[3] Hilliard made his professional debut with the Grand Junction Rockies and spent 2016 with the Asheville Tourists, 2017 with the Lancaster JetHawks and 2018 with the Hartford Yard Goats.

[8] He made his debut that night versus Boston Red Sox and recorded his first major league hit, a two-run home run off Josh Smith.

[9] In the pandemic shortened 2020 season, Hilliard hit .210/.272/.438 with an unsightly 36.8% strikeout percentage before being optioned down to the Rockies' alternate site after the club acquired Kevin Pillar.

[13] While on rehab assignment with the Triple–A Gwinnett Stripers,[14] he re–injured his right heel[15] and was transferred to the 60–day injured list on September 1.

His father, Jim Hilliard, played for the Texas Longhorns football team and was an orthopedic surgeon for 35 years.