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BOSTON MARATHON 2025

Allison Chou

Bib: 30375•F

MA

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
29:11
Rank: #23896
Start → 5K
29:11 | 9:24/mi
10K· 6.21 mi
58:15
Rank: #23806 (+90)
5K → 10K
29:04 | 9:21/mi
15K· 9.32 mi
1:26:41
Rank: #23443 (+363)
10K → 15K
28:26 | 9:09/mi
20K· 12.43 mi
1:54:51
Rank: #22956 (+487)
15K → 20K
28:10 | 9:04/mi
Half· 13.11 mi
2:01:02
Rank: #22904 (+52)
20K → Half
6:11 | 9:04/mi
25K· 15.53 mi
2:23:01
Rank: #22456 (+448)
Half → 25K
21:59 | 9:04/mi
30K· 18.64 mi
2:50:51
Rank: #21607 (+849)
25K → 30K
27:50 | 8:58/mi
20M
3:02:55
Rank: #21226 (+381)
30K → 20M
12:04 | 8:53/mi
21M
3:12:01
Rank: #20846 (+380)
20M → 21M
9:06 | 9:06/mi
35K· 21.75 mi
3:18:27
Rank: #20686 (+160)
21M → 35K
6:26 | 8:36/mi
23M
3:29:34
Rank: #20429 (+257)
35K → 23M
11:07 | 8:53/mi
24M
3:38:07
Rank: #20231 (+198)
23M → 24M
8:33 | 8:33/mi
40K· 24.85 mi
3:45:24
Rank: #20008 (+223)
24M → 40K
7:17 | 8:31/mi
25.2M
3:48:39
Rank: #19923 (+85)
40K → 25.2M
3:15 | 9:25/mi
Finish· 26.22 mi
3:56:47
Rank: #19699 (+224)
25.2M → Finish
8:08 | 7:59/mi

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time2:01:02
Pace9:14 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:55:45
Pace8:50 /mi
📊Negative Split: 4.4% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:54:0729:119:2429:11
9:24
-
10K
6.21 mi12:23:1158:159:2229:04
9:21
-0:03
15K
9.32 mi12:51:371:26:419:1828:26
9:09
-0:12
20K
12.43 mi13:19:471:54:519:1428:10
9:04
-0:05
Half
13.11 mi13:25:582:01:029:146:11
9:04
0:00
25K
15.53 mi13:47:572:23:019:1221:59
9:04
0:00
30K
18.64 mi14:15:472:50:519:1027:50
8:58
-0:06
20M
20.00 mi14:27:513:02:559:0912:04
8:53
-0:05
21M
21.00 mi14:36:573:12:019:099:06
9:06
+0:13
35K
21.75 mi14:43:233:18:279:076:26
8:36
-0:30
23M
23.00 mi14:54:303:29:349:0711:07
8:53
+0:17
24M
24.00 mi15:03:033:38:079:058:33
8:33
-0:20
40K
24.85 mi15:10:203:45:249:047:17
8:31
-0:02
25.2M
25.20 mi15:13:353:48:399:043:15
9:25
+0:54
Finish
26.22 mi15:21:433:56:479:028:08
7:59
-1:26

