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BOSTON MARATHON 2025

Colleen Lau

BC

Bib: 15139 F

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 33%
Gender (Female)
#0 / 12228
Top 15%
Division (F18-39)
#0 / 5469
Top 28%
Race Day Weather
50°/40°F
broken clouds

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:24/mi
22:59
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:27/mi
46:07
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:28/mi
1:09:18
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:27/mi
1:32:27
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:21/mi
1:37:28
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:33/mi
1:55:46
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:41/mi
2:19:37
↑ 181↓ 1480.2%
138 ft elev
20M
7:42/mi
2:30:05
↑ 64↓ 500.2%
148 ft elev
21M
8:07/mi
2:38:12
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
7:14/mi
2:43:37
↑ 17↓ 861.7%
156 ft elev
23M
7:45/mi
2:53:19
↑ 23↓ 630.6%
116 ft elev
24M
7:37/mi
3:00:56
↓ 821.3%
34 ft elev
40K· 24.85 mi
7:10/mi
3:07:04
↓ 200.3%
20 ft elev
25.2M
8:10/mi
3:09:53
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
7:16/mi
3:17:17
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:37:287:26 /mi⚡ faster
2nd Half
1:39:497:37 /mi+2.4%
Positive split — 2.4% slower in the second half
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:55:0422:597:2422:59
7:24
-
10K
6.21 mi11:18:1246:077:2523:08
7:27
+0:03
15K
9.32 mi11:41:231:09:187:2623:11
7:28
+0:01
20K
12.43 mi12:04:321:32:277:2623:09
7:27
-0:01
Half
13.11 mi12:09:331:37:287:265:01
7:21
-0:06
25K
15.53 mi12:27:511:55:467:2718:18
7:33
+0:12
30K
18.64 mi12:51:422:19:377:2923:51
7:41
+0:08
20M
20.00 mi13:02:102:30:057:3010:28
7:42
+0:01
21M
21.00 mi13:10:172:38:127:328:07
8:07
+0:25
35K
21.75 mi13:15:422:43:377:315:25
7:14
-0:53
23M
23.00 mi13:25:242:53:197:329:42
7:45
+0:31
24M
24.00 mi13:33:013:00:567:327:37
7:37
-0:08
40K
24.85 mi13:39:093:07:047:326:08
7:10
-0:27
25.2M
25.20 mi13:41:583:09:537:322:49
8:10
+1:00
Finish
26.22 mi13:49:223:17:177:327:24
7:16
-0:54

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

7:10 /mi

Average Pace

7:32 /mi

Slowest Pace

8:10 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Segment Time Comparison

Time at Faster Pace

3:06:21

94% of race

Time at Steady Pace

10:56

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:31 /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 mi10:55:0422:597:2422:59
7:24
#11306
10K
6.21 mi11:18:1246:077:2523:08
7:27
#11437
15K
9.32 mi11:41:231:09:187:2623:11
7:28
#11404
20K
12.43 mi12:04:321:32:277:2623:09
7:27
#11116
Half
13.11 mi12:09:331:37:287:265:01
7:21
#11081
25K
15.53 mi12:27:511:55:467:2718:18
7:33
#10916
30K
18.64 mi12:51:422:19:377:2923:51
7:41
#10495
20M
20.00 mi13:02:102:30:057:3010:28
7:42
#10283
21M
21.00 mi13:10:172:38:127:328:07
8:07
#10115
35K
21.75 mi13:15:422:43:377:315:25
7:14
#9935
23M
23.00 mi13:25:242:53:197:329:42
7:45
#9798
24M
24.00 mi13:33:013:00:567:327:37
7:37
#9714
40K
24.85 mi13:39:093:07:047:326:08
7:10
#9468
25.2M
25.20 mi13:41:583:09:537:322:49
8:10
#9393
Finish
26.22 mi13:49:223:17:177:327:24
7:16
#9296
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi11306242924291144425982598
10K6.21 mi3.10 mi11437-1312519-902519-901160926122612
15K9.32 mi3.11 mi11404+332529-102529-101144425982598
20K12.43 mi3.11 mi11116+2882406+1232406+1231035921332133
Half13.11 mi0.68 mi11081+352384+222384+221051321782178
25K15.53 mi2.42 mi10916+1652344+402344+401035322572257
30K18.64 mi3.11 mi10495+4212205+1392205+139904518581858
20M20.00 mi1.36 mi10283+2122135+702135+70838117021702
21M21.00 mi1.00 mi10115+1682093+422093+42808217641764
35K21.75 mi0.75 mi9935+1802029+642029+64691312641264
23M23.00 mi1.25 mi9798+1372005+242005+24824019211921
24M24.00 mi1.00 mi9714+841998+71998+7855521172117
40K24.85 mi0.85 mi9468+2461916+821916+824956770770
25.2M25.20 mi0.35 mi9393+751902+141902+14695616281628
Finish26.22 mi1.02 mi9296+971893+91893+9753218681868

