Kevin Day was named the Wilmington University Women's Lacrosse head coach in October 2017. He began his first season as a collegiate head coach in the spring of 2018.

Kevin Day and the Wilcats have reached the CACC Tournament Semifinals five seasons in a row, including a return trip in 2025. The 13 wins in the 2025 season are the second most in the Day era, with 2024's 14 wins being the most. Day produced his first All-American in 2025, as Ella Royer was named a Third Team USA Lacrosse Division II All-American after breaking the NCAA Division II single-season record with 122 goals. The 7-2 mark in the CACC placed the Wildcats in third overall in the standings in 2025. 

In 2019, Day brought the Wildcats back to the CACC Tournament Semifinals for the first time since 2015, and nearly sprung the upset over No. 2 seed Jefferson. His team went 11-8 overall, going 7-2 in CACC play to finish third in the standings. He was named the CACC Coach of the Year for the first time in his career. He also helped lead four women to be named All-CACC, including the CACC Rookie of the Year in 2019.

Day became the program’s fourth head coach, and joined the collegiate ranks after being a part of the South Eastern Girls Lacrosse Program in Fawn Grove, Pa., for nine years. He started coaching the club program in 2008 while also being the commissioner of the organization for his last six years.

Day also coached at Kennard Dale High School, leading the team to the 2017 PIAA 2A State Championship game. Since becoming a coach at Kennard Dale in 2010, he helped the program to five YAIAA Championships, three PIAA District 3 finals appearances, including the run to the State Final.

He has also created and directed the Mason Dixon Girls’ Lacrosse Camp, coached for the Looney’s Lacrosse Club for nine seasons, and coached at multple camps and clinics in his career..