Castle Rock Trail Festival
Castle Rock, United States • 4 Oct 2025
Event overview
The Castle Rock Trail Festival / liveBIG Run is a trail running and walking event on the Ridgeline trail system in Castle Rock, using Philip S. Miller Park and Ridgeline Open Space. The event includes a family obstacle run for children ages 5 to 12 and longer trail races for adult participants. Participants receive an event T-shirt and finisher’s medal. Professional chip timing is used and free event photos are provided after the race. Post-race refreshments and finish-line beverages are available.
Race details and logistics
Distances offered:
- liveBIG Family Adventure Run
- Philip S. Miller 5K
- Ridgeline 10K
- Ridgeline Trail Half Marathon
- Ridgeline 50K
Standard registration fees listed on the event page are $20 for the Family Adventure Run, $35 for the 5K, $45 for the 10K, $65 for the half marathon and $95 for the 50K; taxes and processing fees are additional. Online registration closes Sunday, Sept. 28; race-day registration is available with a fee increase for all races except the Family Adventure Run. The 50K ultramarathon has an 8-hour time limit. Aid stations will provide bottled water and basic first aid; selected aid stations for the 50K will also offer electrolytes. A 10-foot by 10-foot tent near the second loop start is available for drop bags during the 50K. Awards are given overall and by age group for races 5K and up. Average early October temperatures noted are lows near 35 degrees and highs near 65 degrees. Wildlife may be present on the trails. Visit the organization's website for the most recent information.