[1] As a freshman in 2016, Gilbert appeared in 21 games with five starts, going 2–1 with a 2.74 earned run average (ERA) and 43 strikeouts in 49 innings.

After his freshman season, he pitched for the Bethesda Big Train in the Cal Ripken Collegiate Baseball League, posting a 1.70 ERA with 28 strikeouts over 26+1⁄3 innings.

[2] As a sophomore in 2017, he appeared in 15 games with 12 starts, and went 10–0 with a 2.02 ERA and 107 strikeouts in 89 innings and was named the ASUN Conference Pitcher of the Year.

[13] Gilbert made his minor league debut as the 2019 Opening Day starter of the West Virginia Power.

[18] Gilbert did not play in an official game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.

[23] On May 13, Gilbert was promoted to the major leagues and made his debut as the Mariners starting pitcher against the Cleveland Indians.

He gave up the third-highest percentage of line drives in the majors (28.9%), and balls hit against him had the second-highest average exit velocity (91 mph) among all pitchers.

[32] Gilbert pitched his first career shutout on July 4, striking out 7 San Francisco Giants and allowing 5 hits.

[33][34] That game and a subsequent win over the Houston Astros earned him the AL Pitcher of the Week award.