TCS London, on this goal. It has the better race morning — and against Bank of America Chicago that is the difference that actually shows up in your finish time.
Build the plan →| A fast time / Boston | TCS London | flatter course, cooler typical morning |
| A first marathon | Bank of America Chicago | more forgiving on debut day |
| Easiest entry | Bank of America Chicago | less lottery / qualifier friction |
| Crowd & support | Bank of America Chicago | bigger field, more on-course energy |
| Lower trip cost | Bank of America Chicago | cheaper all-in from South Florida |
Race-morning figures are 10-year history normals, not forecasts. Cost and travel are estimated from South Florida; your own origin may flip the trip-cost row. Full method on the methodology page.
| Score (10 = easiest) | Bank of America Chicago Marathon | TCS London Marathon |
|---|---|---|
| Green Score (overall) | 8.1 | 7.5 |
| First-timer score | 8.9 | 8.9 |
| Terrain | 9.2 | 9.2 |
| Climate | 9.0 | 10.0 |
| Entry | 6.0 | 2.6 |
| Travel | 5.0 | 2.0 |
| Field & support | 10.0 | 10.0 |
| Distance | marathon | marathon |
| Date | October 11, 2026 | April 25, 2027 |
| Location | Chicago, IL | London |
| Typical race-day weather (normal) | 56°F / dew 50°F | 48°F / dew 40°F |
| Elevation gain | 243 ft | 256 ft |
| Field size | 52,150 | 50,000 |
| Entry | lottery | lottery |
| Entry fee | $250 | $175 |
| Boston qualifier course | Yes | Yes |
Sign in and connect Strava to see your projected finish time and qualifying odds at both races — heat- and course-adjusted to race day.