Idaho State Outdoor (2025):
In her freshman outdoor season, Isabella Shelton competed in the shot put, hammer throw, and javelin events. At the Big Sky Conference Outdoor Championships (May 14–17), she achieved a personal best in the shot put with a throw of 12.97 meters (42'6.75"), placing 14th. In the hammer throw, she recorded a mark of 43.23 meters (141'10"), finishing 18th. Her top javelin performance was a throw of 27.66 meters (90'9") at the Utah Spring Classic on April 12, where she placed 18th. Earlier in the season, Shelton secured a third-place finish in the hammer throw at the Buc Scoring Meet (March 20–21) with a personal best of 44.68 meters (146'7").

Idaho State Indoor (2024–25):
During the indoor season, Shelton focused on the shot put and weight throw events. She achieved a personal best in the weight throw with a mark of 16.47 meters (54'0.5") at the Mountain States Games (February 14–15), placing sixth. In the shot put, her top performance was a throw of 12.56 meters (41'2.5") at the ISU Winter Open on December 6, 2024, earning her fourth place.

Soda Springs High School: Athletics: Two-sport varsity athlete for four years; Academics: Honor roll and high honors