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BOSTON MARATHON 2025

Kelsey O'Connor

Bib: 12578•F

FL

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
6:47/mi
21:04
↑ 97↓ 3451.5%
10K· 6.21 mi
7:01/mi
42:52
↑ 79↓ 1380.4%
15K· 9.32 mi
7:25/mi
1:05:55
↑ 67↓ 78
20K· 12.43 mi
8:17/mi
1:31:39
↑ 106↓ 860.1%
Half· 13.11 mi
8:15/mi
1:37:17
↑ 19↓ 370.5%
25K· 15.53 mi
9:12/mi
1:59:36
↑ 66↓ 880.2%
30K· 18.64 mi
10:04/mi
2:30:53
↑ 181↓ 1480.2%
20M
10:48/mi
2:45:34
↑ 64↓ 500.2%
21M
12:00/mi
2:57:34
↑ 106↓ 241.6%
35K· 21.75 mi
9:48/mi
3:04:54
↑ 17↓ 861.7%
23M
10:02/mi
3:17:28
↑ 23↓ 630.6%
24M
9:36/mi
3:27:04
↓ 821.3%
40K· 24.85 mi
10:04/mi
3:35:40
↓ 200.3%
25.2M
10:52/mi
3:39:25
↑ 13↓ 160.2%
Finish· 26.22 mi
9:30/mi
3:49:06
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:37:17
Pace7:25 /mi
2nd Half
Distance13.11 mi
Time2:11:49
Pace10:03 /mi
📊Positive Split: 35.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:49:3121:046:4721:04
6:47
-
10K
6.21 mi11:11:1942:526:5421:48
7:01
+0:14
15K
9.32 mi11:34:221:05:557:0423:03
7:25
+0:24
20K
12.43 mi12:00:061:31:397:2225:44
8:17
+0:52
Half
13.11 mi12:05:441:37:177:255:38
8:15
-0:02
25K
15.53 mi12:28:031:59:367:4222:19
9:12
+0:57
30K
18.64 mi12:59:202:30:538:0631:17
10:04
+0:52
20M
20.00 mi13:14:012:45:348:1714:41
10:48
+0:44
21M
21.00 mi13:26:012:57:348:2712:00
12:00
+1:12
35K
21.75 mi13:33:213:04:548:307:20
9:48
-2:12
23M
23.00 mi13:45:553:17:288:3512:34
10:02
+0:14
24M
24.00 mi13:55:313:27:048:389:36
9:36
-0:26
40K
24.85 mi14:04:073:35:408:418:36
10:04
+0:28
25.2M
25.20 mi14:07:523:39:258:423:45
10:52
+0:48
Finish
26.22 mi14:17:333:49:068:459:41
9:30
-1:22

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

6:47 /mi

Average Pace

8:45 /mi

Slowest Pace

12:00 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:37:17

42% of race

Time at Steady Pace

1:41:23

44% of race

Time at Slower Pace

30:26

13% of race

Average Pace: 8:44 /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 mi10:49:3121:046:4721:04
6:47
#6189
10K
6.21 mi11:11:1942:526:5421:48
7:01
#7157
15K
9.32 mi11:34:221:05:557:0423:03
7:25
#8293
20K
12.43 mi12:00:061:31:397:2225:44
8:17
#10547
Half
13.11 mi12:05:441:37:177:255:38
8:15
#10943
25K
15.53 mi12:28:031:59:367:4222:19
9:12
#13020
30K
18.64 mi12:59:202:30:538:0631:17
10:04
#15464
20M
20.00 mi13:14:012:45:348:1714:41
10:48
#16359
21M
21.00 mi13:26:012:57:348:2712:00
12:00
#17069
35K
21.75 mi13:33:213:04:548:307:20
9:48
#17289
23M
23.00 mi13:45:553:17:288:3512:34
10:02
#17574
24M
24.00 mi13:55:313:27:048:389:36
9:36
#17701
40K
24.85 mi14:04:073:35:408:418:36
10:04
#17871
25.2M
25.20 mi14:07:523:39:258:423:45
10:52
#17934
Finish
26.22 mi14:17:333:49:068:459:41
9:30
#18106
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi618950950911067(Top 39%)2412(Top 20%)2412(Top 44%)
10K6.21 mi3.10 mi7157-968733-224733-2248057(Top 28%)1036(Top 8%)1036(Top 19%)
15K9.32 mi3.11 mi8293-11361118-3851118-38511067(Top 39%)2412(Top 20%)2412(Top 44%)
20K12.43 mi3.11 mi10547-22542125-10072125-100716849(Top 59%)5693(Top 47%)5693(Top 104%)
Half13.11 mi0.68 mi10943-3962316-1912316-19117729(Top 62%)6183(Top 51%)6183(Top 113%)
25K15.53 mi2.42 mi13020-20773488-11723488-117220780(Top 73%)7961(Top 65%)7961(Top 146%)
30K18.64 mi3.11 mi15464-24444928-14404928-144021794(Top 77%)8665(Top 71%)8665(Top 158%)
20M20.00 mi1.36 mi16359-8955469-5415469-54123182(Top 82%)9511(Top 78%)9511(Top 174%)
21M21.00 mi1.00 mi17069-7105920-4515920-45123595(Top 83%)9809(Top 80%)9809(Top 179%)
35K21.75 mi0.75 mi17289-2206073-1536073-15321341(Top 75%)8687(Top 71%)8687(Top 159%)
23M23.00 mi1.25 mi17574-2856267-1946267-19420609(Top 73%)8353(Top 68%)8353(Top 153%)
24M24.00 mi1.00 mi17701-1276363-966363-9619992(Top 70%)8074(Top 66%)8074(Top 148%)
40K24.85 mi0.85 mi17871-1706473-1106473-11020650(Top 73%)8476(Top 69%)8476(Top 155%)
25.2M25.20 mi0.35 mi17934-636521-486521-4820271(Top 71%)8291(Top 68%)8291(Top 152%)
Finish26.22 mi1.02 mi18106-1726626-1056626-10521198(Top 75%)8754(Top 72%)8754(Top 160%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 39%
×21story building
+97ft-345ft

