RBC Brooklyn, on this goal. It has the better race morning — and against Key West that is the difference that actually shows up in your finish time.
Build the plan →| A fast time / Boston | RBC Brooklyn | flatter course, cooler typical morning |
| A first marathon | RBC Brooklyn | more forgiving on debut day |
| Easiest entry | Key West | less lottery / qualifier friction |
| Crowd & support | RBC Brooklyn | bigger field, more on-course energy |
| Lower trip cost | Key West | cheaper all-in from South Florida |
Race-morning figures are 30-year normal 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) | RBC Brooklyn Half | Key West Half Marathon |
|---|---|---|
| Green Score (overall) | 7.8 | 8.0 |
| First-timer score | 8.3 | 7.7 |
| Terrain | 8.3 | 10.0 |
| Climate | 8.0 | 5.0 |
| Entry | 8.4 | 10.0 |
| Travel | 5.0 | 9.0 |
| Field & support | 9.0 | 6.0 |
| Distance | half marathon | half marathon |
| Date | May 15, 2027 | January 17, 2027 |
| Location | Brooklyn, NY | Key West, FL |
| Typical race-day weather (normal) | 60°F / dew 50°F | 70°F / dew 62°F |
| Elevation gain | 262 ft | 16 ft |
| Field size | 27,000 | 1,800 |
| Entry | lottery | open |
| Entry fee | $135 | $110 |
| Boston qualifier course | No | No |
Sign in and connect Strava to see your projected finish time and qualifying odds at both races — heat- and course-adjusted to race day.