1959 | 32 Episodes

Season 1 of Bonanza premiered on September 12, 1959.

1960 | 34 Episodes

Season 2 of Bonanza premiered on September 10, 1960.

1961 | 34 Episodes

Season 3 of Bonanza premiered on September 24, 1961.

1962 | 34 Episodes

Season 4 of Bonanza premiered on September 23, 1962.

1963 | 34 Episodes

Season 5 of Bonanza premiered on September 22, 1963.

1964 | 34 Episodes

Season 6 of Bonanza premiered on September 20, 1964.

1965 | 33 Episodes

Season 7 of Bonanza premiered on September 12, 1965.

1966 | 34 Episodes

Season 8 of Bonanza premiered on September 11, 1966.

1967 | 34 Episodes

Season 9 of Bonanza premiered on September 17, 1967.

1968 | 30 Episodes

Season 10 of Bonanza premiered on September 15, 1968.

1969 | 28 Episodes

Season 11 of Bonanza premiered on September 14, 1969.

1970 | 28 Episodes

Season 12 of Bonanza premiered on September 13, 1970.

1971 | 26 Episodes

Season 13 of Bonanza premiered on September 19, 1971.

1972 | 16 Episodes

Season 14 of Bonanza premiered on September 12, 1972.