The fire was reported around 7:12 p.m., according to Battalion Chief Darin White.
A Jeep that had parked directly over or adjacent to a hot Weber grill in Lot A on the 66th Avenue side of the coliseum caught fire, and the fire spread to the vehicles on either side, White said.
All three vehicles were destroyed, and two or three others sustained some damage from the radiant heat, White said.
No injuries were reported.