Cerox + Iron + Iron X
Cerox + Iron + Iron X logo

Cerox + Iron + Iron X

Frederick, Colorado, United States View on map
Sep 19, 2026 (America/Denver local time)
Running

About this race

Get ready for a functional fitness challenge built for all abilities.

You’ll take on 8 fitness zones designed to test your endurance, strength, and grit. Choose your level of challenge:

Cerox: The event will feature 8 fitness zones plus running.\

Cerox Iron:  The same zones as the classic Cerox event, but without the running.

Cerox Iron X: Twice the grind, none of the miles. Double the reps, double the work.

You can sign up as an individual or with a partner team. Teams can divide the zone work however they choose.

Cerox Workout:
400M Run
Zone 1: 400M Row Erg

400M Run
Zone 2: 30 Deadlifts - 155/105

400M Run
Zone 3: 400M Ski Erg

400M Run
Zone 4: 20 Sandbag Over 4' Bar - 100/70

400M Run
Zone 5: 75M Walking Lunges - RAM 55/33

400M Run
Zone 6: 200M Farmers Carry - 2x 60's/ 40's

400M Run
Zone 7: 30 Cal. Echo Bike

400M Run
Zone 8: 30 Burpees to Plate

Cerox Iron Workout:

Zone 1: 400M Row Erg

Zone 2: 30 Deadlifts - 155/105

Zone 3: 400M Ski Erg

Zone 4: 20 Sandbag Over 4' Bar - 100/70

Zone 5: 75M Walking Lunges - RAM 55/33

Zone 6: 200M Farmers Carry - 2x 60's/ 40's

Zone 7: 30 Cal. Echo Bike

Zone 8: 30 Burpees to Plate

Cerox Iron X Workout:

Zone 1: 800M Row Erg

Zone 2: 60 Deadlifts - 155/105

Zone 3: 800M Ski Erg

Zone 4: 40 Sandbag Over 4' Bar - 100/70

Zone 5: 150M Walking Lunges - RAM 55/33

Zone 6: 400M Farmers Carry - 2x 60's/ 40's

Zone 7: 60 Cal. Echo Bike

Zone 8: 60 Burpees to Plate

Pick your distance

Running

Cerox Individual

Sep 19, 2026 Cerox Individual 9:00 AM
$55.00
Open

Cerox Iron Individual

The event will feature 8 fitness zones no running, designed to test your endurance, strength, and grit.

Sep 19, 2026 Cerox Iron Individual 9:00 AM
$50.00
Open

Cerox Iron Teams of 2

Sep 19, 2026 Cerox Iron Teams of 2 9:00 AM
$45.00
Open

Cerox Iron X Individual

Sep 19, 2026 Cerox Iron X Individual 9:00 AM
$55.00
Open

Cerox Iron X Teams of 2

Sep 19, 2026 Cerox Iron X Teams of 2 9:00 AM
$50.00
Open

Cerox Teams of 2

Sep 19, 2026 Cerox Teams of 2 9:00 AM
$50.00
Open

Course

Route map and elevation profile

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

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Other races near Frederick

Different organizers, within 40 miles, in the next three months

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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 5 Frederick events

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