Beginning in June 2025, Adidas is the official uniform manufacturer for Utah Celtic FC, and all jerseys, shorts, and socks must be Adidas branded and part of the current uniform lineup.

Uniforms are green and white. No other colors are permitted. Individual teams may not purchase their own kits. Goalkeepers must wear the club's goalkeeper kit and may not wear personalized kits. Shorts, Socks, or any other uniform pieces (not including cleats, shinguards, etc) must be Adidas, and all other brands apparel is prohibited in Utah Celtic FC uniforms.

Temporary shirts may be provided during uniform cycle turnover. These are club approved and should be worn until the official uniform arrives. Teams may not purchase or customize their own kits during uniform cycle turnover.