The new change was set to go into effect on Tuesday.
ITD said it's delaying the speed limit increase so it can review input expressed since the announcement earlier this week of a change to 80 mph.
The board will review the input at a meeting in Coeur d'Alene July 11.
"This will allow a thoughtful and inclusive review, ensuring safety," said Jim Carpenter, ITD chief operations officer.
The speed increased was approved by the Idaho legislature earlier this year.
AAA of Idaho released a statement soon after.
"AAA Idaho applauds the actions of the Idaho Transportation Department to extend a review process before implementing 80-mph speed limits on the rural interstates in southern Idaho. In the interest of public safety, proceeding with caution is the right course of action.
"AAA Idaho recognizes the legislature's authority to enact laws it deems to be in the best interest of Idahoans. Delaying the process to encourage an orderly, well-reasoned transition to the higher 80-mph speed limits is in the best interest of the state and its citizens. In addition, this action may lessen the risks associated with raising the speed limits on hundreds of miles of interstate highways days before the busy July 4 holiday."