Tanner Bos is in his first professional season with the ThunderBolts in 2019. He was selected in the second round of the Frontier League draft in 2019. In two years at Midland College, Tanner played in 108 games and hit .335 with 16 home runs, 86 RBIs and 19 stolen bases. He was named Second Team All-GPAC after his junior year in which he hit 13 home runs in 2017. He batted .330 in his lone season with Cuesta College in California. He attended Clovis East High School in Clovis, California.