Tredwell was born in Marblehead, Massachusetts, but moved to Orange County, California at the age of five. He grew up in Coto de Caza, California attended Mater Dei High School in Santa Ana, California.[1] In Tredwell's freshman season, he pitched in 47 innings, posting a 2.11 ERA, and 62 strikeouts, leading to him being named a consensus Freshman All-American and earning All-Pac 12 honors.[2] In 2022 Tredwell had a bit of a step down pitching a 3.57 ERA and 51 strikeouts against only 12 walks in 45 and 1⁄3 innings. Then in 2023 Tredwell started in nine games, hacing a 3.57 ERA.[3][4]