Wishnowsky was an Australian Rules Football player in Perth growing up but had to give up that sport due to a chronic shoulder injury. He took up American football and caught the eye of Utah head coach Kyle Whittingham. Wishnowsky did have to attend a junior college for one year before enrolling at Utah, so he played at Santa Barbara (Calif.) Community College in 2014 (39.8 yards per punt, 30 of 63 inside the 20-yard line). He did not play football in 2015, but then came on like gangbusters the following fall. He won the 2016 Ray Guy Award as the nation's top punter and earned consensus All-American and first-team All-Pac-12 honors after leading the FBS in net punting (44.63 yard-average) and 50-plus yard punts (30 of 64). He ranked second nationally with a gross average of 47.7 yards per kick. Wishnowsky was a third-team Associated Press All-American, first-team All-Pac-12, and finalist for the Ray Guy Award in 2017, ranking sixth in the country with a 43.9-yard gross average. He also took over kickoff duties in 2017 (44 touchbacks on 65 kickoffs) and used his Aussie Rules Football tackling skills five times on coverage that year. In 2018, he was named AP second-team All-American. He did not kick off for the Utes in his senior season, but his punting was once again outstanding as he landed Associated Press second-team All-American and first-team All-Pac-12 honors. Wishnowsky finished 10th in the FBS with a 45.2-yard per punt gross average. He forced 25 fair catches on his 59 punts, placing 24 kicks inside the 20, but also saw three of his kicks blocked.