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BOSTON MARATHON 2025

Emma Kerr

ON

Bib: 15303 F

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 43%
Gender (Female)
#0 / 12228
Top 28%
Division (F18-39)
#0 / 5469
Top 46%
Race Day Weather
50°/40°F
broken clouds

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:35/mi
23:34
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:25/mi
46:37
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:21/mi
1:09:26
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:24/mi
1:32:26
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:17/mi
1:37:24
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:26/mi
1:55:26
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:53/mi
2:19:56
↑ 181↓ 1480.2%
138 ft elev
20M
8:13/mi
2:31:06
↑ 64↓ 500.2%
148 ft elev
21M
8:57/mi
2:40:03
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:07/mi
2:46:07
↑ 17↓ 861.7%
156 ft elev
23M
9:07/mi
2:57:32
↑ 23↓ 630.6%
116 ft elev
24M
9:51/mi
3:07:23
↓ 821.3%
34 ft elev
40K· 24.85 mi
9:12/mi
3:15:15
↓ 200.3%
20 ft elev
25.2M
9:43/mi
3:18:36
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:12/mi
3:26:57
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:37:247:26 /mi⚡ faster
2nd Half
1:49:338:21 /mi+12.5%
Positive split — 12.5% slower in the second half
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointTimeAvg PaceSegment LengthSegment TimeSegment PaceTrendDiff
5K
23:347:353.11 mi23:34
7:35
-
10K
46:377:303.10 mi23:03
7:25
-0:10
15K
1:09:267:273.11 mi22:49
7:21
-0:04
20K
1:32:267:263.11 mi23:00
7:24
+0:03
Half(13.11 mi)
1:37:247:260.68 mi4:58
7:17
-0:07
25K
1:55:267:262.42 mi18:02
7:26
+0:09
30K
2:19:567:303.11 mi24:30
7:53
+0:27
20M
2:31:067:331.36 mi11:10
8:13
+0:20
21M
2:40:037:371.00 mi8:57
8:57
+0:44
35K
2:46:077:380.75 mi6:04
8:07
-0:50
23M
2:57:327:431.25 mi11:25
9:07
+1:00
24M
3:07:237:481.00 mi9:51
9:51
+0:44
40K
3:15:157:510.85 mi7:52
9:12
-0:39
25.2M
3:18:367:530.35 mi3:21
9:43
+0:31
Finish(26.22 mi)
3:26:577:541.02 mi8:21
8:12
-1:31
Trend:
Faster pace
Steady pace
Slower pace

Checkpoints & Pacing

Pace Line

Fastest Pace

7:17 /mi

Average Pace

7:54 /mi

Slowest Pace

9:51 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Time at Faster Pace

1:55:26

56% of race

Time at Steady Pace

50:05

24% of race

Time at Slower Pace

41:26

20% of race

Average Pace: 7:54 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

Heatmap

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0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Checkpoint and Segment Rankings

CheckpointSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi13001331633161037620682068
10K3.10 mi12159+8422893+4232893+4231137125022502
15K3.11 mi11532+6272595+2982595+2981037620682068
20K3.11 mi11105+4272401+1942401+194995519441944
Half(13.11 mi)0.68 mi11030+752356+452356+45992919451945
25K2.42 mi10700+3302233+1232233+123948018711871
30K3.11 mi10652+482284-512284-511054825662566
20M1.36 mi10745-932383-992383-991193034063406
21M1.00 mi10854-1092478-952478-951322242214221
35K0.75 mi10908-542530-522530-521300741554155
23M1.25 mi11297-3892774-2442774-2441692263976397
24M1.00 mi11905-6083121-3473121-3472089685468546
40K0.85 mi12146-2413279-1583279-1581734967676767
25.2M0.35 mi12207-613328-493328-491569359045904
Finish(26.22 mi)1.02 mi12261-543387-593387-591423350575057

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 37%
×21story building
+97ft-345ft

Overall

10376

Females

2068

F18-39

2068

5K→10K

3.1 - 6.2 mi

Top 40%
×5story building
+79ft-138ft

Overall

11371

Females

2502

F18-39

2502

10K→15K

6.2 - 9.3 mi

Top 37%
×3story building
+67ft-78ft

Overall

10376

Females

2068

F18-39

2068

15K→20K

9.3 - 12.4 mi

Top 35%
×5story building
+106ft-86ft

Overall

9955

Females

1944

F18-39

1944

20K→Half

12.4 - 13.1 mi

Top 35%
×2story building
+19ft-37ft

Overall

9929

Females

1945

F18-39

1945

Half→25K

13.1 - 15.5 mi

Top 33%
×4story building
+66ft-88ft

Overall

9480

Females

1871

F18-39

1871

25K→30K

15.5 - 18.6 mi

Top 37%
×9story building
+181ft-148ft

Overall

10548

Females

2566

F18-39

2566

30K→20M

18.6 - 20.0 mi

Top 42%
×5story building
+64ft-50ft

Overall

11930

Females

3406

F18-39

3406

20M→21M

20.0 - 21.0 mi

Top 47%
×8story building
+106ft-24ft

Overall

13222

Females

4221

F18-39

4221

21M→35K

21.0 - 21.8 mi

Top 46%
×7story building
+17ft-86ft

Overall

13007

Females

4155

F18-39

4155

35K→23M

21.8 - 23.0 mi

Top 60%
×5story building
+23ft-63ft

Overall

16922

Females

6397

F18-39

6397

23M→24M

23.0 - 24.0 mi

Top 74%
×6story building
+12ft-82ft

Overall

20896

Females

8546

F18-39

8546

24M→40K

24.0 - 24.9 mi

Top 61%
×1story
+6ft-20ft

Overall

17349

Females

6767

F18-39

6767

40K→25.2M

24.9 - 25.2 mi

Top 55%
×1story
+13ft-16ft

Overall

15693

Females

5904

F18-39

5904

25.2M→Finish

25.2 - 26.2 mi

Top 50%
×2story building
+22ft-21ft

Overall

14233

Females

5057

F18-39

5057

Passing Analysis

Category:
▲Net Change
+0
0 passed by0 passed
SegmentMovementRank
Start → 5K-#13001
5K → 10K
48890+842
#13001 → #12159
10K → 15K
16643+627
#12159 → #11532
15K → 20K
20447+427
#11532 → #11105
20K → Half
1287+75
#11105 → #11030
Half → 25K
27357+330
#11030 → #10700
25K → 30K
208256+48
#10700 → #10652
30K → 20M
17986-93
#10652 → #10745
20M → 21M
17566-109
#10745 → #10854
21M → 35K
9844-54
#10854 → #10908
35K → 23M
41728-389
#10908 → #11297
23M → 24M
62618-608
#11297 → #11905
24M → 40K
26524-241
#11905 → #12146
40K → 25.2M
8221-61
#12146 → #12207
25.2M → Finish
10652-54
#12207 → #12261
TOTALS
22793019+740
#13001 → #12261

Passing Visualized

Category:
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Passing Circle

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Position Flow

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Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing