[3] On August 2, 2018, Penrod signed with the Texas Rangers as an undrafted free agent, after he was not selected in the 2018 MLB draft.
[2] He made his professional debut with the rookie-level Arizona League Rangers, recording a 6.17 ERA with 11 strikeouts over 4 games.
[6] In his first competitive baseball since 2018, Penrod started 14 games for Boise, with a 3–4 record, 5.66 ERA, and 85 strikeouts across 68+1⁄3 innings of work.
[7] On August 23, 2022, Penrod, Byron Smith, and Juan Teixiera were traded to the Billings Mustangs of the Pioneer League.
[13] Penrod began the 2024 campaign with the Double-A Portland Sea Dogs before being promoted to the Triple-A Worcester Red Sox in late May.
[16] He made his MLB debut the same day, pitching in relief at Yankee Stadium and striking out the first two batters he faced.