On July 30, 2005, he was then traded to the Seattle Mariners along with catcher Yorvit Torrealba for outfielder Randy Winn. For the rest of the 2005 season, he would pitch for the Mariners Triple A team, the Tacoma Rainiers including 2 starts in the postseason for them. Foppert played in just 5 games for the Rainiers in after spending most of the season on the disabled list. Foppert was released on March 19, from the Mariners after failing to make the club as a nonroster invitee. He rejoined the Giants on March 24, 2007 when he was signed to a minor league contract. Foppert began the season with the Fresno Grizzlies of the Pacific Coast League. He became a free agent at the end of the season and re-signed with the Giants in December. In June , the Giants released Foppert. Foppert resides in Greenbrae with his wife, McKenna (the daughter of former NFL quarterback Craig Morton), and is the head coach at Marin Catholic High School in Kentfield. In the 2012/2013 season, his first as the varsity head coach, Foppert's Wildcats went 15–12. Jesse also runs the Jesse Foppert Pitching Academy which is based in Kentfield.