[1] He did not sign with the Padres and attended Oregon State University where he played college baseball for the Beavers.

[15] Larnach began 2019 with the Fort Myers Miracle of the High–A Florida State League,[16] earning FSL All-Star honors.

[19] Larnach did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.

[21] Larnach made his MLB debut the next day as the starting left fielder against the Detroit Tigers.

On June 28, 2022, Larnach underwent bilateral surgical repair on a core muscle strain he had suffered days earlier.

His maternal uncle, Brian Cabral, played nine years in the National Football League.