B.A.A. Boston Half Marathon
B.A.A. Boston Half Marathon race day weather
Cool start, moderate wind shifts
Runners will face a temperature increase from 49°F at the start to 52°F at the finish, with moderate wind gusts reaching 32 mph from the WNW. The first two miles will feature a headwind, making pacing adjustments crucial early on. After mile 8, a tailwind will aid runners, but they should remain mindful of wind changes, especially at miles 11 and 12.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for B.A.A. Boston Half Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
B.A.A. Boston Half Marathon route and elevation
The B.A.A. Boston Half Marathon course has about 493 ft (150 m) of climbing and 493 ft (150 m) of descent, and finishes near the elevation it starts. It is hillier than 85% of the half marathon courses racecast.io has mapped, measured by what the hills cost in time. The hardest mile is mile 7, with 71 ft (22 m) of climbing and a 1.1% average grade.
Biggest climbs
- Miles 6.2 to 7.1: climbs about 90 ft (27 m).
- Miles 8.7 to 9.1: climbs about 55 ft (16 m).
- Miles 11 to 12.1: climbs about 85 ft (26 m).
What the hills cost
- 1:45 on a flat course is about 1:46 here (1 minute slower).
- 2:00 on a flat course is about 2:01 here (1 minute slower).
- 2:15 on a flat course is about 2:16 here (1 minute slower).
Hills only, priced mile by mile on the course map. The pace calculator above adds the race-day weather.
Even-effort splits for a 1:45, 2:00 or 2:15 finish
| Mile | Climb | Descent | 1:45 | 2:00 | 2:15 |
|---|---|---|---|---|---|
| 1 | 10 ft | 110 ft | 7:33 | 8:38 | 9:43 |
| 2 | 53 ft | 24 ft | 8:10 | 9:20 | 10:30 |
| 3 | 32 ft | 24 ft | 8:00 | 9:08 | 10:16 |
| 4 | 30 ft | 87 ft | 7:42 | 8:49 | 9:55 |
| 5 | 34 ft | 19 ft | 8:03 | 9:12 | 10:21 |
| 6 | 30 ft | 37 ft | 7:54 | 9:01 | 10:09 |
| 7 | 71 ft | 12 ft | 8:25 | 9:38 | 10:50 |
| 8 | 26 ft | 58 ft | 7:49 | 8:55 | 10:02 |
| 9 | 64 ft | 35 ft | 8:09 | 9:19 | 10:29 |
| 10 | 14 ft | 54 ft | 7:46 | 8:53 | 10:00 |
| 11 | 60 ft | 39 ft | 8:06 | 9:16 | 10:25 |
| 12 | 74 ft | 16 ft | 8:25 | 9:36 | 10:49 |
| 13 | 47 ft | 35 ft | 8:02 | 9:11 | 10:19 |
| Last 0.1 | 6 ft | 0 ft | 0:56 | 1:04 | 1:12 |
Explore the B.A.A. Boston Half Marathon course with the weather and your pace along the route, or compare it with other races.
Get your personalized B.A.A. Boston Half Marathon race plan
A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.
About the B.A.A. Boston Half Marathon
The Boston Half is a 13.1-mile road race run by the Boston Athletic Association on a Sunday in early November. It starts and finishes in Franklin Park, with the finish on Pierpont Road, and follows the Emerald Necklace parks past the Arnold Arboretum, Jamaica Pond and Olmsted Park. Out-and-back sections reach toward Fenway along the Riverway and down Morton Street toward Mattapan. It is the closing race of the B.A.A. Distance Medley, after the Boston 5K and B.A.A. 10K.
