Ole Miss (2021–2022) in 2021.
2021 season In the
2022 Sugar Bowl, Altmyer replaced injured starter
Matt Corral and went 15 for 28 for 174 yards, one touchdown, and two interceptions in a 21–7 loss to
Baylor. He finished the season going 20 for 37 on his passes for 192 yards and a touchdown to two interceptions.
2022 season Altmyer opened the
2022 season against
Troy as the backup to starter
Jaxson Dart, completing one pass for 13 yards in the fourth quarter of the win. He made his first career start in week 2 against
Central Arkansas. Altmyer completed 6-of-13 passes for 90 yards, two touchdowns, and an interception, while also rushing for a touchdown. However, he exited the game early in the second quarter with an injury. After Altmyer's injury, Dart took over the starting job for the rest of the season. Altmyer finished the season completing 8-of-17 passes for 125 yards with two touchdowns and one interception, while also adding a rushing touchdown.
Illinois (2023–present) 2023 season On December 29, 2022, Altmyer transferred to
Illinois. He was announced as the team's starting quarterback for their season opener against
Toledo. In his Illinois debut, Altmyer completed 18-of-26 passes for 206 yards with two touchdowns and an interception while also having nine carries for 69 yards in a 30–28 win. Against
Florida Atlantic, he threw for 303 yards and a touchdown while rushing for a touchdown in the 23–17 win. Against
Minnesota, Altmyer completed 24 passes for 212 yards, three touchdowns, and an interception before getting injured late in fourth quarter. Senior quarterback John Paddock started the final three games of the season for Illinois. In nine games, Altmyer completed 175-of-270 passes for 1,883, 13 touchdowns, and 10 interceptions. He also had 94 rushing attempts for 282 yards and three touchdowns.
2024 season Against No. 22
Nebraska, Altmyer completed 21-of-27 passing attempts for 236 yards and four touchdowns to lead Illinois to a 31–24 overtime win. He became the first Illinois quarterback to throw four touchdowns on the road against a top-25 team since
Kurt Kittner against
Michigan in
1999. Altmyer also lead the Illini to their second 4–0 start since
1951. For his efforts he was named
Big Ten Offensive Player of the Week (shared with
Kaleb Johnson of
Iowa). With the 4–0 start, Altmyer was the only player in the country to throw double digit touchdowns without throwing an interception. He led the Illini to a 9–3 record, with four game-winning drives, the most out of any team in the country. Altmyer ended the regular season with 21 touchdowns and five interceptions, along with four rushing touchdowns. On December 14, while the
Illinois Fighting Illini were hosting the No. 1
Tennessee Volunteers in basketball, Altmyer announced his intention to return to the Illini for the
2025 season. The No. 20 Illini played the No. 15
South Carolina Gamecocks in the
2024 Citrus Bowl, where Altmyer threw for 174 yards, a touchdown, and an interception in a 21–17 victory to give the Illini their first 10 win season since 2001 and first bowl game win since 2011.
2025 season Altmyer was named MVP of the
2025 Music City Bowl.
College statistics ==Professional career==