America’s ATV National Motocross Series Coming To South Of The Border MX On May 11 by Admin 2 • May 9, 2019 0 Come out to South of the Border Motocross for this exciting event. Adults: $20. Child: $10. Gates open around 7:00 a.m. Practice starts at 8:00 a.m. with races starting around 10:00 a.m. You may bring your own chairs, coolers. umbrella or tent.