Minnesota native Ryan Lambert attended Minnetonka High School in Minnetonka, Minnesota, where he had impressive sophomore and senior seasons, his junior year lost to the COVID-19 pandemic. He went undrafted after graduating in 2021 and attended Northern Iowa Area Community College. The right-hander appeared in 10 games for the Trojans and posted a 8.53 ERA in 12.2 innings, allowing 17 hits, walking 8, and striking out 27. He played for the Minnesota Mud Puppies of the Northwoods League that summer, but instead of returning to Northern Iowa Area Community College, he transferred to Missouri State University, where he made the varsity baseball team as a walk-on.