Boston Marathon logo
BOSTON MARATHON 2025

Kristen O'Brien

Bib: 18564•F

WA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 47%
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
25:11
Rank: #17401
Start → 5K
25:11 | 8:06/mi
10K· 6.21 mi
49:48
Rank: #16639 (+762)
5K → 10K
24:37 | 7:55/mi
15K· 9.32 mi
1:15:24
Rank: #17011 (-372)
10K → 15K
25:36 | 8:14/mi
20K· 12.43 mi
1:41:30
Rank: #17138 (-127)
15K → 20K
26:06 | 8:24/mi
Half· 13.11 mi
1:47:08
Rank: #17146 (-8)
20K → Half
5:38 | 8:15/mi
25K· 15.53 mi
2:07:43
Rank: #17084 (+62)
Half → 25K
20:35 | 8:29/mi
30K· 18.64 mi
2:35:23
Rank: #17059 (+25)
25K → 30K
27:40 | 8:54/mi
20M
2:47:52
Rank: #17089 (-30)
30K → 20M
12:29 | 9:11/mi
21M
2:57:30
Rank: #17038 (+51)
20M → 21M
9:38 | 9:38/mi
35K· 21.75 mi
3:04:01
Rank: #17021 (+17)
21M → 35K
6:31 | 8:43/mi
23M
3:15:06
Rank: #16897 (+124)
35K → 23M
11:05 | 8:51/mi
24M
3:23:50
Rank: #16846 (+51)
23M → 24M
8:44 | 8:44/mi
40K· 24.85 mi
3:31:15
Rank: #16736 (+110)
24M → 40K
7:25 | 8:40/mi
25.2M
3:34:27
Rank: #16681 (+55)
40K → 25.2M
3:12 | 9:17/mi
Finish· 26.22 mi
3:42:49
Rank: #16578 (+103)
25.2M → Finish
8:22 | 8:13/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:08
Pace8:10 /mi
2nd Half
Distance13.11 mi
Time1:55:41
Pace8:49 /mi
📊Positive Split: 8.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:16:3825:118:0625:11
8:06
-
10K
6.21 mi11:41:1549:488:0124:37
7:55
-0:11
15K
9.32 mi12:06:511:15:248:0525:36
8:14
+0:19
20K
12.43 mi12:32:571:41:308:1026:06
8:24
+0:10
Half
13.11 mi12:38:351:47:088:105:38
8:15
-0:09
25K
15.53 mi12:59:102:07:438:1320:35
8:29
+0:14
30K
18.64 mi13:26:502:35:238:2027:40
8:54
+0:25
20M
20.00 mi13:39:192:47:528:2412:29
9:11
+0:17
21M
21.00 mi13:48:572:57:308:279:38
9:38
+0:27
35K
21.75 mi13:55:283:04:018:286:31
8:43
-0:55
23M
23.00 mi14:06:333:15:068:2911:05
8:51
+0:08
24M
24.00 mi14:15:173:23:508:308:44
8:44
-0:07
40K
24.85 mi14:22:423:31:158:307:25
8:40
-0:04
25.2M
25.20 mi14:25:543:34:278:313:12
9:17
+0:37
Finish
26.22 mi14:34:163:42:498:308:22
8:13
-1:04

