Although born in Texas, Reyes calls Warden, Washington home and played high school baseball there. He graduated from Warden High School in 2006.
Reyes lettered 4 years for coach Dan Caballero. As a senior he was named all-state first team, all-area first team, all-league first team, posted a 6-1 record, 0.32 ERA in 43.2 innings and had 78 strikeouts. As a junior he was named all-state first team, all-area first team, all-league first team with a 9-0 record, 0.40 ERA in 51 innings with 101 strikeouts. Reyes also played American football and basketball.
In 2014 he and his teammates for the El Paso Chihuahuas played a month-long prank on teammate Jeff Francoeur. The prank was that Reyes was deaf. Reyes took long steps to ensure the prank's success, including not listening to music in front of Francoeur and having the catcher sign, (which was most likely not real sign language) while talking to him during mound visits.