Summit County Clerk's Office records showed Caplan was withdrawn as of May 6.
He will serve out his second term on the Park City Board of Education, which expires at the end of 2024. Caplan represents District 2, which includes parts of Silver Springs, upper Park Meadows and Trailside.
Caplan told KPCW in a statement he decided to run the Friday before the Monday, Jan. 8, filing deadline when no one else had registered for District 2.
"Fortunately, prior to the deadline two more qualified candidates filed, and I believe it is time for new ideas and new enthusiasm for the role," he said.
Caplan also said he was proud of hiring a talented administration, persevering during the COVID-19 pandemic, paying employees living wages and financing new construction throughout the district.
"It has truly been a pleasure to serve on this board with my colleagues," the board president said. "I thank you all for the opportunity."
With Caplan withdrawn, it's down to pediatrician Eileen Gallagher and former Park City Historic Preservation board member Dave McFawn. Both would be first-time school board members.
Two other board seats are on the November's ballot.
In District 1, covering Old Town, Prospector and Park City Heights, incumbent Anne Peters faces retired nurse Susan Goldberg.
In District 3, incumbent Wendy Crossland, former National Ability Center CEO Danny Glasser and child nutritionist Kathleen Britton are running. The third district includes Canyons Village, western Kimball Junction and the rest of Silver Springs.
Utah school board races are non-partisan.
The general election is Nov. 5, 2024.
