LeMahieu enrolled at Louisiana State University (LSU) to play college baseball for the LSU Tigers.
As a freshman at LSU, for the 2008 season, he started in 67 of 68 games, hit .337 overall, and helped LSU reach the NCAA post-season play for the first time since 2005.
In the post-season, he was selected to the All-Tournament team for the Baton Rouge regional after hitting .300 and scoring seven runs.

In between his only two college baseball seasons, LeMahieu was part of the 2008 Harwich Mariners team in the Cape Cod Baseball League.
He earned the team's regular-season MVP award and was named the No.
6 prospect in the Cape Cod League by Baseball America magazine.
The Mariners won the League Championship Series for the first time in 21 years.

During his sophomore campaign, LeMahieu was selected as a pre-season All American by Collegiate Baseball.
LeMahieu opened the 2009 season with a 9-game hitting streak adding to his previous 16-game consecutive streak from the end of the 2008 campaign, to total hitting safely in 25 consecutive games.
LeMahieu finished the season leading the team in batting average, .350 and total hits, 96.
In Game 1 of the Championship Series, LeMahieu hit a home run in the seventh inning giving LSU the lead temporarily.
Down to their final out in the ninth inning, LeMahieu hit a game tying double off the left field wall.
He then led off the 11th inning with a walk, stole second base with two outs, and scored the game's winning run.
LeMahieu was selected to the 2009 College World Series All-Tournament team, hitting .444 in the series and leading all players with 12 hits.
LeMahieu enrolled at Louisiana State University (LSU) to play college baseball for the LSU Tigers. As a freshman at LSU, for the 2008 season, he started in 67 of 68 games, hit .337 overall, and helped LSU reach the NCAA post-season play for the first time since 2005. In the post-season, he was selected to the All-Tournament team for the Baton Rouge regional after hitting .300 and scoring seven runs.
In between his only two college baseball seasons, LeMahieu was part of the 2008 Harwich Mariners team in the Cape Cod Baseball League. He earned the team's regular-season MVP award and was named the No. 6 prospect in the Cape Cod League by Baseball America magazine. The Mariners won the League Championship Series for the first time in 21 years.
During his sophomore campaign, LeMahieu was selected as a pre-season All American by Collegiate Baseball. LeMahieu opened the 2009 season with a 9-game hitting streak adding to his previous 16-game consecutive streak from the end of the 2008 campaign, to total hitting safely in 25 consecutive games. LeMahieu finished the season leading the team in batting average, .350 and total hits, 96. In Game 1 of the Championship Series, LeMahieu hit a home run in the seventh inning giving LSU the lead temporarily. Down to their final out in the ninth inning, LeMahieu hit a game tying double off the left field wall. He then led off the 11th inning with a walk, stole second base with two outs, and scored the game's winning run. LeMahieu was selected to the 2009 College World Series All-Tournament team, hitting .444 in the series and leading all players with 12 hits.
DJ LeMahieu