As a teenager, Fowler spent two seasons with the Youngstown Phantoms of the United States Hockey League (USHL). During the 2021–22 season, he would appear in 18 total games, posting a 11–4–1 record, with a 2.18 goals against average (GAA) and a .927 save percentage. The following season, Fowler played in 40 games, and would lead all USHL goaltenders in wins, GAA and save percentage respectively.[1] During that year's playoffs, he posted an 8–1–0 record, with a 1.36 GAA and .952 save percentage. Fowler then went 3–0–0 in the championship round with a 0.64 GAA, .976 save percentage and a 22-save shutout in the final game to help guide the Phantoms to their first Clark Cup in program history. He was subsequently named the Clark Cup Most Outstanding Player.[2][3] Following an outstanding season, he was named to the All-USHL First team, as well as earning both USHL Goaltender of the Year and Dave Peterson Goalie of the Year distinctions.[4][5]
Fowler began his collegiate career for Boston College for the 2023–24 season.[8] He would start all six games for the Eagles in the month of October, posting a 5–1–0 record which ranked second in Hockey East and sixth nationally with an .833 winning percentage, earning himself Hockey East Goaltender of the Month honors.[9] Fowler subsequently made eight starts for the Eagles in November, and was named Hockey East Goaltender of the Month for the second consecutive month.[10] On November 18, 2023, he recorded his first career NCAA shutout in a game against UConn.[11] Collectively, Fowler finished Hockey East conference play with a 19–3–1 record, ranking first in both wins (19) and save percentage (.925), as well as third in goals against average (2.20), and was named Hockey East Goaltending Champion.[12]