Hiltz won the 800 m (2:01.37) at the 2019 Bryan Clay Invitational, won the 1500 m (4:07.71) at the 2019 USATF Distance Classic, runner-up in the 1500 m (4:05.56) at 2019 Portland Track Festival, won the 800 m (2:02.93) at the 2019 Adrian Martinez Classic, won the 1500 m (4:05.97) at the 2019 Sunset Tour. They also placed 3rd in the 1500 m (4:03.55) at the 2019 USA Outdoor Track and Field Championships. Hiltz ranked 19th in the world in the 1500 m with a personal best of 4:01.52 in the semi-finals of the 2019 World Athletics Championships.