[1] He made his professional debut in 2015 with the Dominican Summer League Cardinals where he hit .252 with three home runs and 30 RBIs in 57 games.

[2] After slashing .321/.381/.529 with 15 home runs, 69 RBIs, and 28 doubles in 102 games, he was promoted to the Palm Beach Cardinals in August.

[10] On February 1, 2021, Montero was traded to the Colorado Rockies along with Austin Gomber, Mateo Gil, Tony Locey, and Jake Sommers in exchange for Nolan Arenado.

[15] On April 29, 2022, Montero was recalled and promoted to the major leagues for the first time after Kris Bryant was placed on the injured list.

[16] On August 6, Montero hit his first career home run, a solo shot off of Arizona Diamondbacks starter Merrill Kelly.

[18] Montero played in 61 games for Colorado in 2024, batting .206/.268/.305 with four home runs, 28 RBI and a -1.6 Wins Above Replacement.