Amateur During the 2010–11 season, Stolarz played with the
New Jersey Hitmen of the
Empire Junior Hockey League (EmJHL). In 16 appearances with the Hitmen, Stolarz posted a 10–4–0 record with a 3.19
goals against average (GAA) and a .902
save percentage (SV%). In 2011, Stolarz wished to serve as the goaltender for the Hitmen's first-level team, a position that had already been given to Chris Funkey. He passed on a chance to serve on the second-level team, instead going to
Albany, New York, to try out for the
Corpus Christi IceRays of the
North American Hockey League (NAHL). Going into the
2012 NHL entry draft, the
NHL Central Scouting Bureau ranked Stolarz fourth among all North American goaltending draft prospects, and he was the only NAHL player invited to the 2012 NHL Draft Combine. The
Philadelphia Flyers selected Stolarz in the second round, 45th overall, of the 2012 draft. After playing only eight games for Omaha, Stolarz dropped out, accepting an offer from the
London Knights of the
Ontario Hockey League (OHL). The January 17 game was Stolarz' 50th regular season appearance with the Knights, and at the time of his injury, he had a career 34–7–4 record with a 2.46 GAA, .923 SV%, and four shutouts. Stolarz underwent surgery for the cut, a procedure which required 55 stitches and required him to miss 17 games. Although he missed most of the playoffs, the OHL waived the final two games of Stolarz' suspension, allowing him to play in the 2014
Memorial Cup. In his two seasons and 55 games with the Knights, Stolarz posted a 38–8–4 record, a 2.43 GAA, and a 0.924 SV%.
Professional Philadelphia Flyers Stolarz signed a three-year
entry-level contract with the Flyers on March 1, 2013. In May 2014, Stolarz received hip surgery, which caused him to miss the Flyers' development camp. Stolarz spent the
2014–15 season with the
Lehigh Valley Phantoms of the
American Hockey League (AHL), going 9–13–14 with a 3.28 GAA and .905 SV% in 31 games. He improved upon these numbers in the
2015–16 season, posting a 21–18–7 record, a 2.60 GAA, and a .916 SV%. On March 2, 2016, Stolarz set a Phantoms franchise record for
saves, stopping 51 shots in a 3–2 shootout win over the
Syracuse Crunch. Stolarz and Lehigh Valley teammate
Nick Cousins also appeared at the 2016
AHL All-Star Classic that January. When
Michal Neuvirth was placed on the
injured reserve with a sprained knee, Stolarz was called up to the Flyers on November 13, 2016. It was his ninth major-league recall in three seasons; at no point in the first eight did he play in an NHL game. Stolarz made his NHL debut on November 27, 2016, in a 5–3 victory over the
Calgary Flames. In doing so, he became the first goaltender born in New Jersey to play in an NHL game. He played seven games with the Flyers in the
2016–17 season, including one
shutout against the
Detroit Red Wings, and posted a 2–1–1 record with a 2.07 GAA and a .928 SV%. In April 2017, Stolarz underwent surgery to repair a
medial collateral ligament tear in his right knee. That June, Stolarz was named as one of eleven Flyers that were protected from the
2017 NHL expansion draft. On July 15, 2017, the Flyers signed Stolarz and fellow goaltender
Alex Lyon to one-year, two way contracts. In September 2017, Stolarz underwent his second knee surgery of the year, repairing a torn left
meniscus. Recovery, as well as a follow-up surgery, kept Stolarz off of the roster for nearly the entire 2017–18 season. He returned for three rehab assignments with the
Reading Royals of the
ECHL and one appearance with the Phantoms. and was re-signed to a one-year, two-way contract as a
restricted free agent on July 18. He spent the bulk of the 2018–19 season with the Phantoms, but after a series of injuries befell Neuvirth, Lyon, and
Brian Elliott, and
Calvin Pickard was traded, Stolarz and rookie
Carter Hart became the Flyers' primary goaltenders by January 2019. On January 29, 2019, Stolarz shut out the
New York Rangers 1–0. In his final game with the Flyers on February 12, 2019, Stolarz made 35 saves in a 5–4 win over the
Minnesota Wild. Stolarz made his team debut on February 27, 2019, replacing starting goaltender
Mikko Koskinen in the second period of a 6–2 loss to the
Toronto Maple Leafs. He made his first start for the team on March 9, 2019, in 3–2 overtime loss against the Maple Leafs when Koskinen came down with the flu. Stolarz became a
free agent at the end of the 2019 season. In a combined 18 games for the Flyers and Oilers in the 2018–19 season, he posted a 4–5–3 record with one shutout, a 3.45 GAA, and a .901 SV%.
Anaheim Ducks On July 3, 2019, the
Anaheim Ducks signed Stolarz out of free agency to a two-year, $1.5 million contract. He had competition for a roster spot, as the Ducks also had veteran goaltenders
John Gibson and
Ryan Miller under contract. Stolarz was assigned to the
San Diego Gulls, the Ducks' AHL affiliate, on September 26, 2019. Stolarz spent most of the
2019–20 season with the Gulls, accumulating a 21–12–5 record, 2.65 GAA, and .922 SV% in 38 games and making an appearance at the
AHL All-Star Classic before being called up to the Ducks on March 1, 2020. Stolarz made his first start for the Ducks on March 11, 2020, in what would be the final regular season game played by the Ducks before the NHL suspended play due to the
COVID-19 pandemic. He made 33 out of 35 saves in a 4–2 loss against the
St. Louis Blues. in 2024 On January 7, 2021, the Ducks signed Stolarz to a two-year contract extension, going through the 2022–23 NHL season. In his second start as a Duck on March 28, 2021, Stolarz stopped 38 shots in a 3–2 overtime victory over the Blues. It was his first NHL win since February 12, 2019. On April 12, Stolarz set a Ducks franchise record for most saves by a goalie in a shutout, stopping 46 pucks in a 4–0 win over the
San Jose Sharks. Stolarz spent much of the shortened 2021 season on the Ducks'
taxi squad. In his eight appearances, he amassed a 4–3–0 record with 2.20 GAA, a .926 SV%, and one shutout.
Florida Panthers Following four seasons within the Ducks organization, Stolarz left as a free agent and was signed to a one-year, $1.1 million contract with the Florida Panthers for the
2023–24 season on July 1, 2023. Stolarz made his NHL playoff debut on June 15, 2024, in game 4 of the
Stanley Cup Final against the Edmonton Oilers.
Toronto Maple Leafs After winning a Stanley Cup with the Panthers, Stolarz left the team as an unrestricted free agent, and signed a two-year, $5 million contract with the
Toronto Maple Leafs on July 1, 2024. On Sept. 29, 2025, Stolarz has agreed to a 4-year, 15 million, $3.75M AAV extension with the Toronto Maple Leafs. ==International play==