Molly McCook began her acting career in 2006, where she debuted in Monk. In 2011, she appeared in 10 Things I Hate About You the TV series, Glee and Glamour. Since then she appeared in numerous shows as a supporting role.
From 2016 to 2018, McCook joined The Ranch in a recurring role, playing Darlene.
In 2018, Molly starred as Mandy Baxter in the seventh season of The Last Man Standing. She replaced the former actress, Molly Ephraim, who portrayed the character for six seasons.
- Molly is newly wed to John Krause. They got married in September 2019.