Question: when did the diamondbacks become a baseball team
Answer: Arizona Diamondbacks 2018 Arizona Diamondbacks season Established in 1998 Team logo Cap insignia Major league affiliations National League ( 1998 -- present ) West Division ( 1998 -- present ) Current uniform Retired numbers 20 51 42 Colors Sedona Red , Sonoran Sand , Black , Teal , White Name Arizona Diamondbacks ( 1998 -- present ) Other nicknames The D - backs , The Snakes , The Rattlesnakes Ballpark Chase Field ( 1998 -- present ) a.