CEROX + IRON
- Date
- July 25, 2026
- Distance
- Cerox Individual · Cerox Teams of 2 · Cerox Iron Individual & more
From the Organizer
Get ready for a functional fitness challenge built for all abilities.
Cerox is back! This time you can choose between Cerox or Cerox Iron.
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.
You can sign up as an individual or with a partner team. Teams can divide the zone work however they choose.
Estimated Wave Time:
11 AM: Cerox Individual
12 PM: Iron Individual
1 PM: Cerox Teams
2 PM: Iron Teams
Get your tickets now and be part of the action on February 28th!
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
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
91°
Typical Low
56°
Chance of Rain
23%
Based on US Climate Normals data from Longmont 2 Ese, 9 mi from the venue.
Host City
About Frederick, CO
Population
15,893
as of 2023
Elevation
5,006 ft
Nearest Airport
DEN
Denver International Airport · 21 mi
Time Zone
Mountain Time
From Endurance Grid
A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at CEROX + IRON, put it on the calendar, and turn “someday” into a start date.
Coming Up
More Running races near Frederick, CO
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the CEROX + IRON?
- CEROX + IRON is a running race held in Frederick, Colorado on July 25, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the CEROX + IRON?
- Saturday, July 25, 2026 in Frederick, Colorado at 3771 Monarch Street, Frederick, CO. Check the event page for exact start times and wave schedules.
- How do I register for the CEROX + IRON?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
CEROX + IRON
Jul 25, 2026