight Starring Steve Allen | local programming or sign-off | ||||||||||||