Monster Dash - Simi Valley
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Haunted Valley Halloween race in Simi Valley
The Haunted Valley 5k, 10k, 15k and Half Marathon takes place at Rancho Simi Park in Simi Valley on October 25, 2026. The course runs along the Arroyo Simi Greenway and uses out-and-back loops on a shared paved trail. The event is an open course; participants are asked to be courteous to pedestrians, runners, and cyclists.
Loops and aid stations are organized as follows: each loop includes an aid station. The 5K, 10K, and 15K follow 1, 2, and 3 loops respectively; the half marathon is three 4.37 mile loops. Parking is free at Rancho Simi Park near the pickleball courts and other park lots.
Registration includes a custom Halloween-themed finisher medal, drawstring goodie bag, free photos and videos, live results, and on-course snacks. Age group awards are available for pickup at the event only and will not be mailed. There is a 3 hour 15 minute time limit for the half marathon. Transfers can be arranged through the organizer and the event has a no refund policy. Visit the organization's website for the most recent information.
