2021–2022 Gelof attended the
University of Virginia, where he was a Media Studies major. All four of his home runs were hit in postseason play. He played in the same
infield with his older brother Zack Gelof as the team advanced to the
2021 College World Series. After the season, Gelof played for the
Kalamazoo Growlers of the wooden bat
Northwoods League, where he batted .370(third in the league)/.445/.597(third) with 10 doubles, 5 home runs, and 21 RBIs in 119 at bats. Gelof moved to third base prior to his sophomore season in 2022. He
hit for the cycle on February 27, 2022, becoming the first Virginia player to do so in 21 years. He was named the
Atlantic Coast Conference (ACC) Player of the Week the following day after going 9-10 during the series with four home runs and 15 RBIs. Midway through the season, Gelof was added to the watchlist for and was a semi-finalist for the
Golden Spikes Award, and the
Dick Howser Trophy presented by the
NCBWA. In his sophomore season in 2022 he set school records with 21 home runs (8th in the conference) and 81 RBIs (2nd in the conference; 6th in the nation), and had a .764
slugging percentage (10th in the nation), while batting .377 (4th) with a .477
on-base percentage (5th) and five
sacrifice flies (6th) in 212 at bats. He also earned Second Team
All-America honors from
ABCA/
Rawlings and Perfect Game, and Third Team All-America honors from NCBWA,
Collegiate Baseball Newspaper,
Baseball America, and D1Baseball.com. before being selected to play for the
United States collegiate national team.
2023 Gelof began his junior year in 2023 being named a Preseason First Team All-American by
Collegiate Baseball Newspaper, NCBWA, and Perfect Game, and a Preseason Second Team All-American by D1Baseball. He was named a Second Team All-American by
Collegiate Baseball Newspaper and NCBWA, a Third Team All-American by Perfect Game, a First Team ABCA All-Atlantic Region selection at third base, and First Team All-ACC at third base for the second straight season. He was ranked #36 by MLB Pipeline ("A right-handed-hitting corner infielder, Gelof does not get cheated at the plate. He has an aggressive approach, looking to do damage and tap into his huge raw power ... but he showed an ability to get to his power in 2022, limit strikeouts, draw walks and make adjustments..."), #37 by
The Athletic, #40 by
Baseball America, #50 by ESPN, and #70 by Perfect Game. ==Professional career==