Katherine Reynolds concluded a stellar four-year career for Santa Clara University in 2009, exchanging her foundational place with the Broncos for a professional player's life upon leaving the Bay Area school. Nine years, four leagues, and seven teams later, Reynolds has become an integral part of a championship club, establishing herself as an integral part of Portland Thorns FC.
On May 30, 2018, against a North Carolina Courage team that continues the legacy of her first NWSL club – Western New York Flash – Reynolds celebrated her 100th appearance in the National Women's Soccer League.