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 at 7:15 a.m. 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 registration is closed.

Virtual Registration

MCM50K registration is closed.

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 for the MCM50K are now closed. No exceptions.

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.

2022 MCM Gear

Run with purpose!

Commemorate your race with limited-edition Brooks tops, jackets, and accessories so you can celebrate your accomplishment long after you cross the finish.

Shop Now!

Start Line

The start of the MCM50K is at 7:15 a.m. and is located on Route 110 in Arlington, Va. - the same location as the Marine Corps Marathon.

The USATF-certified MCM50K course will follow the MCM course across the Key Bridge and divert at mile 4.5 for an out-and-back along Canal Road. There, the MCM50K course rejoins the MCM and continues onto the finish at the Marine Corps War Memorial. The course includes 13 waters points and 11 aid stations.

The MCM50K participants can visit Runners Village prior to the event for the info tent, porta johns, UPS Baggage Drop-off.

Course Map

Food Stations

**Updated September 26**

  • FS1 (MCM50K Only): American Dream Nut Butter - On Canal Road NW in Georgetown between mile 8 and 9.
  • FS2: Applesauce pouches from Wegmans - West side of Rock Creek Parkway at Thompson's boat house after Virginia Avenue between mile 14 and 15.
  • FS3: Honey Stinger Chews - At Ohio Drive before Water Point 6, at the end of Hains Point in East Potomac Park between Miles 17 and 18.
  • FS4: UnTapped Energy Gels - At the intersection of Jefferson Drive SW and 4 Street SW along the National Mall to WP 9 before Mile 24.
  • FS5 sponsored by Cogent Steps: Tootsie Rolls - Near between mile 28 and 29 in Crystal City.

Fuel Up with High Protein, Low Carb American Dream Nut Butter

Special for the MCM50K food station will be a variety of peanut, almond and cashew nut butters from American Dream Nut Butter. The different nut butters will be separated for allergy purposes.

Healthy fats combine with grass fed lactose-free whey protein isolate to offer a one-of-a-kind way to fuel up for your next big adventure. Always 100% gluten-free, low carb, low sugar and free of artificial sweeteners, American Dream Nut Butter is handcrafted daily in small batches. 10% of all proceeds are donated to sending care packages to our veterans and troops stationed overseas.

Click here to learn about how you can fuel with American Dream Nut Butter.

UnTapped All Natural Athletic Fuel

Maple Syrup has many naturally occurring micro and macro nutrients that your body requires to perform at its highest level. Learn about how you can use maple to improve your fueling strategy. There will be a combination of Maple UnTapped, Coffee UnTapped and Salted Cocoa UnTapped flavored Athletic fuel on the course.

Learn More

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.

Water Points

WP 1: Eastbound Lee Highway between Wayne and Adams Streets.
50K WP: Canal Road
WP 2: Intersection of M and 33rd Streets, NW, in Georgetown.
WP 3/4: Along Rock Creek and Potomac Parkway at grassy median. Water Point #3 is located in northbound lanes; Water Point #4 is located in southbound lanes.
WP 5/7: Independence Avenue and Ohio Drive SW at West Potomac Park.
WP 6: Ohio Drive SW parking area near the end of Hains Point.
WP 8: At Madison Drive NW and 12th Street NW along the National Mall.
WP 9: At Jefferson Drive SW and 7th Street SW along the National Mall.
WP 10: Near Army-Navy Drive at Eads Street. (Water Point #10 also supports the MCM10K).
WP 11: Along Long Bridge Drive in soccer complex parking lot.
WP 12: At Lady Bird Johnson parking area on Boundary Channel Drive, in the North Pentagon parking area.
Post-MCM: Bottled water from Wegmans and Gatorade will be distributed in the hospitality area.

Aid Stations

Location 1: Canal Road

After location one, the MCM50K will travel through the MCM aid stations:

AS 1: Francis Scott Key Park at the corner of Key Bridge and M Street
AS 2/3: Along Rock Creek and Potomac Parkway below Waterside Drive
AS 4/6: Independence Ave SW and Ohio Drive SW in West Potomac Park at the Erickson Memorial
AS 5: Ohio and Buckeye Drive SW underneath the I395 overpass (Case Bridge) on the Washington Channel side of East Potomac Park
AS 7: East of the intersection of 14th Street NW and Madison Drive NW, in front of the Smithsonian National Museum of American History
AS 8: Jefferson Drive SW and 12th Street SW at the Department of Agriculture
AS 9: Eads Street Parking lot at Army/Navy Drive
AS 10: Parking lot of Public Storage on West side of Long Bridge North of 6th Street S

Medical Tents are located near the finish on the Marine Corps War Memorial.

  • Medical Information tent is located at the intersection of Lynn Street and Fairfax Drive. Medical personnel will track runners and record medical data to ensure timely updates are available to families of runners receiving assistance.

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