Teegarden has modeled for campaigns including Old Navy, Tommy Hilfiger, Alltel, Hollister, and YMI jeans. She has made several television appearances including Cold Case, Ned’s Declassified School Survival Guide and Disney Channel’s Hannah Montana.
In 2006, Teegarden joined the cast of the TV series Friday Night Lights, starring Kyle Chandler and Connie Britton. She played Julie Taylor, the eldest daughter of Eric Taylor, a high school head football coach and Tami Taylor, an aspiring high school guidance counsellor. Teegarden held this role until the show ended in 2011.