[4] Castro was a junior majoring in Construction Science at Texas A&M University in College Station on a full academic scholarship when he auditioned for American Idol.

[9] He has stated that his musical influences include Ray LaMontagne, Ben Harper, Bob Marley, Carlos Vives and Kirk Baxley.

[10] Castro auditioned for American Idol in Dallas, Texas, singing the Ray LaMontagne version of the song "Crazy".

[16] According to the March 22, 2008, issue of Billboard, this was the highest boost in digital sales a song had ever received after being performed by a contestant on American Idol.

Jason Castro's rendition of the song propelled Jeff Buckley's version to be certified gold and platinum as a single on April 22, 2008.

Castro performed the full version of "Hallelujah" at the world premiere of Amar A Morir on January 23 at the Santa Barbara International Film Festival.

[26] Fellow Atlantic Records artist Serena Ryder appears with Castro on a duet titled "You Can Always Come Home".

[29] On August 18, 2009, Castro performed his new single "Let's Just Fall in Love Again" on a live video webchat from his website, as well another song titled "It Matters to Me".

Castro's label, Atlantic Records, released presales of the album and offered the single as a free download to buyers.

Castro completed a tour with Matt Hires and Caitlin Crosby and traveled to Malaysia, Singapore and the Philippines to promote his EP and album.

He then toured a second time with band Camera Can't Lie and his younger brother Michael as his opening acts to promote his album.

[citation needed] Castro has released covers on iTunes with his two younger siblings, Michael and Jackie, both of whom are also singer-songwriters.

The three siblings also formed a group called Castro, and in May 2015 they released their first music video for the original song "Rock and Roll".

After the band broke up, Castro returned to Dallas and began work as real estate agent with Coldwell Banker Residential Brokerage.

[45] On December 13, 2008, Castro performed alongside Patti LaBelle for a Christmas concert in Garland, Texas, benefiting the Best Education Foundation, an organization that supports the city's school district.