Fortenberry announced the offer from the Cyclones on his Twitter page earlier today.
The offer from Iowa State is the third for the talented corner, joining the two he already had from Hawaii and Western Kentucky.
As a freshman last season, Fortenberry had a team-leading seven interceptions and 20 pass breakups while also posting 48 tackles.
He is set to finish up his academic work in December and he will have three years to play two following the 2016 football season.
Deante Fortenberry Scout Profile