Probably in the 1989-1990 offseason.
He released a statement saying: "I remember trying steroids very briefly in the 1989/1990 offseason and then after I was injured in 1993, I used steroids again," McGwire said in his statement. "I used them on occasion throughout the '90s, including during the 1998 season."
See link below for his full statement.
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Mark McGwire debuted on August 22, 1986, playing for the Oakland Athletics at Oakland Coliseum; he played his final game on October 7, 2001, playing for the St. Louis Cardinals at Busch Stadium II.
Mark McGwire played his final regular season game on October 7, 2001. His final postseason game was on October 14, 2001.
1987 for the Oakland Athletics. He was named the American League's Rookie of the Year.
Mark McGwire announced January 11, 2010 that he used steroids for nearly a decade while playing baseball.
According to CNN and AP, Mark McGwire admitted on Jan. 11, 2010, to being on steroids when he broke Roger Maris' home run record in 1998.
1998 Mark McGwire was 6'5" tall, and weighed 250 pounds
Mark McGwire was traded on July 31, 1997 from the Oakland A's to the St. Louis Cardinals.
In 1998, Mark McGwire broke Maris' record by nine home runs. McGwire hit 70 and Maris hit 61.