Rules

Rulebooks

• 2026 Adirondack XC Supplemental Rules & Racing Handbook 
  
  
• 2026 International Snowmobile Racing Rules - Cross Country Racing
  

Classes available:

Youth

• Junior 10-13: < 550 fan cooled stock, < 600cc - 50% throttle block, exhaust valves closed per ISR rules.
• Junior 14-17: < 550 fan cooled stock, < 600cc - 50% throttle block per ISR rules.
• Sport Junior 14-17: < 600cc stock w/race director approval.

Trail Classes

• Trail Novice: < 860cc improved stock, < 1100cc naturally aspirated-stroke.
• Trail 650: < 650cc improved stock. 
• Trail 850: < 860cc improved stock. < 1100cc naturally  aspirated 4-stroke
• Trail Open: < 900cc improved stock with or without factory turbo/supercharger. < 1100cc improved stock 4 stroke with or without turbo/supercharger, < 600cc improved stock factory snocross snowmobiles.
• Trail Pro-Am: < 900cc improved stock. < 1100cc improved stock, naturally aspirated 4-stroke. 

Specialty Classes

• Veterans: competitors must be 35 yrs. or greater in age, < 600cc improved stock, < 650cc stock. 
• Masters: competitors must be 50 yrs. or greater in age, < 600cc improved stock, < 650cc stock.
• Ditchbanger Classic 600: 2004 and older snowmobiles, < 600cc improved stock.
• Ditchbanger Classic 800: 2004 and older snowmobiles, < 800cc improved stock, < 1100cc improved stock, naturally aspirated 4-stroke.
• Soo 600:  open to all levels of racers except Pro, < 600cc improved stock, < 650cc stock, < 600cc improved stock factory snocross snowmobiles.
• Factory Snocross: < 600cc improved stock factory snocross snowmobiles. 

Sport

• Sport Women: < 600cc improved stock, < 650cc stock.
• Sport Stock 600: (see ISR rules)
• Sport 600 Improved: (see ISR rules)

Semi-Pro/Pro

• Semi-Pro Factory 600: (see ISR rules)
• Semi-Pro Improved: Stock: (see ISR rules)
• Pro Factory 600: (see ISR rules)
• Pro Open: (see ISR rules) includes < 600 factory snocross snowmobiles.