RunRace USA › Colorado › CEROX + IRON + IRON X
CEROX + IRON + IRON X
Frederick, Colorado · Saturday, September 19, 2026
Official race page & registration ↗CEROX + IRON + IRON X takes place on Saturday, September 19, 2026 in Frederick, Colorado. For anyone travelling in, Denver is about 23 miles away.
It is one of 155 races on the Colorado calendar that September. At $45, entry sits above the $30 median for a Colorado race.
- Date
- Saturday, September 19, 2026
- Location
- Frederick, Colorado
- Entry fee
- from $45
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 Frederick: check in Sep 18, out Sep 20.
Common questions
When is CEROX + IRON + IRON X?
CEROX + IRON + IRON X is scheduled for Saturday, September 19, 2026.
Where is CEROX + IRON + IRON X held?
CEROX + IRON + IRON X is held in Frederick, Colorado. It is about 23 miles from Denver.
How much does CEROX + IRON + IRON X cost?
Entry is listed from $45. Check the official race page for the current price, which usually rises closer to race day.
How do I register for CEROX + IRON + IRON X?
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 Colorado calendar, or use the Race Finder for maps and filters.