He did it two weeks ago following his official visit and made it known to the world at a family party at his house Saturday night.
"We booked the party as soon as we could to get the decision out," Griffin told BadgerNation. "I'm really excited to tell everyone I'm committed to Wisconsin."
Griffin is in the 21st commit in the 2015 recruiting class and is part of a major push by Wisconsin to recruit athletic linebackers into its 3-4 defense. Including Griffin and Brown Deer (WI) athlete Zack Baun, who accepted a grayshirt offer from the Badgers following his unofficial Saturday, Wisconsin currently has six linebackers committed.
The Badgers also continue to aggressive recruit the state of Florida, as Griffin represents the fourth prospect from the state to join Wisconsin after the Badgers signed seven Florida natives last recruiting cycle.
"I am just ready for the competition," said Griffin. "I am one who wants to come in and compete, so I am looking forward to getting up there, getting in film and potentially having the opportunity to play early on."
The 6-0, 210-pound physical linebacker is ranked the No. 44 middle linebacker in the nation and a three star recruit. He committed to Wisconsin over UCF, his other favorite, and also held offers from Boston College, Eastern Kentucky, Cincinnati, Florida Atlantic, Florida International, Georgia Southern, Marshall, South Alabama, South Florida, Tulane, Utah and Western Michigan.
Wisconsin became Griffin's leader during an unofficial visit over the summer, but didn't want to commit until his mother could see the campus. She came with him on his official visit two weekends ago, which was the tipping point for him and his family.
"In the end it was for her being able to see the campus and see where I wanted to be for the next four years," said Griffin. "Coach Andersen and I had a great talk on my official. I could see he was a genuine guy. He's not just someone who is going to tell me what I want to hear. I really respect that and someone I really want to play for."
There have been many things that Griffin lists as positive about Wisconsin, but none more so than defensive coordinator Dave Aranda, who was his lead recruiter throughout the process.
"My relationship with Coach Aranda, him being the defensive coordinator I felt like we really clicked together," said Griffin. "If anybody needs to click, it needs to be me and the defensive coordinator. We had a lot of conversations when I visited on the unofficial. I really enjoyed the campus and the opportunities that he put out there for me, it's going to be wide open coming into my freshman season."