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BOSTON MARATHON 2025

Kathryn Costa

Bib: 31100•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
10:50/mi
33:40
↑ 97↓ 3451.5%
10K· 6.21 mi
10:46/mi
1:07:08
↑ 79↓ 1380.4%
15K· 9.32 mi
11:18/mi
1:42:13
↑ 67↓ 78
20K· 12.43 mi
11:58/mi
2:19:24
↑ 106↓ 860.1%
Half· 13.11 mi
11:45/mi
2:27:25
↑ 19↓ 370.5%
25K· 15.53 mi
12:27/mi
2:57:36
↑ 66↓ 880.2%
30K· 18.64 mi
13:03/mi
3:38:10
↑ 181↓ 1480.2%
20M
13:15/mi
3:56:11
↑ 64↓ 500.2%
21M
13:46/mi
4:09:57
↑ 106↓ 241.6%
35K· 21.75 mi
12:30/mi
4:19:18
↑ 17↓ 861.7%
23M
12:31/mi
4:34:58
↑ 23↓ 630.6%
24M
12:23/mi
4:47:21
↓ 821.3%
40K· 24.85 mi
12:23/mi
4:57:56
↓ 200.3%
25.2M
11:30/mi
5:01:54
↑ 13↓ 160.2%
Finish· 26.22 mi
11:00/mi
5:13:07
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:27:25
Pace11:15 /mi
2nd Half
Distance13.11 mi
Time2:45:42
Pace12:38 /mi
📊Positive Split: 12.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:57:3233:4010:5033:40
10:50
-
10K
6.21 mi12:31:001:07:0810:4833:28
10:46
-0:04
15K
9.32 mi13:06:051:42:1310:5835:05
11:18
+0:32
20K
12.43 mi13:43:162:19:2411:1337:11
11:58
+0:40
Half
13.11 mi13:51:172:27:2511:158:01
11:45
-0:13
25K
15.53 mi14:21:282:57:3611:2630:11
12:27
+0:42
30K
18.64 mi15:02:023:38:1011:4240:34
13:03
+0:36
20M
20.00 mi15:20:033:56:1111:4918:01
13:15
+0:12
21M
21.00 mi15:33:494:09:5711:5413:46
13:46
+0:31
35K
21.75 mi15:43:104:19:1811:559:21
12:30
-1:16
23M
23.00 mi15:58:504:34:5811:5715:40
12:31
+0:01
24M
24.00 mi16:11:134:47:2111:5812:23
12:23
-0:08
40K
24.85 mi16:21:484:57:5611:5910:35
12:23
0:00
25.2M
25.20 mi16:25:465:01:5411:593:58
11:30
-0:53
Finish
26.22 mi16:36:595:13:0711:5711:13
11:00
-0:30

