Riverside Races at Hidden Valley Nature Center — 5k, 10k, 15k & Half Marathon

Hidden Valley Nature Center is one of Riverside's best-loved outdoor spots, and a great place to start or end your year with a run. A Better World Running hosts 5k, 10k, 15k and half marathon races here, with the same easy registration, timing and beautiful custom finisher medals you expect from every ABWR event.​

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Whether you're chasing a new PR or just getting outside with friends and family, our Hidden Valley races welcome every pace, and walkers are always welcome too. Pick your distance, register online, and we'll take care of the rest.

Location: Hidden Valley Nature Center, 11401 Arlington Ave, Riverside, CA 92505

Get directions: https://maps.app.goo.gl/qrkPMUPTZX1NLovt6

Parking: Parking at the Nature Center is $6. Free parking is available across the street in the dirt overflow lot. Please check the signs and instructions where you park.

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Upcoming races -- 5k, 10k, 15k, Half Marathon​​

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• New Year's Eve 12/31/26 Thursday

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2027 dates coming soon!

If you have participated in 5, 7, 10 or 12 locations with us since 2011 - email at abetterworldrunning@gmail.com to get your new Fantastic 5, Super 7, Big 10, or Ultimate 12 medal!  Medals will be available for at race pick up only.