Spring and Fall Ultra Marathons on Chicago's Lakefront

16th Annual Chicago Lakefront 50/50

Saturday, October 31, 2015
50M: 6:30 AM
50K:  8:30 AM

RESULTS! 2015 50k | 2015 50m


Both races start and finish on Chicago's lakefront, at Jackson Park Grove 19A, approximately 100 yards west of the 63rd Street Beach House (the previous start/finish)


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. 
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, Gatorade, cola, and a variety of food items.


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

Fees (subject to change)


50K 50M
  Through April 30 $45 $65
May 1 through October 28 $55 $75
  October 29 No registration
  October 30 and October 31 $65 $85
Packet Pickup Race packets and registration will be available on Friday, October 30 (noon-6pm) at:
1466 North Halsted Street
Chicago, IL 60642

Metered parking in the street. Free parking in the garage in back of the store for 90 minutes with store validation.

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!