Jonathan Castagna’s rise into the Calgary Flames’ prospect pool happened fast, and it came with a contract already lined up for the future. Added in March as part of the MacKenzie Weegar trade with the Utah Mammoth that sent Olli Maatta to Calgary, the Cornell University product signed an entry-level deal by the end of that month. That contract begins in 2026-27, and Castagna also spent time around the Flames before the season wrapped up, taking in a few games in Calgary.
If he had been a little less banged up after his NCAA season, that deal might have started immediately. In that case, the Flames probably would have gotten a look at the centre right away.
Instead, Castagna lands at No. 14 in the Flames’ annual prospect rankings, entering the system with some real momentum behind him. His path to this point started in Ontario, where his early hockey days were local and included a high school overlap in 2021-22 with Aydar Suniev at St.
Andrew’s College. From there, he headed to Cornell and put together a college career that built steadily year by year.
As a freshman, Castagna posted 25 points in 35 games. The next season was quieter offensively, with 15 points in 32 games.
Then came his best year, a junior campaign that turned into a point-per-game season. He wore the alternate captain’s letter and finished with 34 points in 34 games, including 15 goals and 19 assists.
His junior season ended with Cornell losing in regionals on Mar. 27, and just three days later his contract with Calgary was finalized. That set him up for his first season of pro hockey next year.
Castagna also made a strong impression at the Flames’ rookie camp in early July. He stood out there and carried himself with plenty of confidence, something that makes sense given the extra seasoning he brings from the NCAA route. Compared with some of the younger players who had just been drafted, he looked more experienced and more polished.
Cornell sports writer Jane McNally of the Cornell Daily Sun described a player who took a noticeable step forward last season. She said:
Castagna had a breakout year of sorts in 2025-26 (his junior year) after a bit of a sophomore slump - I personally had not viewed him as a potential NHL signee when the season started, and he proved me wrong. He hit career bests in almost all categories, none greater than in faceoff % (65.2% led the entire NCAA).
That’s one of the categories he’s improved upon steadily in his three years at Cornell. He plays a fast, energetic game that has (and will need to continue to) become much more polished and patient, particularly offensively.
But if this season was any indication, he is trending quite positively (and quite fast) in his development. He’s an outstanding skater, a strong leader from what I heard, and someone who consistently wants to get better in all areas.
For 2026-27, Castagna is expected to spend the season with the Wranglers in the AHL. He could still force the issue if the transition to pro hockey comes quickly enough, though there is usually a learning curve. College players often adapt faster than junior players, and Castagna looks like someone who could handle that adjustment well.
Down the middle, he should be a regular centre and has a chance to climb as high as the Wranglers’ first or second line. The competition is real, with Sam Morton, Rory Kerins, Tyson Gross, and Ben Jones also in the mix, but Castagna has a path to 1C if he earns it and holds it.
Even if he starts lower in the lineup, the expectation is that he’ll be a top performer. His familiarity with Aydar Suniev could matter, and there’s a case for a line that includes William Stromgren on the other wing. That group could create a lot of offense, and the skill sets fit together well.
The hope is that Castagna makes a clean jump to the pro game and doesn’t get buried at the bottom of the AHL roster. His speed, hockey IQ, upside, and potential make him one of the more intriguing names in the system, and depending on how this season goes, he could be in the conversation for a Flames spot as soon as next season. That’s a lot to ask of a rookie, but he looks ready for it.
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