The Ontario Ultra Series (O.U.S.) GRAND SLAM challenges seasoned ultra runners to complete all four of the longest races in the Series within the calendar year. Few are expected to rise to the challenge and even fewer are expected to realize the goal. By its very nature, the GRAND SLAM will push both physical and mental boundaries, recognizing and rewarding those that complete it. New in 2014 is the Petit SLAM.

GRAND SLAM Rules

NEW Rules starting in 2014:

For rules for the new Petit SLAM click here.
  1. You must declare your intent to participate in the O.U.S. SLAM before the start of Sulphur Springs 100 mile Trail Race.
  2. The form and a fee of $50 must be mailed to Dirty Runner, P.O. Box 23043, 125 Carlton St. St. Catharines, ON L2R 1R5.  Your envelope must be postmarked the day before the Sulphur Springs race.
  3. Cheques must be made payable to Dirty Runner Productions
  4. The fee is non-refundable
  5. Successful SLAMMERS will be recognized after the last race in the SLAM.
  6. To successfully complete the SLAM, a runner must complete, as per the rules of the respective races  the following four races:
  • Sulphur Springs 100 miles
  • dirty girls 48 hours (100 miles)
  • Haliburton 100 miles
  • Ottawa 24 hours (100 miles)

    All races are part of the Ontario Ultra Series.