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

10:46 /mi

Average Pace

11:57 /mi

Slowest Pace

13:46 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:05:25

40% of race

Time at Steady Pace

1:55:21

37% of race

Time at Slower Pace

1:12:21

23% of race

Average Pace: 11:57 /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 mi11:57:3233:4010:5033:40
10:50
#27336
10K
6.21 mi12:31:001:07:0810:4833:28
10:46
#27035
15K
9.32 mi13:06:051:42:1310:5835:05
11:18
#27029
20K
12.43 mi13:43:162:19:2411:1337:11
11:58
#27057
Half
13.11 mi13:51:172:27:2511:158:01
11:45
#27071
25K
15.53 mi14:21:282:57:3611:2630:11
12:27
#27049
30K
18.64 mi15:02:023:38:1011:4240:34
13:03
#27019
20M
20.00 mi15:20:033:56:1111:4918:01
13:15
#27008
21M
21.00 mi15:33:494:09:5711:5413:46
13:46
#26977
35K
21.75 mi15:43:104:19:1811:559:21
12:30
#26979
23M
23.00 mi15:58:504:34:5811:5715:40
12:31
#26932
24M
24.00 mi16:11:134:47:2111:5812:23
12:23
#26890
40K
24.85 mi16:21:484:57:5611:5910:35
12:23
#26857
25.2M
25.20 mi16:25:465:01:5411:593:58
11:30
#26805
Finish
26.22 mi16:36:595:13:0711:5711:13
11:00
#26769
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi27336115301153027020(Top 95%)11386(Top 93%)11386(Top 208%)
10K6.21 mi3.10 mi27035+30111364+16611364+16626728(Top 94%)11188(Top 91%)11188(Top 205%)
15K9.32 mi3.11 mi27029+611372-811372-827020(Top 95%)11386(Top 93%)11386(Top 208%)
20K12.43 mi3.11 mi27057-2811400-2811400-2827088(Top 95%)11446(Top 94%)11446(Top 209%)
Half13.11 mi0.68 mi27071-1411415-1511415-1527256(Top 96%)11564(Top 95%)11564(Top 211%)
25K15.53 mi2.42 mi27049+2211413+211413+226884(Top 95%)11364(Top 93%)11364(Top 208%)
30K18.64 mi3.11 mi27019+3011404+911404+926737(Top 94%)11352(Top 93%)11352(Top 208%)
20M20.00 mi1.36 mi27008+1111407-311407-326683(Top 94%)11392(Top 93%)11392(Top 208%)
21M21.00 mi1.00 mi26977+3111399+811399+825957(Top 91%)11025(Top 90%)11025(Top 202%)
35K21.75 mi0.75 mi26979-211402-311402-326445(Top 93%)11303(Top 92%)11303(Top 207%)
23M23.00 mi1.25 mi26932+4711381+2111381+2125822(Top 91%)11014(Top 90%)11014(Top 201%)
24M24.00 mi1.00 mi26890+4211374+711374+726164(Top 92%)11203(Top 92%)11203(Top 205%)
40K24.85 mi0.85 mi26857+3311362+1211362+1225495(Top 90%)10906(Top 89%)10906(Top 199%)
25.2M25.20 mi0.35 mi26805+5211337+2511337+2521996(Top 77%)9168(Top 75%)9168(Top 168%)
Finish26.22 mi1.02 mi26769+3611322+1511322+1525369(Top 89%)10838(Top 89%)10838(Top 198%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 95%
×21story building
+97ft-345ft

Overall

27020

Females

11386

F18-39

11386

5K→10K

3.1 - 6.2 mi

Top 94%
×5story building
+79ft-138ft

Overall

26728

Females

11188

F18-39

11188

10K→15K

6.2 - 9.3 mi

Top 95%
×3story building
+67ft-78ft

Overall

27020

Females

11386

F18-39

11386

15K→20K

9.3 - 12.4 mi

Top 95%
×5story building
+106ft-86ft

Overall

27088

Females

11446

F18-39

11446

20K→Half

12.4 - 13.1 mi

Top 96%
×2story building
+19ft-37ft

Overall

27256

Females

11564

F18-39

11564

Half→25K

13.1 - 15.5 mi

Top 95%
×4story building
+66ft-88ft

Overall

26884

Females

11364

F18-39

11364

25K→30K

15.5 - 18.6 mi

Top 94%
×9story building
+181ft-148ft

Overall

26737

Females

11352

F18-39

11352

30K→20M

18.6 - 20.0 mi

Top 94%
×5story building
+64ft-50ft

Overall

26683

Females

11392

F18-39

11392

20M→21M

20.0 - 21.0 mi

Top 91%
×8story building
+106ft-24ft

Overall

25957

Females

11025

F18-39

11025

21M→35K

21.0 - 21.8 mi

Top 93%
×7story building
+17ft-86ft

Overall

26445

Females

11303

F18-39

11303

35K→23M

21.8 - 23.0 mi

Top 91%
×5story building
+23ft-63ft

Overall

25822

Females

11014

F18-39

11014

23M→24M

23.0 - 24.0 mi

Top 92%
×6story building
+12ft-82ft

Overall

26164

Females

11203

F18-39

11203

24M→40K

24.0 - 24.9 mi

Top 90%
×1story
+6ft-20ft

Overall

25495

Females

10906

F18-39

10906

40K→25.2M

24.9 - 25.2 mi

Top 77%
×1story
+13ft-16ft

Overall

21996

Females

9168

F18-39

9168

25.2M→Finish

25.2 - 26.2 mi

Top 89%
×2story building
+22ft-21ft

Overall

25369

Females

10838

F18-39

10838

Passing Analysis

Category:
Athletes Passed
1069
Passed By
502
Net Change
+567
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#27336
5K → 10K34342+301#27336#27035
10K → 15K114108+6#27035#27029
15K → 20K93121-28#27029#27057
20K → Half1327-14#27057#27071
Half → 25K7957+22#27071#27049
25K → 30K9060+30#27049#27019
30K → 20M4433+11#27019#27008
20M → 21M409+31#27008#26977
21M → 35K1012-2#26977#26979
35K → 23M5811+47#26979#26932
23M → 24M5311+42#26932#26890
24M → 40K385+33#26890#26857
40K → 25.2M520+52#26857#26805
25.2M → Finish426+36#26805#26769
TOTALS1069502+567
📊

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