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  • 3771 Monarch Street, Frederick, Colorado, 80516, United States
    OpenStreetMap Google Maps
    Distance: 22.8 km
    Sat, Jul 25, 2026 at 11:00 AM

    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

    See full details
    RunWalk via RunSignup
  • Distance: 21.7 km
    Sun, Aug 02, 2026 at 6:30 AM

    Have you been dreaming of running the Boston Marathon? Need to shave a few minutes off your qualifying time? Or maybe you're just looking for the perfect course to set a new PR? Whether Boston is your goal or not, the Bound for Boston Marathon & Half Marathon is for you.

    We're racing around Northfield High School, and the course is a 1-mile super flat & super fast loop! The Full Marathon is USATF Certified making it a Boston Qualifier!

    This event is uniquely designed for serious runners. We will have water and an electrolyte drink at the aid table. Participants are welcome to bring their own personalized aid to place on the aid tables, allowing you to grab exactly what you need each time you pass. Many runners even bring a cheer crew to help hand out fuel and keep the motivation high throughout the race.

    To maintain the best possible experience, this is intentionally a small, focused event, capped at just 75 participants.

    We will have a great race shirt and finisher medals for all participants. Awards for both distances are in the usual 5-year age groups.

    Fast course, flexible support, and a chance to chase your goals—this is the race that lets you run your perfect day.

    By design this will be a smaller event, focused on getting you your fastest time.

    See full details
    13.1 Miles26.2 MilesHalf MarathonRun via RunSignup
  • Distance: 18.8 km
    Sat, Aug 08, 2026 at 7:00 AM

    Join us for the annual Summer Sizzler 5k/10k/15k! A fun summer event that is perfect for the whole family.

    The fun includes -

    • Great Swag - designer shirt & custom medal

    • Chip-timing with live results and awards

    • Free photos

    • Delicious Treats waiting at the finish line

    • FREE Shaved Ice!

    • Plenty of fun!

    Grab your friends and family, you are not going to want to miss this one!

    Can't make the race? No problem! We offer a virtual race option where you can run anywhere, at any time, and still earn the fun swag!

    *Youth-based pricing for the 5k/10k, 12 & Under are only $17!

    • 5k/10k/15K registration includes a custom bib, designer shirt, and a custom finisher medal!

    • 1 Mile registration is untimed and includes a custom bib, designer shirt, and a custom finisher medal!

    • The kid's dash is a fun, untimed dash for our kiddos ages 10 and under. Registration includes a mini bib, youth-sized shirt, and a specifically crafted medal for our kids' dash event! (If your child wants to run the kid's dash, and doesn't want the SWAG, they are welcome to run with us on race day for free!)

    *Register by midnight on Thursday, two Thursdays before race day, to guarantee your shirt!

    🏁🏅Create a team, or join an existing team during registration. Once 4 people have registered on that team, all team members will be refunded $5, once ten people register another $5 will be refunded for a total of $10!

    See full details
    1 Miles3.1 Miles6.2 MilesRunVirtual via RunSignup
  • Distance: 24.4 km
    Sun, Aug 16, 2026 at 7:00 AM

    Join us for the Erie Half and 5k!

    The Hometown Race Series features half marathons and 5k distance events in outlying communities outside the Denver and Boulder metro areas.

    LOOK UP! At the Erie event, we often see the early morning skies with dotted with delightfully colorful hot-air balloons.

    Whatever distance you're ready to tackle, we'll be there with you to celebrate at the finish line! This is one of the few 5k events where FINISHER MEDALS are awarded to each participant. Go home with proof of your pride and show off that bling!

    See full details
    5k13.1 MilesRun via RunSignup
  • 10600 Westminster Blvd, Westminster, Colorado, 80021, United States
    OpenStreetMap Google Maps
    Distance: 25 km
    Sun, Aug 23, 2026 at 7:30 AM

    Welcome to the Pioneer Prairie Dog Half Marathon event; the one that started the series! With 10k and 5k events too!

    Everyone is back to school and slipping into a routine. Make this your mental health break as you break away from the chaos of weekly schedules and give yourself a morning to race in the crisp autumn air! You'll be glad you took time for YOU!

    5k10k13.1 MilesRun via RunSignup
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