Spring and Fall Ultra Marathons on Chicago's Lakefront

20th Annual Chicago Lakefront 50/50

Saturday, November 2, 2019
50M: 6:30 AM
50K:  8:30 AM

RESULTS! 2019 50k | 2019 50m

...Fastest 50-mile race times for any race in the U.S. last year (2017) for both men and women. - Ultrarunning Magazine, February 2018


Northside Location. The Start/Finish Area is located at the Foster Avenue Beach House, 5200 N. Lake Shore Drive, Chicago, IL 60640.

If you are entering Lincoln Park at Foster Avenue, from northbound Lake Shore Drive or Foster Avenue, look for our tent as soon as you enter the Park, on the north side of Foster Drive, east of the Foster Beach Parking Lot.

If you are entering Lincoln Park from southbound Lake Shore Drive at Lawrence, Wilson or Montrose Avenues, turn left at Simonds Drive, and go north. Simonds merges into Foster Drive. Take Foster Drive as far east as you can go!


50M:  6:30 AM (11-hour time limit)
50K:  8:30 AM
Early Start Option Early starts are available to any runner who wants to do so but you will not officially be in the competition (overall or age group). 

The way it works is to see Pat Onines (Co-Race Director) first on race day.  He will add you to the early start list.  He will also mark the bottom of your bib # with an “ES”.  You may then start whenever you wish and time yourself.  You’ll be responsible to know the course especially where the turn around is. 

When you finish, you’ll get a medal and a “Finished” in the official results with no time.  Be sure to let the finish line crew know you were an early starter to avoid any confusion with those being timed.  They will take the bottom of your bib # and give it to Pat as evidence of your finish. 

Please remember that early starters or those that finish after the race time limit will have a “Finished” in the results but will not receive a position or a time.


  • Consists of 4 out-and-back segments for the 50m and three for the 50k.
  • The races follow the Lakefront running path.
  • Mostly asphalt with some concrete sections.
  • One of the flattest 50k and 50 mile courses in North America.
  • The current 50 mi. world record was set on Chicago's lakefront in 1984.
  • 50k course map
  • 50 Mile course map
Recognition for Individual and Course Record Performances If you are planning to set a record at this Event that you want to be recognized by USATF, you must contact us as early as possible before registering for the Event to inform us of your intentions, and to discuss the USATF's requirements for recognition of your achievement.


  • Belt buckles to 50M finishers 11 hours and under (no early starters).
  • Medals to all 50K finishers.
  • Overall male and female trophies.

Long Sleeve Tech Shirt

To every paid participant.

Aid Stations

Three; approximately every 2.5 miles. Amply stocked with water, Tailwind, cola, and a variety of food items. There will be a limited supply of HUMA gels available.


On-line here.
By mail here.
Am I Registered? Coming?

Fees (subject to change)


50K 50M
  Through July 1 $50 $70
July 2 through October 30 $60 $80
  October 31 No registration
  November 1 & 2 $70 $90
Packet Pickup Registration for both races and packet pick-up will be available at Road Runner Sports from 12-6. 1435 N Kingsbury St. Chicago, IL 60642, on Friday, 11/1/19, from 12:00 Noon until 6:00 PM. and on Race Day at the Foster Ave Beach House one hour before the Start of both races. NOTE: You will be unable to register anywhere for either race on Thursday, 10/31/19 as I need to work on the bib numbers. Transfer of race numbers to unregistered runners is not permitted. Don't do it! You and the bandit runner will be banned from future events. There are no refunds for any reason whatsoever.

More Information

Chicago Ultra Marathon
20 Jonathan
Lake Zurich IL 60047
Phone: 847-648-8843

Volunteer Information

Please send an e-mail to with your contact information, and include Chicago Lakefront 50/50 in your subject line.  Thank you!