TCS London, on this goal. It has the easier course and the easier entry — and against Boston 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 | TCS London | more forgiving on debut day |
| Easiest entry | TCS London | less lottery / qualifier friction |
| Crowd & support | Boston | bigger field, more on-course energy |
| Lower trip cost | Boston | 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) | Boston Marathon | TCS London Marathon |
|---|---|---|
| Green Score (overall) | 7.1 | 7.5 |
| First-timer score | 8.0 | 8.9 |
| Terrain | 6.9 | 9.2 |
| Climate | 10.0 | 10.0 |
| Entry | 2.0 | 2.6 |
| Travel | 5.0 | 2.0 |
| Field & support | 10.0 | 10.0 |
| Distance | marathon | marathon |
| Date | April 19, 2027 | April 25, 2027 |
| Location | Hopkinton, MA | London |
| Typical race-day weather (normal) | 49°F / dew 41°F | 48°F / dew 40°F |
| Elevation gain | 814 ft | 256 ft |
| Field size | 30,000 | 50,000 |
| Entry | qualifier | lottery |
| Entry fee | $255 | $175 |
| Boston qualifier course | No | 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.