He is a two-time national champion in the 10000 metres, with victories at the USA Outdoor Track and Field Championships in 2021 and 2023.

While competing for Columbine High School, Kincaid was a state champion in cross country.

Kincaid turned pro in 2016, joining the Bowerman Track Club under coach Jerry Schumacher.

[7] On September 10, 2019, Kincaid became the eighth man in American history to break 13 minutes in the 5000 m, when he ran a time of 12:58.1.

There Kincaid placed third to his Bowerman teammates Marc Scott and Grant Fisher, running a personal best of 27:12.78.

Kincaid rebounded once again the following month, winning the 5000 m title at the NACAC Championships in Freeport, Bahamas.

[7] In 2023, Kincaid left the Bowerman Track Club to move to Flagstaff, Arizona and train under coach Mike Smith.

It’s not really a team thing.”[2] On January 27 at the Boston University John Thomas Terrier Classic, the 30-year-old broke the North American indoor record in the 5000 m with a time of 12:51.61, slicing more than two seconds off Grant Fisher's mark set on the same track in February 2022.