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BOSTON MARATHON 2025

Carolyn O'Reilly

Bib: 15521•F

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 47%
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
7:54/mi
24:32
↑ 97↓ 3451.5%
10K· 6.21 mi
8:09/mi
49:51
↑ 79↓ 1380.4%
15K· 9.32 mi
8:13/mi
1:15:23
↑ 67↓ 78
20K· 12.43 mi
8:14/mi
1:40:58
↑ 106↓ 860.1%
Half· 13.11 mi
8:07/mi
1:46:30
↑ 19↓ 370.5%
25K· 15.53 mi
8:27/mi
2:07:00
↑ 66↓ 880.2%
30K· 18.64 mi
8:55/mi
2:34:42
↑ 181↓ 1480.2%
20M
8:40/mi
2:46:29
↑ 64↓ 500.2%
21M
9:58/mi
2:56:27
↑ 106↓ 241.6%
35K· 21.75 mi
8:53/mi
3:03:06
↑ 17↓ 861.7%
23M
9:10/mi
3:14:35
↑ 23↓ 630.6%
24M
8:37/mi
3:23:12
↓ 821.3%
40K· 24.85 mi
9:52/mi
3:31:38
↓ 200.3%
25.2M
9:20/mi
3:34:51
↑ 13↓ 160.2%
Finish· 26.22 mi
7:42/mi
3:42:42
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:46:30
Pace8:07 /mi
2nd Half
Distance13.11 mi
Time1:56:12
Pace8:52 /mi
📊Positive Split: 9.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:1824:327:5424:32
7:54
-
10K
6.21 mi11:16:3749:518:0125:19
8:09
+0:15
15K
9.32 mi11:42:091:15:238:0525:32
8:13
+0:04
20K
12.43 mi12:07:441:40:588:0725:35
8:14
+0:01
Half
13.11 mi12:13:161:46:308:075:32
8:07
-0:07
25K
15.53 mi12:33:462:07:008:1120:30
8:27
+0:20
30K
18.64 mi13:01:282:34:428:1827:42
8:55
+0:28
20M
20.00 mi13:13:152:46:298:1911:47
8:40
-0:15
21M
21.00 mi13:23:132:56:278:249:58
9:58
+1:18
35K
21.75 mi13:29:523:03:068:256:39
8:53
-1:05
23M
23.00 mi13:41:213:14:358:2811:29
9:10
+0:17
24M
24.00 mi13:49:583:23:128:288:37
8:37
-0:33
40K
24.85 mi13:58:243:31:388:318:26
9:52
+1:15
25.2M
25.20 mi14:01:373:34:518:323:13
9:20
-0:32
Finish
26.22 mi14:09:283:42:428:307:51
7:42
-1:38

