Throckmorton grew up in Bellevue, Washington and attended Newport High School, where he played both offensive and defensive line for the football team.[1] He was rated a three-star prospect by Rivals, 247Sports, Scout, and ESPN and committed to play college football at Oregon over offers from Arizona, Arizona State, Boise State, Michigan, and Miami.[2]
Throckmorton redshirted his true freshman season. He started all 12 of Oregon's games the following year and was named honorable mention All-Pac-12 Conference.[3][4] He started the first ten games of his redshirt sophomore season at right tackle before moving to right guard for the final three games of the year and was again named honorable mention All-Pac-12.[5][6] As a redshirt junior, Throckmorton was the only FBS player to make a start at four different offensive line positions (right tackle, left tackle, right guard and center) and also played snaps at left guard.[7] He was graded the fourth-best offensive tackle in college football by Pro Football Focus (PFF) and was named a second-team All-American by the FWAA, Phil Steele, and PFF as well as first-team All-Pac-12 by the Associated Press (AP) and honorable mention All-conference by the league's coaches.[8][9]
Throckmorton entered his redshirt senior season on the watchlist for the Outland Trophy and was named a preseason All-American by the AP and PFF.[10][11] He was also named the fifth-best offensive line prospect for the 2020 NFL draft by USA Today.[12] Throckmorton was named honorable mention All-Pac-12 and a third-team All-American by the AP, as well as a second-team Academic All-American, at the end of the season.[13][14]
Throckmorton signed with the New Orleans Saints as an undrafted free agent on April 27, 2020, shortly after the conclusion of the 2020 NFL Draft.[17] He was waived on September 5, 2020, and signed to the practice squad the next day.[18][19] On January 18, 2021, Throckmorton signed a reserve/futures contract with the Saints.[20] Throckmorton made the Saints' 53-man roster out of training camp at the start of the 2021 season. He made his NFL debut in the Saints' season opener against the Green Bay Packers on September 12, 2021.[21] In the game, Throckmorton replaced Cesar Ruiz at right guard while Ruiz took over at center due to Erik McCoy leaving in the first quarter due to a calf injury.[22] He continued being the team's starting right guard for the next four games until Week 7. In Week 8, Throckmorton became the starting left guard after Andrus Peat was placed on injured reserve.[23]
On February 22, 2023, Throckmorton re–signed with the Saints on a one–year contract.[24] On August 29, Throckmorton was waived as part of final roster cuts.[25]
On April 1, 2024, Throckmorton signed with the Denver Broncos.[30] On August 27, the Broncos released him.[31] The next day, he was re-signed to the practice squad.[32] On November 1, he was promoted to the active roster.[33] On November 26, he was waived.[34]