RunRace USA › California › Mammoth Run
Mammoth Run
Moorpark, California · Sunday, October 4, 2026 · 5K, 10K, 1 Mile
Official race page & registration ↗Mammoth Run takes place on Sunday, October 4, 2026 in Moorpark, California. The race offers 3 distances: 5K, 10K, 1 Mile. For anyone travelling in, Simi Valley is about 6 miles away and Oxnard is about 18 miles away.
It is one of 338 races on the California calendar that October. At $35, entry sits above the $28 median for a California 10K.
- Date
- Sunday, October 4, 2026
- Location
- Moorpark, California
- Distances
- 5K, 10K, 1 Mile
- Entry fee
- from $35
Listing from the 2026 race calendar, refreshed nightly. Details can change: confirm date and entry on the official race page before travelling. Spot an error? Tell us here.
Making a race weekend of it?
Stay near the start line in Moorpark: check in Oct 3, out Oct 5.
Common questions
When is Mammoth Run?
Mammoth Run is scheduled for Sunday, October 4, 2026.
Where is Mammoth Run held?
Mammoth Run is held in Moorpark, California. It is about 6 miles from Simi Valley and 18 miles from Oxnard.
What distances does Mammoth Run offer?
The listed distances are 5K, 10K, 1 Mile.
How much does Mammoth Run cost?
Entry is listed from $35. Check the official race page for the current price, which usually rises closer to race day.
How do I register for Mammoth Run?
Registration is handled on the official race page, linked at the top of this listing. Entry can close early if the race sells out.
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See every race on the California calendar, California 5Ks, California 10Ks, or use the Race Finder for maps and filters.