<Tr> <Th> Picture format </Th> <Td> Black and white (1955--1966) Color (1966--1975) </Td> </Tr> <Tr> <Th> Original release </Th> <Td> September 10, 1955 (1955 - 09 - 10)--March 31, 1975 (1975 - 03 - 31) </Td> </Tr> <P> The TV series ran from September 10, 1955, to March 31, 1975, on CBS, with 635 total episodes . It was the second Western television series written for adults, premiering on September 10, 1955, four days after The Life and Legend of Wyatt Earp . The first 12 seasons aired Saturdays at 10 pm, seasons 13 through 16 aired Mondays at 7: 30 pm, and the last four seasons aired Mondays at 8 pm . During its second season in 1956, the program joined the list of the top ten television programs broadcast in the United States . It quickly moved to number one and stayed there until 1961 . It remained among the top 20 programs until 1964 . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (August 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table>

When did the show gunsmoke start and end
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