4 of the 4 go-kart venues Go Karting USA tracks in Utah host birthday parties, based on what each venue publishes and what visitors describe. Most of them cluster around Salt Lake City.
Party bookings work differently from walk-in racing: expect a reserved room or area, a set number of races per guest, and a deposit. Weekend afternoon slots go first, so start calling two to three weeks out — and confirm the height rule for the youngest guests before invitations go out, since it varies venue to venue.
Redline Racing | Utah Go Kart Tracks, Go Kart Center at Utah Motorsports Campus, Go Cart Track at Boondocks and 1 more — all listed below with ratings and locations.
Salt Lake City (2).
Two to three weeks for a weekend slot, more around school holidays. Party rooms and group race slots are reservation-based at essentially every venue, and afternoon weekend times fill first.
Go Karting USA lists 4 operating tracks in Utah — see the full Utah guide for all of them, not only birthday parties venues.