FC Hasental was established in 2005, as an amateur club, based in the Conejo Valley of Southern California. The founders agreed on the name "Football Club Hasental" in honor of their European roots. Hasental translates from German to English as Hare-Valley, also known as Conejo Valley. FC Hasental was founded by Gerd Kleemann, Eric Warner, Justin Carpenter, and Robbert-Jan Matthee.
FC Hasental began playing in the USASA-affiliated La Gran Liga de Oxnard in 2005/06, where they lost to Royal Puma FC in the Semi Finals. The following year they finished the season in second position, losing in the first round of the playoffs to CFA United. In the 2007/08 season Hasental entered the Tri-County Soccer League (TCSL) , where they won the league cup with a 5-1 Victory over CSC76 Wanderers (Rovers). The following season Hasental introduced their reserve team, who won the TCSL League Championship, beating cup holders Crown & Anchor Lions with a 1-1 draw in May 2009.
FC Hasental's reserve team won the TCSL Charity Shield in 2009/10, but relinquished their hold of the League Cup. The club entered the Lamar Hunt US Open Cup in 2009 and 2010, through the Region IV USASA qualification tournament, but failed to qualify on both occasions.