After his junior year, he was selected by the
Colorado Rockies in the sixth round, with the 186th overall selection, of the
2018 Major League Baseball draft. Decolati signed with the Rockies and was assigned to the
Grand Junction Rockies of the
Rookie-level Pioneer League. After being a third baseman all through high school and college, the Rockies immediately moved him to right field, where he was subsequently named an All-Star. Over 69 games in Grand Junction, Decolati batted .327 with 11 home runs and 56 RBI. In 2019, he missed time at the beginning of the year after suffering a broken wrist, but returned to play in June with the
Asheville Tourists of the
Single-A South Atlantic League, hitting .265 with six home runs and 38 RBI over 77 appearances. Decolati did not play in a game in 2020 due to the cancellation of the minor league season because of the
COVID-19 pandemic. Decolati was assigned to the
Spokane Indians of the
High-A West for the 2021 season, slashing .264/.341/.402 with 11 home runs, 56 RBI, and 26 stolen bases over 100 games. He spent the 2022 season with the
Hartford Yard Goats of the
Double-A Eastern League but missed time due to injury. Over 44 appearances for Hartford, Decolati slashed .199/.327/.277 with one home run and 17 RBI. He returned to Hartford for the 2023 season, slashing .225/.380/.313 with three home runs, 16 RBI, and 12 stolen bases. In 2024, Decolati played in only 10 games for the rookie-level
Arizona Complex League Rockies, hitting .143/.333/.143 with three RBI and one stolen base. He elected free agency following the season on November 4, 2024. ==References==