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BOSTON MARATHON 2025

Alison O'Brien

Bib: 27974•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

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:14/mi
25:36
↑ 97↓ 3451.5%
10K· 6.21 mi
7:34/mi
49:08
↑ 79↓ 1380.4%
15K· 9.32 mi
8:17/mi
1:14:52
↑ 67↓ 78
20K· 12.43 mi
8:39/mi
1:41:46
↑ 106↓ 860.1%
Half· 13.11 mi
8:32/mi
1:47:35
↑ 19↓ 370.5%
25K· 15.53 mi
9:13/mi
2:09:55
↑ 66↓ 880.2%
30K· 18.64 mi
9:54/mi
2:40:42
↑ 181↓ 1480.2%
20M
11:31/mi
2:56:21
↑ 64↓ 500.2%
21M
10:38/mi
3:06:59
↑ 106↓ 241.6%
35K· 21.75 mi
9:23/mi
3:14:00
↑ 17↓ 861.7%
23M
10:37/mi
3:27:18
↑ 23↓ 630.6%
24M
9:47/mi
3:37:05
↓ 821.3%
40K· 24.85 mi
10:20/mi
3:45:55
↓ 200.3%
25.2M
10:26/mi
3:49:31
↑ 13↓ 160.2%
Finish· 26.22 mi
9:14/mi
3:58:56
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:35
Pace8:12 /mi
2nd Half
Distance13.11 mi
Time2:11:21
Pace10:01 /mi
📊Positive Split: 22.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:42:3825:368:1425:36
8:14
-
10K
6.21 mi12:06:1049:087:5423:32
7:34
-0:40
15K
9.32 mi12:31:541:14:528:0225:44
8:17
+0:43
20K
12.43 mi12:58:481:41:468:1126:54
8:39
+0:22
Half
13.11 mi13:04:371:47:358:125:49
8:32
-0:07
25K
15.53 mi13:26:572:09:558:2222:20
9:13
+0:41
30K
18.64 mi13:57:442:40:428:3730:47
9:54
+0:41
20M
20.00 mi14:13:232:56:218:4915:39
11:31
+1:37
21M
21.00 mi14:24:013:06:598:5410:38
10:38
-0:53
35K
21.75 mi14:31:023:14:008:557:01
9:23
-1:15
23M
23.00 mi14:44:203:27:189:0113:18
10:37
+1:14
24M
24.00 mi14:54:073:37:059:039:47
9:47
-0:50
40K
24.85 mi15:02:573:45:559:058:50
10:20
+0:33
25.2M
25.20 mi15:06:333:49:319:063:36
10:26
+0:06
Finish
26.22 mi15:15:583:58:569:079:25
9:14
-1:12

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

7:34 /mi

Average Pace

9:07 /mi

Slowest Pace

11:31 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:47:35

45% of race

Time at Steady Pace

1:19:20

33% of race

Time at Slower Pace

52:01

22% of race

Average Pace: 9:07 /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 mi11:42:3825:368:1425:36
8:14
#18372
10K
6.21 mi12:06:1049:087:5423:32
7:34
#15762
15K
9.32 mi12:31:541:14:528:0225:44
8:17
#16585
20K
12.43 mi12:58:481:41:468:1126:54
8:39
#17275
Half
13.11 mi13:04:371:47:358:125:49
8:32
#17376
25K
15.53 mi13:26:572:09:558:2222:20
9:13
#18008
30K
18.64 mi13:57:442:40:428:3730:47
9:54
#18875
20M
20.00 mi14:13:232:56:218:4915:39
11:31
#19653
21M
21.00 mi14:24:013:06:598:5410:38
10:38
#19726
35K
21.75 mi14:31:023:14:008:557:01
9:23
#19735
23M
23.00 mi14:44:203:27:189:0113:18
10:37
#19981
24M
24.00 mi14:54:073:37:059:039:47
9:47
#20024
40K
24.85 mi15:02:573:45:559:058:50
10:20
#20127
25.2M
25.20 mi15:06:333:49:319:063:36
10:26
#20109
Finish
26.22 mi15:15:583:58:569:079:25
9:14
#20149
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi183726569656917948(Top 63%)6287(Top 51%)6287(Top 115%)
10K6.21 mi3.10 mi15762+26105000+15695000+156912821(Top 45%)3270(Top 27%)3270(Top 60%)
15K9.32 mi3.11 mi16585-8235479-4795479-47917948(Top 63%)6287(Top 51%)6287(Top 115%)
20K12.43 mi3.11 mi17275-6905902-4235902-42319201(Top 68%)7026(Top 57%)7026(Top 128%)
Half13.11 mi0.68 mi17376-1015966-645966-6419438(Top 68%)7159(Top 59%)7159(Top 131%)
25K15.53 mi2.42 mi18008-6326365-3996365-39920814(Top 73%)7985(Top 65%)7985(Top 146%)
30K18.64 mi3.11 mi18875-8676873-5086873-50821331(Top 75%)8413(Top 69%)8413(Top 154%)
20M20.00 mi1.36 mi19653-7787351-4787351-47824556(Top 86%)10247(Top 84%)10247(Top 187%)
21M21.00 mi1.00 mi19726-737418-677418-6720409(Top 72%)8133(Top 67%)8133(Top 149%)
35K21.75 mi0.75 mi19735-97436-187436-1819889(Top 70%)7920(Top 65%)7920(Top 145%)
23M23.00 mi1.25 mi19981-2467608-1727608-17222338(Top 79%)9245(Top 76%)9245(Top 169%)
24M24.00 mi1.00 mi20024-437654-467654-4620685(Top 73%)8438(Top 69%)8438(Top 154%)
40K24.85 mi0.85 mi20127-1037732-787732-7821481(Top 76%)8915(Top 73%)8915(Top 163%)
25.2M25.20 mi0.35 mi20109+187729+37729+318843(Top 66%)7554(Top 62%)7554(Top 138%)
Finish26.22 mi1.02 mi20149-407759-307759-3020149(Top 71%)8227(Top 67%)8227(Top 150%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21story building
+97ft-345ft

