Chicago Marathon Training Plan
Prepare for the flat and fast Chicago Marathon course. This plan maximises marathon-pace running for a course that rewards aerobic efficiency over hills.
The plan, week by week
Minutes per week. Tap a week.Training specifically for the Chicago Marathon: a plan that accounts for the course profile, typical weather conditions, and the race-specific fitness that separates prepared runners from generic marathon fitness. The marathon is fundamentally an aerobic event with a metabolic ceiling problem. Running out of glycogen — 'the wall' — is a fuelling and pacing failure, not a fitness failure. The training goal is to build a large enough aerobic base, develop fat oxidation efficiency, and practice race-pace running so the body knows what's coming on race day.
A course built for fast times
The Chicago Marathon is one of the flattest major marathon courses in the world — a net elevation change of just 35 feet across 26.2 miles. This rewards runners who have developed genuine marathon-pace efficiency over those who rely on downhills to make up time. Consistent marathon-pace long runs are the cornerstone of Chicago preparation.
October conditions and how to prepare
Chicago's early October date means autumn conditions that can swing from warm to cold within a single year. Recent editions have seen temperatures from the mid-40s to the low 70s Fahrenheit. Train across a range of conditions, learn your warm-weather pacing adjustments, and have a race plan for each scenario.
Pacing a flat, fast course
The biggest mistake on a flat course is treating the flatness as permission to go out fast. Without hills to force a natural pace modulation, Chicago runners must provide their own discipline. An even split — running the second half within 60–90 seconds of the first half — consistently produces better finish times than a positive split with a fade.
Questions
How many days per week does this marathon plan require?
Most sessions in this plan run four to five days per week, including one quality session, a long run, and easy aerobic running. The plan is designed to be adjustable — with Daash, Claude can restructure it around your available days each week.
Do I need a GPS watch to follow this marathon training plan?
A GPS watch or running app is helpful for tracking pace and distance, but not strictly required. Effort-based running (using a scale of 1–10 perceived exertion) works well for easy runs. For quality sessions where specific paces matter, a watch becomes more valuable.
What should I eat before a long run?
For runs under 60–75 minutes, eating beforehand is optional. For longer runs, a light carbohydrate-based meal two to three hours before the session — oats, toast with banana, or a rice-based option — provides fuel without gastrointestinal issues. Avoid high-fat, high-fibre, or unfamiliar foods on long run mornings.
How does Daash adapt the plan if I miss a session?
Daash sees missed sessions in your Garmin data. Tell Claude why — illness, fatigue, life — and it reworks the coming week: redistributing sessions, reducing volume if needed, or adjusting the next quality session, then updates the workouts on your watch.
Do I need to take gels or nutrition during training for a marathon?
For any long run over 90 minutes, practising race nutrition is valuable. Train with the gels, chews, or drinks available at your target race so your gut is adapted before race day. Do not try a new nutrition product for the first time on race morning.