april, 2025 Diablo Trails Challenge Castle Rock Recreation Area 1700 Castle Rock Road, Walnut Creek, CA 94598 05apr7:00 amDiablo Trails ChallengeCastle Rock Recreation Area Races:10K,50K,5K,Half Marathon Register: Go To Race Site Register Results Diablo Trails Challenge Results 2025 April 5 5K 10K Half Marathon Half Marathon Hiker Division 50K 2024 April 6 5K 10K Half Marathon Half Marathon Hiker Division 50K 2023 April 8 5K 10K Half Marathon Half Marathon Hiker Division 50K 2022 April 9 5K 10K Half Marathon 50K 2019 April 13 5K 10K Half Marathon 50K 2018 April 14 5K 10K Half Marathon 50K 2017 April 15 5K 10K Half Marathon 50K 2016 April 17 5K 10K Half Marathon 50K 2015 April 19 5K 10K Half Marathon 50K 2014 April 11 5K 10K Half Marathon 50K 2013 April 19 5K 10K Half Marathon 50K 2012 April 21 5K 10K Half Marathon 50K 2011 March 19 5K 10K Half Marathon 50K 2010 March 20 5K 10K Half Marathon 50K Go To Diablo Trails Challenge Site Register to Run Diablo Trails Challenge
