Gigandet was born in Tacoma, Washington to Jay and Kim Gigandet, along with one sister named Kelsie. In High School, he was a lightly recruited quarterback until he quit the team before his senior season after losing the starting job to an underclassmen. After graduating from Auburn Senior High School in Auburn, Washington in 2001, he moved to California where he attended Santa Monica College, a community college, where he first took an acting class.
Gigandet enjoys basketball, golf, skiing, and surfing, and he is a practitioner of Krav Maga, a self-defense system developed by the Israeli army.
Gigandet and his girlfriend, Dominique Geisendorff, welcomed daughter Everleigh Ray Gigandet on April 14, 2009.
In 2008, Gigandet was honored with several awards, including the "One to Watch" award received at the 10th Annual Young Hollywood Awards. He also shares a MTV Movie Award with co-star Sean Faris for "Best Fight" from the movie Never Back Down. His latest accomplishment is the "Rising Male Star of the Year" award, given to him by Home Entertainment. In 2009 he won his second MTV Movie Award for "Best Fight" from the movie Twilight. He portrayed Hicks in the historial thriller Priest.