Monster Dash - Simi Valley
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Haunted Valley Halloween 5k 10k 15k & Half Marathon
The Haunted Valley Halloween race takes place on October 25, 2026 at Rancho Simi Park in Simi Valley. Participants may run or walk one of four distances offered along the Arroyo Simi Greenway on a mostly flat shared-path course.
Distances:
- 5K : one loop on the marked trail
- 10K : two loops on the marked trail
- 15K : three loops on the marked trail
- Half marathon : three 4.37 mile loops
The course uses out-and-back loops on a shared path; runners and walkers are asked to be courteous to pedestrians, cyclists, and other users. Aid stations are provided at every loop. The half marathon carries a 3:15 time limit.
Registration benefits and event services include a custom Halloween finisher medal, drawstring goodie bag, free photos and videos, live results, on-course snacks and samples, and age group awards available for pick up at the race. Parking at Rancho Simi Park is free with several lots near the course. Volunteer opportunities can provide free race entry for volunteers. The event is organized as a local, in-person race at Rancho Simi Park. Visit the organization's website for the most recent information.