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

7:59 /mi

Average Pace

9:02 /mi

Slowest Pace

9:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

30:24

13% of race

Time at Steady Pace

3:26:23

87% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 9:02 /mi

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

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

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

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:54:0729:119:2429:11
9:24
#23896
10K
6.21 mi12:23:1158:159:2229:04
9:21
#23806
15K
9.32 mi12:51:371:26:419:1828:26
9:09
#23443
20K
12.43 mi13:19:471:54:519:1428:10
9:04
#22956
Half
13.11 mi13:25:582:01:029:146:11
9:04
#22904
25K
15.53 mi13:47:572:23:019:1221:59
9:04
#22456
30K
18.64 mi14:15:472:50:519:1027:50
8:58
#21607
20M
20.00 mi14:27:513:02:559:0912:04
8:53
#21226
21M
21.00 mi14:36:573:12:019:099:06
9:06
#20846
35K
21.75 mi14:43:233:18:279:076:26
8:36
#20686
23M
23.00 mi14:54:303:29:349:0711:07
8:53
#20429
24M
24.00 mi15:03:033:38:079:058:33
8:33
#20231
40K
24.85 mi15:10:203:45:249:047:17
8:31
#20008
25.2M
25.20 mi15:13:353:48:399:043:15
9:25
#19923
Finish
26.22 mi15:21:433:56:479:028:08
7:59
#19699
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi238969642964222667(Top 80%)8926(Top 73%)8926(Top 163%)
10K6.21 mi3.10 mi23806+909573+699573+6923704(Top 83%)9518(Top 78%)9518(Top 174%)
15K9.32 mi3.11 mi23443+3639378+1959378+19522667(Top 80%)8926(Top 73%)8926(Top 163%)
20K12.43 mi3.11 mi22956+4879102+2769102+27621302(Top 75%)8198(Top 67%)8198(Top 150%)
Half13.11 mi0.68 mi22904+529072+309072+3022083(Top 78%)8640(Top 71%)8640(Top 158%)
25K15.53 mi2.42 mi22456+4488843+2298843+22920213(Top 71%)7652(Top 63%)7652(Top 140%)
30K18.64 mi3.11 mi21607+8498409+4348409+43417470(Top 62%)6292(Top 51%)6292(Top 115%)
20M20.00 mi1.36 mi21226+3818235+1748235+17416156(Top 57%)5698(Top 47%)5698(Top 104%)
21M21.00 mi1.00 mi20846+3808038+1978038+19714150(Top 50%)4723(Top 39%)4723(Top 86%)
35K21.75 mi0.75 mi20686+1607965+737965+7316124(Top 57%)5867(Top 48%)5867(Top 107%)
23M23.00 mi1.25 mi20429+2577850+1157850+11515597(Top 55%)5675(Top 46%)5675(Top 104%)
24M24.00 mi1.00 mi20231+1987769+817769+8114874(Top 52%)5329(Top 44%)5329(Top 97%)
40K24.85 mi0.85 mi20008+2237664+1057664+10513616(Top 48%)4782(Top 39%)4782(Top 87%)
25.2M25.20 mi0.35 mi19923+857625+397625+3914300(Top 50%)5220(Top 43%)5220(Top 95%)
Finish26.22 mi1.02 mi19699+2247519+1067519+10612806(Top 45%)4349(Top 36%)4349(Top 80%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 80%
×21stories
+97ft-345ft

Overall

22667

Females

8926

F18-39

8926

5K→10K

3.1 - 6.2 mi

Top 83%
×5stories
+79ft-138ft

Overall

23704

Females

9518

F18-39

9518

10K→15K

6.2 - 9.3 mi

Top 80%
×3stories
+67ft-78ft

Overall

22667

Females

8926

F18-39

8926

15K→20K

9.3 - 12.4 mi

Top 75%
×5stories
+106ft-86ft

Overall

21302

Females

8198

F18-39

8198

20K→Half

12.4 - 13.1 mi

Top 78%
×2stories
+19ft-37ft

Overall

22083

Females

8640

F18-39

8640

Half→25K

13.1 - 15.5 mi

Top 71%
×4stories
+66ft-88ft

Overall

20213

Females

7652

F18-39

7652

25K→30K

15.5 - 18.6 mi

Top 62%
×9stories
+181ft-148ft

Overall

17470

Females

6292

F18-39

6292

30K→20M

18.6 - 20.0 mi

Top 57%
×5stories
+64ft-50ft

Overall

16156

Females

5698

F18-39

5698

20M→21M

20.0 - 21.0 mi

Top 50%
×8stories
+106ft-24ft

Overall

14150

Females

4723

F18-39

4723

21M→35K

21.0 - 21.8 mi

Top 57%
×7stories
+17ft-86ft

Overall

16124

Females

5867

F18-39

5867

35K→23M

21.8 - 23.0 mi

Top 55%
×5stories
+23ft-63ft

Overall

15597

Females

5675

F18-39

5675

23M→24M

23.0 - 24.0 mi

Top 52%
×6stories
+12ft-82ft

Overall

14874

Females

5329

F18-39

5329

24M→40K

24.0 - 24.9 mi

Top 48%
×1story
+6ft-20ft

Overall

13616

Females

4782

F18-39

4782

40K→25.2M

24.9 - 25.2 mi

Top 50%
×1story
+13ft-16ft

Overall

14300

Females

5220

F18-39

5220

25.2M→Finish

25.2 - 26.2 mi

Top 45%
×2stories
+22ft-21ft

Overall

12806

Females

4349

F18-39

4349

Passing Analysis

Category:
Athletes Passed
4457
Passed By
260
Net Change
+4197
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23896
5K → 10K289199+90#23896#23806
10K → 15K39633+363#23806#23443
15K → 20K4958+487#23443#22956
20K → Half597+52#22956#22904
Half → 25K4524+448#22904#22456
25K → 30K8501+849#22456#21607
30K → 20M3810+381#21607#21226
20M → 21M3800+380#21226#20846
21M → 35K1622+160#20846#20686
35K → 23M2592+257#20686#20429
23M → 24M1980+198#20429#20231
24M → 40K2230+223#20231#20008
40K → 25.2M850+85#20008#19923
25.2M → Finish2284+224#19923#19699
TOTALS4457260+4197
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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