New Year's Eve Half Marathon - Hidden Valley
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New Year's Eve 5K, 10K, 15K and Half Marathon : Hidden Valley, Riverside
This event on December 31, 2026 takes place at Hidden Valley Nature Center, 11401 Arlington Ave, Riverside, CA. Distances offered are listed below and the course uses the Santa Ana River Trail.
- 5K
- 10K
- 15K
- Half marathon
The course is an open, shared-use path with marked out-and-back loops. Each loop begins with a 1.2 mile out and 1.2 mile return (2.4 miles) from the start/finish, then continues east on the trail. The 5K is one loop, the 10K is two loops, and the 15K is three loops. The half marathon consists of three loops of roughly 4.4 miles each. Turnarounds are marked with cones, chalk and signs for each distance.
On-course and event amenities include a turnaround aid station with water cups, water bottles, Gatorade cups and GU gels, park restrooms and portable restrooms near the start/finish (these are the only restrooms on course), chip timing, live results, free race photos and videos, a custom finisher medal and a drawstring goodie bag for each registrant.
Additional notes: running or walking with a stroller is allowed. Parking at the Nature Center has a $6 fee with a free overflow lot across the street. Race day registration fees are $35 for the 5K, $40 for the 10K, $45 for the 15K and $50 for the half marathon. There are no refunds; transfers and group registrations are handled by the organizer. The half marathon has a 3 hour 30 minute time limit. Visit the organization's website for the most recent information.
