Bigger than big. The MCM50K is the largest ultramarathon in the country and the only one held entirely in an urban setting. Participants share the start line with the Marine Corps Marathon in Arlington, VA directly adjacent to the Pentagon. The MCM50K begins prior to the MCM on October 30, 2022 and runs the entire MCM course with a 4.87-mile diversion at Mile 4.5 after runners cross the Key Bridge from Virginia into the nation’s capital. In addition to providing an official finish time, the MCM collects timing data for 50K runners at the 26.2 mile mark along the 50K course that can be used as a qualifying marathon finish time.

General Registration

MCM50K general registration is now open for runners aged 18 and older.

Click Here To Register

Virtual Registration

Back by popular demand, a limited number of virtual entries will open simultaneously with the live and in-person registration. Participants will have from October 1 to November 10 to complete their distance.

A virtual finish will not count toward MCM Runners Club or the Semper Fidelis Challenge.

Participant Bib

Registered virtual runners may download a personal participant bib to wear or display. Bibs are now available.

To Download your Virtual Bib:

  • Log into your Participant Account (username is your email)
  • Click “Your Registrations”
  • Click on your MCM50K registration
  • Click “Download Your Virtual Bib"

Connect a wearable

Participants have the option to link their personal wearables to their account to track their mileage and submit results. This should be done prior to starting your virtual event. Log into your participant account to view wearable options.

To sync your wearable:

  • Connect your wearable device.
  • Click on “Your devices” at the top of the screen and click "Connect" under your device.
  • Follow the steps to connect.
  • You will be prompted to log into your wearable device

Submitting Results

Runners are encouraged to submit their results through participant account in Haku.

Results may be submitted via a link to a public page from an app, a screenshot, a photo of a watch or treadmill or directly from a supported wearable device. Ensure to record both distance and time in your submission. Participants have from October 1 to November 10, 2022 to input their finisher data.

To submit results manually:

  • Log into Participant Account
  • Click “Your Registrations”
  • Click on the specific event registration
  • Scroll to the bottom of registration information
  • Enter total finish time, distance completed and additional information.
  • Enter proof of finish time via link or photo (optional)
  • Click “Save” to complete your submission

To submit results from synced device:

  • Log into Participant Account
  • Click “Your Registrations.”
  • Select the event you are submitting time for
  • Click “Submit Activity” and “Log New Activity.”
  • Select “Add From Wearable.”
  • The data from your device will be displayed
  • Click “Select” to choose an activity to submit as your results.

Finisher Certificates

To download your virtual finisher certificate:

  • Log into Participant Account
  • Click “Your Registrations”
  • On the right side, click on "See Your Finisher Details"
  • Click on "View Your Results"
  • Click on "Download Finisher Certificate"


Deferments are allowed for the MCM and MCM50K only. To defer:

  • Go to https://manage.hakuapp.com/login/marine-corps and login to your participant account
  • Once logged in, click on “Your Registrations” at the top of the page
  • On the right side of the tile for your registration, click on “View Registration"
  • At the bottom, click on the grey button labeled “Registration Options,” then click on “Defer for Future”
  • Click "Defer and Pay" to confirm your deferment

*See your deferment confirmation email for instructions on how to claim your deferment next year.

Refundable Registration

Participants who are concerned they may not be able to participate in a Marine Corps Marathon Organization event can pay an additional service fee (12% of all items purchased, excluding event processing fees) for a 100% refund. The service fee will be the only amount not refunded. Refundable registration must be purchased as part of the registration process. Participants cannot go back and purchase once registration is complete.

For more information on the perils covered by refundable registration visit: https://refundable.me/haku/.

Please note, refundable registration does not cover the following:

  • If the participant does not attend the event because they are concerned about the coronavirus (COVID-19) or are self-isolating without a positive COVID-19 test or other non-COVID-19 communicable diseases leading to quarantines or travel restrictions.
  • If event organizers cancel the race.
  • Processing fees associated with items (entry fee, ancillary products, etc.) purchased during the application process.


Ambitious runners can register for three MCM Weekend events through a combination of virtual or live MCM, MCM50K and MCM10K to complete the Trifecta. This challenge will reward finishers with a stunning challenge coin in addition to the corresponding finisher medals.

In order to achieve the Trifecta, runners must run either the MCM or MCM50K live and the other two events can be virtual.

Registration for the virtual MCM and MCM50K events is now open. MCM10K registration will open on April 6.

Brooks MCM In-Training Gear

Shop the Brooks line of MCM In-Training gear, available for purchase on the Brooks website. Whether it's your first MCM or you're a veteran of "the People's Marathon," choose from officially licensed caps, T-shirts and tanks that motivate you while training for the 47th MCM!

Shop Now!

Pace Team

The MCM welcomes the Marathon Maniacs Pace Team to provide the valuable service of guiding runners to the finish with a specific time goal. There will be two pacers for the following times: 4:30, 5:00, 5:30, 6:00 and 6:30.

Marathon Maniacs is a club for runners who are crazy about running marathons and are ready to take it to the next level. We aren’t your typical running club, you must first qualify to join the insanity! 3 marathons in 90 days or 2 within 16 days to qualify. Do you have what it takes?! Visit www.marathonmaniacs.com.

Finish Line

The MCM50K shares the finish line with the MCM. Adjacent to the U.S. Marine Corps War Memorial, runners will pass under the famed MCM arch to receive a finisher medal from an awaiting Marine Corps lieutenant.

RRCA Championship

The Road Runners Club of America (RRCA) has awarded the Eastern Region Ultra Championship to the MCM50K for 2022. The 50-kilometer run will take place during the Marine Corps Marathon (MCM) Weekend on October 30, 2022 along with the MCM10K and the full marathon.

The RRCA Championship Event Series is the largest grassroots-organized running series in the U.S. with over 200 races participating that attract nearly 300,000 participants. The designation of the MCM50K as the RRCA District of Columbia Ultra Championship for 2021 means that runners competing in the event will be eligible for not only MCM age group and overall awards, but also RRCA honors.

No Federal Endorsement Implied.


2022 MCM Weekend Registration

Due to the number of expected deferment re-registrations from 2020 and 2021, the Marine Corps Marathon Organization (MCMO) will be rolling out the 47th Marine Corps Marathon (MCM) Weekend Events registration in stages.

Read more


Run for a Cause with MCM Charity Partners

Choose an organization that resonates with you and click the links to connect directly with the organization and their representatives to find out how you can add purpose to your miles. Charities may have entries to the MCM, MCM10K and even the MCM50K.

Read more