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

7:55 /mi

Average Pace

8:30 /mi

Slowest Pace

9:38 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:55:30

52% of race

Time at Steady Pace

54:20

24% of race

Time at Slower Pace

52:59

24% 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 mi11:16:3825:118:0625:11
8:06
#17401
10K
6.21 mi11:41:1549:488:0124:37
7:55
#16639
15K
9.32 mi12:06:511:15:248:0525:36
8:14
#17011
20K
12.43 mi12:32:571:41:308:1026:06
8:24
#17138
Half
13.11 mi12:38:351:47:088:105:38
8:15
#17146
25K
15.53 mi12:59:102:07:438:1320:35
8:29
#17084
30K
18.64 mi13:26:502:35:238:2027:40
8:54
#17059
20M
20.00 mi13:39:192:47:528:2412:29
9:11
#17089
21M
21.00 mi13:48:572:57:308:279:38
9:38
#17038
35K
21.75 mi13:55:283:04:018:286:31
8:43
#17021
23M
23.00 mi14:06:333:15:068:2911:05
8:51
#16897
24M
24.00 mi14:15:173:23:508:308:44
8:44
#16846
40K
24.85 mi14:22:423:31:158:307:25
8:40
#16736
25.2M
25.20 mi14:25:543:34:278:313:12
9:17
#16681
Finish
26.22 mi14:34:163:42:498:308:22
8:13
#16578
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi174015974597417662(Top 62%)6116(Top 50%)6116(Top 112%)
10K6.21 mi3.10 mi16639+7625518+4565518+45615866(Top 56%)5050(Top 41%)5050(Top 92%)
15K9.32 mi3.11 mi17011-3725722-2045722-20417662(Top 62%)6116(Top 50%)6116(Top 112%)
20K12.43 mi3.11 mi17138-1275823-1015823-10117559(Top 62%)6081(Top 50%)6081(Top 111%)
Half13.11 mi0.68 mi17146-85835-125835-1217679(Top 62%)6133(Top 50%)6133(Top 112%)
25K15.53 mi2.42 mi17084+625817+185817+1817137(Top 60%)5934(Top 49%)5934(Top 109%)
30K18.64 mi3.11 mi17059+255857-405857-4017189(Top 61%)6126(Top 50%)6126(Top 112%)
20M20.00 mi1.36 mi17089-305904-475904-4717731(Top 62%)6543(Top 54%)6543(Top 120%)
21M21.00 mi1.00 mi17038+515899+55899+516717(Top 59%)6099(Top 50%)6099(Top 112%)
35K21.75 mi0.75 mi17021+175912-135912-1316773(Top 59%)6197(Top 51%)6197(Top 113%)
23M23.00 mi1.25 mi16897+1245878+345878+3415428(Top 54%)5562(Top 45%)5562(Top 102%)
24M24.00 mi1.00 mi16846+515868+105868+1015950(Top 56%)5904(Top 48%)5904(Top 108%)
40K24.85 mi0.85 mi16736+1105834+345834+3414503(Top 51%)5248(Top 43%)5248(Top 96%)
25.2M25.20 mi0.35 mi16681+555812+225812+2213447(Top 47%)4756(Top 39%)4756(Top 87%)
Finish26.22 mi1.02 mi16578+1035772+405772+4014375(Top 51%)5148(Top 42%)5148(Top 94%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 62%
×21stories
+97ft-345ft

Overall

17662

Females

6116

F18-39

6116

5K→10K

3.1 - 6.2 mi

Top 56%
×5stories
+79ft-138ft

Overall

15866

Females

5050

F18-39

5050

10K→15K

6.2 - 9.3 mi

Top 62%
×3stories
+67ft-78ft

Overall

17662

Females

6116

F18-39

6116

15K→20K

9.3 - 12.4 mi

Top 62%
×5stories
+106ft-86ft

Overall

17559

Females

6081

F18-39

6081

20K→Half

12.4 - 13.1 mi

Top 62%
×2stories
+19ft-37ft

Overall

17679

Females

6133

F18-39

6133

Half→25K

13.1 - 15.5 mi

Top 60%
×4stories
+66ft-88ft

Overall

17137

Females

5934

F18-39

5934

25K→30K

15.5 - 18.6 mi

Top 61%
×9stories
+181ft-148ft

Overall

17189

Females

6126

F18-39

6126

30K→20M

18.6 - 20.0 mi

Top 62%
×5stories
+64ft-50ft

Overall

17731

Females

6543

F18-39

6543

20M→21M

20.0 - 21.0 mi

Top 59%
×8stories
+106ft-24ft

Overall

16717

Females

6099

F18-39

6099

21M→35K

21.0 - 21.8 mi

Top 59%
×7stories
+17ft-86ft

Overall

16773

Females

6197

F18-39

6197

35K→23M

21.8 - 23.0 mi

Top 54%
×5stories
+23ft-63ft

Overall

15428

Females

5562

F18-39

5562

23M→24M

23.0 - 24.0 mi

Top 56%
×6stories
+12ft-82ft

Overall

15950

Females

5904

F18-39

5904

24M→40K

24.0 - 24.9 mi

Top 51%
×1story
+6ft-20ft

Overall

14503

Females

5248

F18-39

5248

40K→25.2M

24.9 - 25.2 mi

Top 47%
×1story
+13ft-16ft

Overall

13447

Females

4756

F18-39

4756

25.2M→Finish

25.2 - 26.2 mi

Top 51%
×2stories
+22ft-21ft

Overall

14375

Females

5148

F18-39

5148

Passing Analysis

Category:
Athletes Passed
2458
Passed By
1635
Net Change
+823
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17401
5K → 10K83674+762#17401#16639
10K → 15K112484-372#16639#17011
15K → 20K150277-127#17011#17138
20K → Half2735-8#17138#17146
Half → 25K187125+62#17146#17084
25K → 30K235210+25#17084#17059
30K → 20M83113-30#17059#17089
20M → 21M14190+51#17089#17038
21M → 35K7558+17#17038#17021
35K → 23M17551+124#17021#16897
23M → 24M9948+51#16897#16846
24M → 40K13626+110#16846#16736
40K → 25.2M6510+55#16736#16681
25.2M → Finish13734+103#16681#16578
TOTALS24581635+823
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing