Jackson sank a 3-pointer to give the Wolverines (3-6) the lead for good with 1:03 left and Frey sank all four of his free throws in the final 25 seconds to seal the victory.
Joel Bolomboy led the Wildcats (5-4) with 28 points and 20 rebounds.
In first overtime, Jackson sank a 3-pointer and a Frey hit a layup in the final minute to overcome a 7-point deficit and send the game into its second overtime.
Jackson and Marcel Davis erased a 59-51 Weber State advantage with three 3-pointers in the final 2:09 of regulation, giving the Wolverines a 60-59 edge with 24 seconds left. The Wildcats' Jeremy Senglin sank a free throw in the final 13 seconds to send the game into overtime.