Introducing the Trail Monkey Ultra Marathon Grandslam – a biennial event now in its second year! This unique series is the only one of its kind in the Channel Islands, comprising three of Jersey’s most formidable races within a single year. The journey begins in May with the Double Top Ultra, continues in August with Round The Rock, and concludes with the legendary C.I.100k later in the year. The Grandslam covers a total distance of 148 miles and boasts an impressive 21,000 feet of elevation gain.

This challenge is designed to test your mental and physical resilience as you conquer steep inclines, high temperatures, nocturnal running, and strict time constraints. Participants will have the opportunity to witness the stunning beauty of Jersey at various times throughout the year – in May, just before summer sets in; in August, when summer is in full swing; and in November, as the island transitions into winter.

While the Trail Monkey Ultra Marathon Grandslam is not a challenge to be underestimated, its progressive structure allows runners of different experience levels to participate and gradually build their training regimen throughout the year. This series offers a unique opportunity for personal growth and a chance to push the limits of your endurance.

The Grandslam series is only possible biennially, making it an exceptional event in the region. As a testament to their perseverance, all runners who successfully complete all three races within the specified time cutoffs will receive a commemorative buckle, symbolizing their incredible accomplishment.