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

7:42 /mi

Average Pace

8:30 /mi

Slowest Pace

9:58 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:54:21

51% of race

Time at Steady Pace

1:15:15

34% of race

Time at Slower Pace

33:06

15% of race

Average Pace: 8:30 /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 mi10:51:1824:327:5424:32
7:54
#15676
10K
6.21 mi11:16:3749:518:0125:19
8:09
#16704
15K
9.32 mi11:42:091:15:238:0525:32
8:13
#16991
20K
12.43 mi12:07:441:40:588:0725:35
8:14
#16858
Half
13.11 mi12:13:161:46:308:075:32
8:07
#16843
25K
15.53 mi12:33:462:07:008:1120:30
8:27
#16810
30K
18.64 mi13:01:282:34:428:1827:42
8:55
#16835
20M
20.00 mi13:13:152:46:298:1911:47
8:40
#16666
21M
21.00 mi13:23:132:56:278:249:58
9:58
#16726
35K
21.75 mi13:29:523:03:068:256:39
8:53
#16748
23M
23.00 mi13:41:213:14:358:2811:29
9:10
#16752
24M
24.00 mi13:49:583:23:128:288:37
8:37
#16672
40K
24.85 mi13:58:243:31:388:318:26
9:52
#16840
25.2M
25.20 mi14:01:373:34:518:323:13
9:20
#16773
Finish
26.22 mi14:09:283:42:428:307:51
7:42
#16546
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi156764943494317512(Top 62%)6020(Top 49%)6020(Top 110%)
10K6.21 mi3.10 mi16704-10285556-6135556-61317548(Top 62%)6029(Top 49%)6029(Top 110%)
15K9.32 mi3.11 mi16991-2875708-1525708-15217512(Top 62%)6020(Top 49%)6020(Top 110%)
20K12.43 mi3.11 mi16858+1335654+545654+5416543(Top 58%)5517(Top 45%)5517(Top 101%)
Half13.11 mi0.68 mi16843+155637+175637+1716742(Top 59%)5617(Top 46%)5617(Top 103%)
25K15.53 mi2.42 mi16810+335651-145651-1416917(Top 60%)5806(Top 47%)5806(Top 106%)
30K18.64 mi3.11 mi16835-255719-685719-6817242(Top 61%)6154(Top 50%)6154(Top 113%)
20M20.00 mi1.36 mi16666+1695642+775642+7714899(Top 52%)4993(Top 41%)4993(Top 91%)
21M21.00 mi1.00 mi16726-605715-735715-7318178(Top 64%)6882(Top 56%)6882(Top 126%)
35K21.75 mi0.75 mi16748-225742-275742-2717714(Top 62%)6738(Top 55%)6738(Top 123%)
23M23.00 mi1.25 mi16752-45783-415783-4117204(Top 61%)6557(Top 54%)6557(Top 120%)
24M24.00 mi1.00 mi16672+805759+245759+2415290(Top 54%)5540(Top 45%)5540(Top 101%)
40K24.85 mi0.85 mi16840-1685899-1405899-14020000(Top 70%)8154(Top 67%)8154(Top 149%)
25.2M25.20 mi0.35 mi16773+675873+265873+2613699(Top 48%)4879(Top 40%)4879(Top 89%)
Finish26.22 mi1.02 mi16546+2275756+1175756+11710777(Top 38%)3371(Top 28%)3371(Top 62%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 62%
×21story building
+97ft-345ft

Overall

17512

Females

6020

F18-39

6020

5K→10K

3.1 - 6.2 mi

Top 62%
×5story building
+79ft-138ft

Overall

17548

Females

6029

F18-39

6029

10K→15K

6.2 - 9.3 mi

Top 62%
×3story building
+67ft-78ft

Overall

17512

Females

6020

F18-39

6020

15K→20K

9.3 - 12.4 mi

Top 58%
×5story building
+106ft-86ft

Overall

16543

Females

5517

F18-39

5517

20K→Half

12.4 - 13.1 mi

Top 59%
×2story building
+19ft-37ft

Overall

16742

Females

5617

F18-39

5617

Half→25K

13.1 - 15.5 mi

Top 60%
×4story building
+66ft-88ft

Overall

16917

Females

5806

F18-39

5806

25K→30K

15.5 - 18.6 mi

Top 61%
×9story building
+181ft-148ft

Overall

17242

Females

6154

F18-39

6154

30K→20M

18.6 - 20.0 mi

Top 52%
×5story building
+64ft-50ft

Overall

14899

Females

4993

F18-39

4993

20M→21M

20.0 - 21.0 mi

Top 64%
×8story building
+106ft-24ft

Overall

18178

Females

6882

F18-39

6882

21M→35K

21.0 - 21.8 mi

Top 62%
×7story building
+17ft-86ft

Overall

17714

Females

6738

F18-39

6738

35K→23M

21.8 - 23.0 mi

Top 61%
×5story building
+23ft-63ft

Overall

17204

Females

6557

F18-39

6557

23M→24M

23.0 - 24.0 mi

Top 54%
×6story building
+12ft-82ft

Overall

15290

Females

5540

F18-39

5540

24M→40K

24.0 - 24.9 mi

Top 70%
×1story
+6ft-20ft

Overall

20000

Females

8154

F18-39

8154

40K→25.2M

24.9 - 25.2 mi

Top 48%
×1story
+13ft-16ft

Overall

13699

Females

4879

F18-39

4879

25.2M→Finish

25.2 - 26.2 mi

Top 38%
×2story building
+22ft-21ft

Overall

10777

Females

3371

F18-39

3371

Passing Analysis

Category:
Athletes Passed
1796
Passed By
2666
Net Change
-870
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15676
5K → 10K621090-1028#15676#16704
10K → 15K125412-287#16704#16991
15K → 20K254121+133#16991#16858
20K → Half4429+15#16858#16843
Half → 25K175142+33#16843#16810
25K → 30K211236-25#16810#16835
30K → 20M19526+169#16835#16666
20M → 21M89149-60#16666#16726
21M → 35K5577-22#16726#16748
35K → 23M113117-4#16748#16752
23M → 24M12141+80#16752#16672
24M → 40K43211-168#16672#16840
40K → 25.2M758+67#16840#16773
25.2M → Finish2347+227#16773#16546
TOTALS17962666-870
📊

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