Spring and Fall Ultra Marathons on Chicago's Lakefront

21st Annual Chicago Lakefront 50/50

Saturday, October 31, 2020
50K:  8:30 AM

RESULTS! 2020 50k | 2020 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


As of August 1, 2020, the race will be allowed to continue at the Jackson Park Grove A & B locations with a maximum of 50 participants for the 50K race and 50 participants for the 50 mile race.  The races will have separate start/finish areas and times to comply with the Chicago Park District permitting requirements.  Final details are still pending for the race course, which will be on the lakefront path on the east side of Lake Shore Drive.  All of the race information below is subject to change. 


Southside Location. The Start/Finish Area is located at Jackson Park, 6300 S. Lake Shore Drive, Chicago, IL 60649, on the West side of Lake Shore Dr.


50M:  7:00 AM (11-hour time limit)
50K:  8:30 AM (9-hour time limit)
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 first see Pat Onines (Co-Race Director) on race day at the Start/Finish area.  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, and aid stations might not be available until the official race starts.  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.
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 plaques.

Long Sleeve Tech Shirt

To every paid participant.

Aid Stations

  • (Details still pending and may change)
  • The start/finish turnaround location will be the only manned aid station and will be stocked with water, Tailwind, Coke, Mountain Dew, and a variety of food items.
  • There will be a drop bag area at the start/finish location for runners to access their own hydration, nutrition, and clothing needs.
  • Runners are strongly encouraged to carry their own bottles or hydration vest in order to complete each out and back loop self-sustained.
  • Details for how the aid stations will be set up to ensure safe and healthy measures are maintained will be emailed to participants closer to the race date.


On-line here.
Am I Registered? Coming?

Fees (subject to change)


50K 50M
  Through July 31 $55 $80
August 1 thru September 15 $60 $85
  September 16 thru October 28 $70 $90
  October 29 No registration
  October 30 & 31 $80 $100
Packet Pickup No Friday packet pick up this year.  Pick up on race day only.

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!