[2] After graduating from high school in 1987, Menhart played college baseball, pitching for Western Carolina[2] of the Southern Conference for three seasons.

[1] He was named the Southern Conference Tournament Most Valuable Player in 1989 after he threw a five-hitter with 10 strikeouts in the semifinals versus Appalachian State.

[4] He began his professional career with eight appearances – all starts – for the Class A-Short Season St. Catharines Blue Jays of the New York–Penn League, pitching to a 4.06 earned run average (ERA) over 40 innings, with 38 strikeouts and 19 walks and a record of 0–5.

[5] He then was promoted to the Myrtle Beach Blue Jays of the Class A South Atlantic League, where he pitched to a 3–0 record and a 0.59 ERA in 30+2⁄3 innings over four starts – one of them a complete game – and one relief appearance, striking out 18 and walking five.

[5] Promoted again, Menhart spent the 1991 season with the Class A-Advanced Dunedin Blue Jays of the Florida State League, where he made 20 appearances, all starts, and pitched 128+1⁄3 innings; he finished the year with three complete games, a 10–6 record, a 2.66 ERA, 114 strikeouts, and 34 walks,[5] and was a Florida State League All-Star.

[6][7][8] He underwent ulnar collateral ligament reconstruction,[6] popularly known as "Tommy John surgery," and as a result missed the entire 1994 season.

[7] He made his first major-league start on May 30, facing the Detroit Tigers in Toronto, and struggled, giving up five earned runs before leaving the game in the fifth inning.

[7][9][12] Mussina, however, shut out the Blue Jays with a complete-game four-hitter, and Toronto lost the game 1–0,[7][12] dropping Menhart's record on the season to 1–2.

[9][12] Menhart finished the 1995 season with a record of 1–4 in 21 appearances for Toronto, including nine starts, and an ERA of 4.92 over 78+2⁄3 innings pitched, with 50 strikeouts and 47 walks at the major-league level.

[5] Menhart began the 1997 season with Tacoma, where he made 10 starts and five relief appearances and had a record of 4–7, an ERA of 6.16, and 51 strikeouts and 34 walks in 61+1⁄3 innings pitched.

He started two games and made 47 appearances in relief for the Stars, pitching 64 innings and finishing with an ERA of 5.34, a record of 7–6, and 50 strikeouts and 39 walks.

[5] He spent the rest of the season with the Solano Steelheads, an independent team in the Western Baseball League, where he made 18 appearances – all starts– and had a record of 2–2 and an ERA of 4.09, with 18 strikeouts and seven walks in 22 innings of work.

[16] Unhappy with the work,[16] he returned to Western Carolina University to complete the studies necessary for graduation with a degree in health and physical education.

On March 3, 2021, Menhart was announced as the pitching coach for the West Virginia Power, new members of the Atlantic League of Professional Baseball.