Chicago Duathlon

The Chicago Duathlon tests your speed and pacing across a fast, flat 24.6-mile course featuring an opening 5K run, a 30K bike split, and a final 5K run. Set against the urban backdrop of Chicago, the route gains only around 300 feet of total elevation, primarily via roadway overpasses and gentle park undulations. The running segments take place on wide, paved asphalt and concrete parkways—frequently routing near the Lake Michigan shoreline, Grant Park, or Burnham Park—demanding a measured opening effort so you do not burn your matches before mounting the bike.

The 30K cycling leg requires sustained power output in aerodynamic tucks along broad, multi-lane lakefront corridors such as DuSable Lake Shore Drive or adjacent park infrastructure. Because topography is largely absent, the primary race-day challenge comes from variable coastal winds funneled off Lake Michigan. Crosswinds and headwind stretches will force you to manage your gear selection and watt distribution carefully.

Transitioning directly into the second 5K run presents the event's sharpest physiological hurdle. Running hard after an aggressive, low-resistance cycle leg along the lakefront will induce immediate leg fatigue. With minimal natural shade along open urban esplanades, managing body temperature and cadence in the closing miles will define your finish.

Out-of-town participants can fly into Chicago O'Hare International Airport (ORD), roughly 18 miles northwest of downtown, or Chicago Midway International Airport (MDW), situated about 10 miles southwest. Both airports offer direct access to central Chicago via the CTA Blue and Orange rail lines, while drivers can navigate into the city via Interstate 90/94 (Kennedy/Dan Ryan Expressways) or Interstate 55. If you are staying downtown, look for accommodations within the Loop, South Loop, or Streeterville neighborhoods, which keep you within a short walk or light spin of central staging areas near Grant Park and Monroe Harbor.

Late August in Chicago brings warm, humid race conditions. Average daytime highs typically reach around 81°F (27°C), with morning lows starting in the mid-60s. You should prepare for noticeable lakefront humidity and pack appropriate sun protection and hydration.

On race morning, driving and parking near the lakefront can be difficult due to traffic detours and parkway closures. Utilize public garages along Michigan Avenue or Columbus Drive, or skip the vehicle entirely by taking CTA trains or rideshares with a bike bag. Arrive early for packet pickup and transition check-in to secure your rack spot without unnecessary stress.