The following vintage classes parallel those used in AHRMA pre-1975 motocross with regard to machine eligibility and other requirements. Except for the Sportsman and Post-Vintage machine-based categories, classes are not further divided by engine displacement.

• Sportsman--88-200cc and 201cc & larger--Novice, Intermediate & Expert.
• Classic--Novice, Intermediate & Expert.
• Premier--Novice, Intermediate & Expert.
• +50--Novice, Intermediate & Expert on any vintage-eligible machine.
• +60--Novice, Intermediate & Expert on any vintage-eligible machine.

AHRMA also offers several post-vintage classes for machines from 1975 to the early 1980s. Motorcycle eligibility follows the post-vintage motocross rules. Classes include:

• Historic--divided into 88-200cc and 201cc & larger--Novice, Intermediate & Expert.
• Post-Vintage--88-200cc and 201cc & larger Gran Prix or Ultima machines--Novice, Intermediate & Expert.
• Post-Vintage +50--Novice, Intermediate & Expert on any Historic or Post-Vintage machine.
• Post-Vintage +60--Novice, Intermediate & Expert on any Historic or Post-Vintage machine.

At most events, separate vintage and post-vintage races are run.

AHRMA recommends that a cross country course not be less than 3 miles in length and that no race run longer than one hour before the first finisher is flagged off. There will be no overall winner, only class winners.

AHRMA 2008 Legends of Cross Country
National Cross Country Series