Overall

11067

Females

2412

F18-39

2412

5K→10K

3.1 - 6.2 mi

Top 28%
×5story building
+79ft-138ft

Overall

8057

Females

1036

F18-39

1036

10K→15K

6.2 - 9.3 mi

Top 39%
×3story building
+67ft-78ft

Overall

11067

Females

2412

F18-39

2412

15K→20K

9.3 - 12.4 mi

Top 59%
×5story building
+106ft-86ft

Overall

16849

Females

5693

F18-39

5693

20K→Half

12.4 - 13.1 mi

Top 62%
×2story building
+19ft-37ft

Overall

17729

Females

6183

F18-39

6183

Half→25K

13.1 - 15.5 mi

Top 73%
×4story building
+66ft-88ft

Overall

20780

Females

7961

F18-39

7961

25K→30K

15.5 - 18.6 mi

Top 77%
×9story building
+181ft-148ft

Overall

21794

Females

8665

F18-39

8665

30K→20M

18.6 - 20.0 mi

Top 82%
×5story building
+64ft-50ft

Overall

23182

Females

9511

F18-39

9511

20M→21M

20.0 - 21.0 mi

Top 83%
×8story building
+106ft-24ft

Overall

23595

Females

9809

F18-39

9809

21M→35K

21.0 - 21.8 mi

Top 75%
×7story building
+17ft-86ft

Overall

21341

Females

8687

F18-39

8687

35K→23M

21.8 - 23.0 mi

Top 73%
×5story building
+23ft-63ft

Overall

20609

Females

8353

F18-39

8353

23M→24M

23.0 - 24.0 mi

Top 70%
×6story building
+12ft-82ft

Overall

19992

Females

8074

F18-39

8074

24M→40K

24.0 - 24.9 mi

Top 73%
×1story
+6ft-20ft

Overall

20650

Females

8476

F18-39

8476

40K→25.2M

24.9 - 25.2 mi

Top 71%
×1story
+13ft-16ft

Overall

20271

Females

8291

F18-39

8291

25.2M→Finish

25.2 - 26.2 mi

Top 75%
×2story building
+22ft-21ft

Overall

21198

Females

8754

F18-39

8754

Passing Analysis

Category:
Athletes Passed
289
Passed By
12204
Net Change
-11917
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#6189
5K → 10K27995-968#6189#7157
10K → 15K91145-1136#7157#8293
15K → 20K92261-2254#8293#10547
20K → Half2398-396#10547#10943
Half → 25K112088-2077#10943#13020
25K → 30K182462-2444#13020#15464
30K → 20M14909-895#15464#16359
20M → 21M19729-710#16359#17069
21M → 35K26246-220#17069#17289
35K → 23M53338-285#17289#17574
23M → 24M42169-127#17574#17701
24M → 40K22192-170#17701#17871
40K → 25.2M1275-63#17871#17934
25.2M → Finish25197-172#17934#18106
TOTALS28912204-11917
📊

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