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BOSTON MARATHON 2025

Laura Kern

Bib: 23262•F

CA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F45-49)
#0 / 1813
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
26:21
Rank: #19795
Start → 5K
26:21 | 8:29/mi
10K· 6.21 mi
53:20
Rank: #20312 (-517)
5K → 10K
26:59 | 8:41/mi
15K· 9.32 mi
1:20:57
Rank: #20682 (-370)
10K → 15K
27:37 | 8:53/mi
20K· 12.43 mi
1:49:02
Rank: #20789 (-107)
15K → 20K
28:05 | 9:02/mi
Half· 13.11 mi
1:55:09
Rank: #20841 (-52)
20K → Half
6:07 | 8:58/mi
25K· 15.53 mi
2:17:08
Rank: #20757 (+84)
Half → 25K
21:59 | 9:04/mi
30K· 18.64 mi
2:46:19
Rank: #20490 (+267)
25K → 30K
29:11 | 9:24/mi
20M
2:59:14
Rank: #20375 (+115)
30K → 20M
12:55 | 9:30/mi
21M
3:09:20
Rank: #20275 (+100)
20M → 21M
10:06 | 10:06/mi
35K· 21.75 mi
3:16:13
Rank: #20226 (+49)
21M → 35K
6:53 | 9:12/mi
23M
3:27:53
Rank: #20103 (+123)
35K → 23M
11:40 | 9:19/mi
24M
3:36:56
Rank: #19993 (+110)
23M → 24M
9:03 | 9:03/mi
40K· 24.85 mi
3:44:44
Rank: #19878 (+115)
24M → 40K
7:48 | 9:07/mi
25.2M
3:48:10
Rank: #19836 (+42)
40K → 25.2M
3:26 | 9:57/mi
Finish· 26.22 mi
3:56:56
Rank: #19727 (+109)
25.2M → Finish
8:46 | 8:36/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:55:09
Pace8:47 /mi
2nd Half
Distance13.11 mi
Time2:01:47
Pace9:17 /mi
📊Positive Split: 5.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:22:4926:218:2926:21
8:29
-
10K
6.21 mi11:49:4853:208:3526:59
8:41
+0:12
15K
9.32 mi12:17:251:20:578:4127:37
8:53
+0:12
20K
12.43 mi12:45:301:49:028:4628:05
9:02
+0:09
Half
13.11 mi12:51:371:55:098:476:07
8:58
-0:04
25K
15.53 mi13:13:362:17:088:5021:59
9:04
+0:06
30K
18.64 mi13:42:472:46:198:5529:11
9:24
+0:20
20M
20.00 mi13:55:422:59:148:5812:55
9:30
+0:06
21M
21.00 mi14:05:483:09:209:0110:06
10:06
+0:36
35K
21.75 mi14:12:413:16:139:016:53
9:12
-0:54
23M
23.00 mi14:24:213:27:539:0211:40
9:19
+0:07
24M
24.00 mi14:33:243:36:569:029:03
9:03
-0:16
40K
24.85 mi14:41:123:44:449:037:48
9:07
+0:04
25.2M
25.20 mi14:44:383:48:109:033:26
9:57
+0:50
Finish
26.22 mi14:53:243:56:569:038:46
8:36
-1:21

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

8:29 /mi

Average Pace

9:03 /mi

Slowest Pace

10:06 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:01:18

77% of race

Time at Steady Pace

45:32

19% of race

Time at Slower Pace

10:06

4% 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 mi11:22:4926:218:2926:21
8:29
#19795
10K
6.21 mi11:49:4853:208:3526:59
8:41
#20312
15K
9.32 mi12:17:251:20:578:4127:37
8:53
#20682
20K
12.43 mi12:45:301:49:028:4628:05
9:02
#20789
Half
13.11 mi12:51:371:55:098:476:07
8:58
#20841
25K
15.53 mi13:13:362:17:088:5021:59
9:04
#20757
30K
18.64 mi13:42:472:46:198:5529:11
9:24
#20490
20M
20.00 mi13:55:422:59:148:5812:55
9:30
#20375
21M
21.00 mi14:05:483:09:209:0110:06
10:06
#20275
35K
21.75 mi14:12:413:16:139:016:53
9:12
#20226
23M
23.00 mi14:24:213:27:539:0211:40
9:19
#20103
24M
24.00 mi14:33:243:36:569:029:03
9:03
#19993
40K
24.85 mi14:41:123:44:449:037:48
9:07
#19878
25.2M
25.20 mi14:44:383:48:109:033:26
9:57
#19836
Finish
26.22 mi14:53:243:56:569:038:46
8:36
#19727
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi197957391739121523(Top 76%)8290(Top 68%)8290(Top 457%)
10K6.21 mi3.10 mi20312-5177654-2637654-26320797(Top 73%)7916(Top 65%)7916(Top 437%)
15K9.32 mi3.11 mi20682-3707854-2007854-20021523(Top 76%)8290(Top 68%)8290(Top 457%)
20K12.43 mi3.11 mi20789-1077921-677921-6721172(Top 75%)8141(Top 67%)8141(Top 449%)
Half13.11 mi0.68 mi20841-527946-257946-2521685(Top 76%)8404(Top 69%)8404(Top 464%)
25K15.53 mi2.42 mi20757+847908+387908+3820215(Top 71%)7654(Top 63%)7654(Top 422%)
30K18.64 mi3.11 mi20490+2677812+967812+9619512(Top 69%)7398(Top 61%)7398(Top 408%)
20M20.00 mi1.36 mi20375+1157763+497763+4919213(Top 68%)7378(Top 60%)7378(Top 407%)
21M21.00 mi1.00 mi20275+1007735+287735+2818694(Top 66%)7176(Top 59%)7176(Top 396%)
35K21.75 mi0.75 mi20226+497721+147721+1419198(Top 68%)7558(Top 62%)7558(Top 417%)
23M23.00 mi1.25 mi20103+1237681+407681+4017879(Top 63%)6936(Top 57%)6936(Top 383%)
24M24.00 mi1.00 mi19993+1107637+447637+4417645(Top 62%)6850(Top 56%)6850(Top 378%)
40K24.85 mi0.85 mi19878+1157593+447593+4417020(Top 60%)6603(Top 54%)6603(Top 364%)
25.2M25.20 mi0.35 mi19836+427576+177576+1716910(Top 60%)6564(Top 54%)6564(Top 362%)
Finish26.22 mi1.02 mi19727+1097531+457531+4516897(Top 59%)6519(Top 53%)6519(Top 360%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 76%
×21stories
+97ft-345ft

Overall

21523

Females

8290

F45-49

8290

5K→10K

3.1 - 6.2 mi

Top 73%
×5stories
+79ft-138ft

Overall

20797

Females

7916

F45-49

7916

10K→15K

6.2 - 9.3 mi

Top 76%
×3stories
+67ft-78ft

Overall

21523

Females

8290

F45-49

8290

15K→20K

9.3 - 12.4 mi

Top 75%
×5stories
+106ft-86ft

Overall

21172

Females

8141

F45-49

8141

20K→Half

12.4 - 13.1 mi

Top 76%
×2stories
+19ft-37ft

Overall

21685

Females

8404

F45-49

8404

Half→25K

13.1 - 15.5 mi

Top 71%
×4stories
+66ft-88ft

Overall

20215

Females

7654

F45-49

7654

25K→30K

15.5 - 18.6 mi

Top 69%
×9stories
+181ft-148ft

Overall

19512

Females

7398

F45-49

7398

30K→20M

18.6 - 20.0 mi

Top 68%
×5stories
+64ft-50ft

Overall

19213

Females

7378

F45-49

7378

20M→21M

20.0 - 21.0 mi

Top 66%
×8stories
+106ft-24ft

Overall

18694

Females

7176

F45-49

7176

21M→35K

21.0 - 21.8 mi

Top 68%
×7stories
+17ft-86ft

Overall

19198

Females

7558

F45-49

7558

35K→23M

21.8 - 23.0 mi

Top 63%
×5stories
+23ft-63ft

Overall

17879

Females

6936

F45-49

6936

23M→24M

23.0 - 24.0 mi

Top 62%
×6stories
+12ft-82ft

Overall

17645

Females

6850

F45-49

6850

24M→40K

24.0 - 24.9 mi

Top 60%
×1story
+6ft-20ft

Overall

17020

Females

6603

F45-49

6603

40K→25.2M

24.9 - 25.2 mi

Top 60%
×1story
+13ft-16ft

Overall

16910

Females

6564

F45-49

6564

25.2M→Finish

25.2 - 26.2 mi

Top 59%
×2stories
+22ft-21ft

Overall

16897

Females

6519

F45-49

6519

Passing Analysis

Category:
Athletes Passed
1822
Passed By
1754
Net Change
+68
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19795
5K → 10K96613-517#19795#20312
10K → 15K91461-370#20312#20682
15K → 20K144251-107#20682#20789
20K → Half1062-52#20789#20841
Half → 25K196112+84#20841#20757
25K → 30K35285+267#20757#20490
30K → 20M15136+115#20490#20375
20M → 21M13939+100#20375#20275
21M → 35K7021+49#20275#20226
35K → 23M14219+123#20226#20103
23M → 24M12616+110#20103#19993
24M → 40K13520+115#19993#19878
40K → 25.2M497+42#19878#19836
25.2M → Finish12112+109#19836#19727
TOTALS18221754+68
📊

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