Chaplin finished the 6,000-meter course in 20:24, edging Georgia Tech's Renee Metivier by seven seconds.
"It feels great. I have been running in this championship since my freshman year. I am so happy for our team, I was even more excited that our team finished fourth," said Chaplin on winning the race. Chaplin won the NCAA West Regional back on Nov. 10 and was named West Region Athlete of the Year by the region's coaches.
The Arizona men finished an inconsistent season with a 21st-place finish at the NCAA Championships. Colorado won the team title with 90 points, edging Stanford by one point for the championship.