Overall

17948

Females

6287

F18-39

6287

5K→10K

3.1 - 6.2 mi

Top 45%
×5story building
+79ft-138ft

Overall

12821

Females

3270

F18-39

3270

10K→15K

6.2 - 9.3 mi

Top 63%
×3story building
+67ft-78ft

Overall

17948

Females

6287

F18-39

6287

15K→20K

9.3 - 12.4 mi

Top 68%
×5story building
+106ft-86ft

Overall

19201

Females

7026

F18-39

7026

20K→Half

12.4 - 13.1 mi

Top 68%
×2story building
+19ft-37ft

Overall

19438

Females

7159

F18-39

7159

Half→25K

13.1 - 15.5 mi

Top 73%
×4story building
+66ft-88ft

Overall

20814

Females

7985

F18-39

7985

25K→30K

15.5 - 18.6 mi

Top 75%
×9story building
+181ft-148ft

Overall

21331

Females

8413

F18-39

8413

30K→20M

18.6 - 20.0 mi

Top 86%
×5story building
+64ft-50ft

Overall

24556

Females

10247

F18-39

10247

20M→21M

20.0 - 21.0 mi

Top 72%
×8story building
+106ft-24ft

Overall

20409

Females

8133

F18-39

8133

21M→35K

21.0 - 21.8 mi

Top 70%
×7story building
+17ft-86ft

Overall

19889

Females

7920

F18-39

7920

35K→23M

21.8 - 23.0 mi

Top 79%
×5story building
+23ft-63ft

Overall

22338

Females

9245

F18-39

9245

23M→24M

23.0 - 24.0 mi

Top 73%
×6story building
+12ft-82ft

Overall

20685

Females

8438

F18-39

8438

24M→40K

24.0 - 24.9 mi

Top 76%
×1story
+6ft-20ft

Overall

21481

Females

8915

F18-39

8915

40K→25.2M

24.9 - 25.2 mi

Top 66%
×1story
+13ft-16ft

Overall

18843

Females

7554

F18-39

7554

25.2M→Finish

25.2 - 26.2 mi

Top 71%
×2story building
+22ft-21ft

Overall

20149

Females

8227

F18-39

8227

Passing Analysis

Category:
Athletes Passed
3188
Passed By
4965
Net Change
-1777
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18372
5K → 10K26144+2610#18372#15762
10K → 15K47870-823#15762#16585
15K → 20K62752-690#16585#17275
20K → Half9110-101#17275#17376
Half → 25K55687-632#17376#18008
25K → 30K63930-867#18008#18875
30K → 20M14792-778#18875#19653
20M → 21M77150-73#19653#19726
21M → 35K4251-9#19726#19735
35K → 23M38284-246#19735#19981
23M → 24M5396-43#19981#20024
24M → 40K32135-103#20024#20127
40K → 25.2M3416+18#20127#20109
25.2M → Finish4888-40#20109#20149
TOTALS31884965-1777
📊

Passing Visuals

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