Harpring signed a free agent contract with the Utah Jazz in August 2002. Known as a smart, hard-working player, he fit well in Utah's offensive system, playing alongside superstars Karl Malone and John Stockton. Harpring played the best basketball of his career, averaging 17.6 points per game while shooting 51.1 percent from the floor and 41.3 percent on three-pointers. He set a new career high with 30 points against the Los Angeles Clippers on November 26, 2002. Three nights later, he set another career high with 33 points against the Minnesota Timberwolves (on November 29, 2002). He finished second in voting for the NBA's Most Improved Player in 2002–03 (behind Golden State's Gilbert Arenas).