Big O Speedway, formerly 85 Speedway, is a 1/4 mile, semi-banked, clay oval dirt track located just east of Ennis, Texas that hosts Saturday night races for classes such as Twister, Jr. Mini, Cruiser, Bomber, Street Stock, IMCA Southern Sport Mod, and IMCA Modifieds, with special events held throughout the season with guest race classes, candy giveaways, bicycle giveaways, wheelbarrow races, tricycle races, an Independence Day fireworks show, and more. Our regular racing season starts in March and continues each week through September with special shows scheduled after the season ends. Gates Open at 6 pm and Races Start at 8 pm (moved to 8:30 at the end of summer).