The Diamond Girls is an organization of juniors and seniors who promote school spirit and good sportsmanship while supporting the varsity baseball team and baseball program. They also represent the Klein Oak Baseball Program by volunteering at charitable events at school and in the community.

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Tryouts are held during the first semester (typically in October). 

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Unfortunately, due to precautions for Covid-19, the Diamond Girls are inactive for the 2020-2021 school year.