Who is Quinn Costello? Medford’s Newman School Star Set to Play in McDonald’s All-American Game
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Massachusetts high school basketball has another national name to know, and it’s Quinn Costello.
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The Medford native and Newman School senior has gone from intriguing local prospect to one of the top players in the country, earning a spot in the 2026 McDonald’s All-American Game. ESPN currently lists Costello as the No. 28 player in the class of 2026 and the No. 1 prospect in Massachusetts, while also noting he’s signed with Michigan.
That makes Costello more than just a good local story. It puts him on one of the biggest stages in high school basketball, with a place on the Boys West roster for Tuesday night’s game in Glendale, Arizona. For fans around Boston and beyond, this is the kind of rise that grabs your attention fast.
Quick facts on Quinn Costello
- Hometown: Medford, Mass.
- School: The Newman School in Boston.
- College: Signed with Michigan.
- McDonald’s All-American team: Boys West, jersey No. 8.
- Other major honor: Named to the Jersey Mike’s Naismith Boys High School Player of the Year Midseason Team.
Why Costello’s rise has been such a big deal
Costello’s breakout didn’t come out of nowhere, but it definitely accelerated in a hurry. Michigan’s official release on his McDonald’s All-American selection said he surged during the summer of 2025 with the Middlesex Magic on the Under Armour circuit, where he averaged 11.0 points and 5.0 rebounds per game, then followed that with a standout showing at Pangos All-American Camp and co-Most Outstanding Player honors. By his senior season at Newman, he was putting up 16.4 points, 8.1 rebounds, 2.0 assists and 1.1 steals per game.
He’s also been doing it for a program that keeps winning. Newman captured the NEBL championship in February and then rolled to the NEPSAC AAA title in March, beating Hoosac 101-68 in the final. That only added to the buzz around a player who was already climbing fast nationally.
New England Basketball Journal noted that Costello’s selection continues a recent run of New England stars making the McDonald’s game, following names like Cooper Flagg and AJ Dybantsa. So this isn’t just a Newman story or a Medford story. It’s another reminder that elite prep basketball talent keeps coming out of this region.
What kind of player is Quinn Costello?
The easiest way to put it: Costello looks like a modern frontcourt prospect. ESPN lists him as a center, but recruiting evaluations have pointed to the skill set of a stretch forward — a player with size who can space the floor, shoot with touch and keep developing into a matchup problem. 247Sports describes him as a “budding stretch-four” with soft touch and shot-making ability, while also noting his continued growth physically and skill-wise.
That’s a big reason his recruitment blew up and why Michigan got a major win when it landed him. The bigger picture is simple: a kid from Medford, playing at Newman in Boston, is now on the McDonald’s All-American stage. That’s not normal. That’s a sign you’re looking at one of the biggest Massachusetts high school basketball stories of the year.