Warringah Rugby Club formed a senior club in 1963 to supplement the already established Warringah Junior Rugby Union and commenced playing in the Sydney second division in 1964. The aims of the club were to provide rugby for juniors, colts and grade players and to eventually join the 1st Division competition. In 1970 the Club won the 2nd Division Premiership and was promoted to the 1st Division for the 1971 season.
Warringah players are affectionately known as the Green Rats, after experiencing many difficult years with many humiliating defeats.
Warringah celebrated their inaugural 1st grade premiership win in 2005.
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