Red Sox sign 6-foot-7 righty Harrison Blum to minor league contract

FORT MYERS, Fla. — The Boston Red Sox have added a towering new arm to their system, agreeing to terms on a minor-league deal with undrafted free-agent right-hander Harrison Blum, the club confirmed via SoxProspects.com’s Andrew Parker.

Blum, 24, spent six seasons in college baseball, beginning at Division III Luther College in Decorah, Iowa, where he earned back-to-back American Rivers Conference first-team honors in 2023 and 2024. The Minnesota native capped his collegiate journey in 2025 as a graduate transfer at Division II Augustana College in Sioux Falls, S.D.

Working predominantly out of the Vikings bullpen last spring, Blum logged 50 innings across 17 appearances (three starts), striking out 48, walking 22 and collecting four saves. Opponents hit .269 against him while he posted a 4.50 ERA.

Standing 6-foot-7 and 240 pounds, Blum fits the profile the Red Sox have pursued under chief baseball officer Craig Breslow. His fastball has jumped from 91 mph on average last season to 96-97 mph this winter, and he complements the heater with a curveball and a splitter.

Blum showcased his improved stuff at DST Arizona’s pro day in Phoenix last month, drawing enough attention from Boston’s evaluators to secure his first professional contract.

“I am excited for another opportunity to continue to push myself further in this game we all love,” Blum said in a statement released by Luther College on Tuesday. “There is a ton of talent within the Red Sox organization, and I’m looking forward to being a part of this historical franchise.”

Luther head coach Bryan Nikkel calls Blum a “late bloomer,” while Augustana head coach Tim Huber believes the righty still has “more in the tank.” Blum is expected to report to the Red Sox spring-training complex in Fort Myers shortly and open the season at either Low-A Salem or High-A Greenville.