The class of 2011 prospect is one of the top defensive prospects in that class, and UCLA has been on his radar for a while.
"Jalen got the offer from UCLA after he had a great camp and didn't lose any 1-on-1's," said his father, Jerry.
"I had been wanting this offer and I got it and I'm really excited," Jalen said.
After leaving the camp, Grimble called the UCLA coaches and got the good word.
"Coach (Rick) Neuheisel and Coach (Todd) Howard were the ones who offered me," said Grimble. "The camp was really good. I got to learn a lot from Coach Howard."
Grimble also got a chance to tour the campus while in Westwood.
"The campus was amazing," said Grimble. "It was beautiful. It's in a nice location and I really liked the school and it's academics.
Despite the offer, the timing between now and Signing Day in February of 2011 have put no haste to Grimble's decision-making process.
"My options are wide open right now," said Grimble. "I have no favorites.
"I'm looking forward to getting out there for that one," said Grimble.
As a 2008 sophomore at Bishop Gorman, Grimble had 28 tackles and five sacks