2023 National Classes
| CLASS | CLASS NAME | MACHINE REQUIREMENTS | AREA QUALIFIER RACE DAY |
| Attend Amateur Regional | |||
| 1 | Open Pro Sport | 122-Open cc | Sunday |
| 2 | 250 Pro Sport | 122-250cc | Saturday |
| 3 | WMX | 122-250cc | Saturday |
| Must be 14 to race 250cc | |||
| Min. Wheels: Front 21"; Rear 18" | |||
| 4 | 250 B | 122-250cc | Sunday |
| 5 | 250 B Limited | 122-250cc | Saturday |
| 6 | 250 C | 122-250cc | Sunday |
| 7 | 250 C Limited | 122-250cc | Saturday |
| 8 | 250 C Jr (12-17) Limited | 122-250cc | Saturday |
| Must be 14 to race 250cc | |||
| 9 | 450 B | 122-Open cc | Sunday |
| 10 | 450 B Limited | 122-Open cc | Saturday |
| 11 | 450 C | 122-Open cc | Sunday |
| 12 | 125 C | 122-125cc | Saturday |
| 13* | Schoolboy 2 (12-17) B/C | 122-250cc | Sunday |
| Must be 14 to race 250cc | |||
| 14** | College (18-24) (Sportsman) | 122-Open cc | Sunday |
| 15 | Junior (25+) | 122-Open cc | Sunday |
| 16** | Vet (30+) (Sportsman) | 122-Open cc | Sunday |
| 17 | Senior (40+) | 122-Open cc | Sunday |
| 18** | Senior (45+) (Sportsman) | 122-Open cc | Sunday |
| 19 | Masters (50+) | 122-Open cc | Sunday |
| Attend Youth Regional | |||
| 20*** | Micro-E (4-7) Limited | 1kWh Battery Energy | Saturday |
| 21*** | Micro 1 (4-6) Shaft Drive Limited | 0-51cc 2-Stroke | Saturday |
| 22*** | Micro 2 (4-6) Limited | 0-51cc | Saturday |
| 23*** | Micro 3 (7-8) Limited | 0-51cc | Saturday |
| 24 | 65cc (7-9) Limited | 59-65cc | Saturday |
| 25 | 65cc (7-9) | 59-65cc | Sunday |
| 26 | 65cc (10-11) Limited | 59-65cc | Saturday |
| 27 | 65cc (10-11) | 59-65cc | Sunday |
| 28 | 85cc (10-12) Limited | 79-85cc | Saturday |
| 29 | 85cc (10-12) | 79-85cc | Sunday |
| 30 | Mini Sr 1 (12-14) | 79-85cc 2-Stroke/75-150cc 4-Stroke | Saturday |
| Max. Wheels: Front 17"; Rear 16" | |||
| Max. Wheelbase: 51" | |||
| 31 | Mini Sr 2 (13-15) | 79-85cc 2-Stroke/75-150cc 4-Stroke | Sunday |
| Max. Wheels: Front 17"; Rear 16" | |||
| Max. Wheelbase: 51" | |||
| 32 | Supermini 1 (12-15) | 79-112cc 2-Stroke/75-150cc 4-Stroke | Saturday |
| Max. Wheels: Front 19"; Rear 16" | |||
| 33 | Supermini 2 (13-16) | 79-112cc 2-Stroke/75-150cc 4-Stroke | Sunday |
| Max. Wheels: Front 19"; Rear 16" | |||
| 34 | 125 Jr (12-17) B/C | 122-125cc 2-Stroke | Sunday |
| 35 | Schoolboy 1 (12-17) B/C | 86-125cc 2-Stroke/75-150cc 4-Stroke | Saturday |
| Min. Wheels: Front 19"; Rear 16" | |||
| 36 | Girls (11-16) | 79-112cc 2-Stroke/75-150cc 4-Stroke | Saturday |
| Max. Wheels: Front 19"; Rear 16" | |||
| Must be 12 to ride Supermini | |||
| * Youth age rules apply. | |||
| ** Sportsman: Pro license restrictions apply. See Supplemental Rules for details. | |||
| *** Racers may attempt to qualify in more than one class, but may only enter one Micro class at the National. | |||