After graduating from Fresno Pacific College, Adams became an assistant coach for the basketball team in 1969. Following a 7–20 season in 1971–72, Adams was promoted to be head coach. Fresno Pacific went 19–7 in 1973–74, Adams's second season as head coach.[6] While head coach at Fresno Pacific, Adams completed a master's degree in physical education at California State University, Fresno in 1974.[5]
From 1980 to 1986, Adams was an assistant coach at Fresno State under Boyd Grant. During this time, Fresno State won the PCAA Tournaments of 1981, 1982, and 1984.[9] Adams took over as head coach after Grant resigned following the 1985–86 season.[5][10] Adams's best season at Fresno State was a 15–14 season in 1988–89; in four seasons, Adams went 43–72.[11]
On July 3, 2014, Adams joined the Golden State Warriors as an assistant coach under first-year head coach Steve Kerr.[15] The Warriors finished the regular season 67–15 and in first place in the Western Conference. Adams won his first championship after the Warriors defeated the Cleveland Cavaliers in six games of the 2015 NBA Finals.
The Warriors finished the regular season 2016-17 NBA season with 67 wins and first place in the Western Conference. Adams won his second championship in three years after the Warriors defeated the Cleveland Cavaliers in five games of the 2017 NBA Finals.
The Warriors finished the regular season 2017-18 NBA season with 58 wins and second place in the Western Conference. Adams won his second straight championship when the Warriors defeated the Cleveland Cavaliers in four games of the 2018 NBA Finals.
The Warriors finished the regular season 2021-22 NBA season with 53 wins and third place in the Western Conference. Adams won his fourth championship when the Warriors defeated the Boston Celtics in six games of the 2022 NBA Finals.