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 40%
×21story building
+97ft-345ft

Overall

11444

Females

2598

F18-39

2598

5K→10K

3.1 - 6.2 mi

Top 41%
×5story building
+79ft-138ft

Overall

11609

Females

2612

F18-39

2612

10K→15K

6.2 - 9.3 mi

Top 40%
×3story building
+67ft-78ft

Overall

11444

Females

2598

F18-39

2598

15K→20K

9.3 - 12.4 mi

Top 36%
×5story building
+106ft-86ft

Overall

10359

Females

2133

F18-39

2133

20K→Half

12.4 - 13.1 mi

Top 37%
×2story building
+19ft-37ft

Overall

10513

Females

2178

F18-39

2178

Half→25K

13.1 - 15.5 mi

Top 36%
×4story building
+66ft-88ft

Overall

10353

Females

2257

F18-39

2257

25K→30K

15.5 - 18.6 mi

Top 32%
×9story building
+181ft-148ft

Overall

9045

Females

1858

F18-39

1858

30K→20M

18.6 - 20.0 mi

Top 30%
×5story building
+64ft-50ft

Overall

8381

Females

1702

F18-39

1702

20M→21M

20.0 - 21.0 mi

Top 28%
×8story building
+106ft-24ft

Overall

8082

Females

1764

F18-39

1764

21M→35K

21.0 - 21.8 mi

Top 24%
×7story building
+17ft-86ft

Overall

6913

Females

1264

F18-39

1264

35K→23M

21.8 - 23.0 mi

Top 29%
×5story building
+23ft-63ft

Overall

8240

Females

1921

F18-39

1921

23M→24M

23.0 - 24.0 mi

Top 30%
×6story building
+12ft-82ft

Overall

8555

Females

2117

F18-39

2117

24M→40K

24.0 - 24.9 mi

Top 17%
×1story
+6ft-20ft

Overall

4956

Females

770

F18-39

770

40K→25.2M

24.9 - 25.2 mi

Top 24%
×1story
+13ft-16ft

Overall

6956

Females

1628

F18-39

1628

25.2M→Finish

25.2 - 26.2 mi

Top 27%
×2story building
+22ft-21ft

Overall

7532

Females

1868

F18-39

1868

Passing Analysis

Category:
Athletes Passed
2863*
Passed By
853
Net Change
+2010
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11306
5K → 10K197328-131#11306#11437
10K → 15K200167+33#11437#11404
15K → 20K33648+288#11404#11116
20K → Half6126+35#11116#11081
Half → 25K24176+165#11081#10916
25K → 30K46746+421#10916#10495
30K → 20M24028+212#10495#10283
20M → 21M19123+168#10283#10115
21M → 35K185*5+180#10115#9935
35K → 23M17134+137#9935#9798
23M → 24M12036+84#9798#9714
24M → 40K2460+246#9714#9468
40K → 25.2M849+75#9468#9393
25.2M → Finish12427+97#9393#9296
TOTALS2863*853+2010

* Includes athletes who did not complete a segment (DNF/DNQ).

Passing Charts

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