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BOSTON MARATHON 2025

Cathy Khuu

Bib: 18523•F

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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

Start
0:00:00
Race begins
5K· 3.11 mi
26:37
Rank: #20289
Start → 5K
26:37 | 8:34/mi
10K· 6.21 mi
53:01
Rank: #20030 (+259)
5K → 10K
26:24 | 8:30/mi
15K· 9.32 mi
1:19:17
Rank: #19701 (+329)
10K → 15K
26:16 | 8:27/mi
20K· 12.43 mi
1:45:44
Rank: #19321 (+380)
15K → 20K
26:27 | 8:31/mi
Half· 13.11 mi
1:51:30
Rank: #19297 (+24)
20K → Half
5:46 | 8:27/mi
25K· 15.53 mi
2:12:16
Rank: #18992 (+305)
Half → 25K
20:46 | 8:34/mi
30K· 18.64 mi
2:39:26
Rank: #18464 (+528)
25K → 30K
27:10 | 8:45/mi
20M
2:51:24
Rank: #18229 (+235)
30K → 20M
11:58 | 8:48/mi
21M
3:00:40
Rank: #18033 (+196)
20M → 21M
9:16 | 9:16/mi
35K· 21.75 mi
3:07:07
Rank: #17961 (+72)
21M → 35K
6:27 | 8:37/mi
23M
3:18:07
Rank: #17747 (+214)
35K → 23M
11:00 | 8:47/mi
24M
3:26:53
Rank: #17656 (+91)
23M → 24M
8:46 | 8:46/mi
40K· 24.85 mi
3:34:26
Rank: #17565 (+91)
24M → 40K
7:33 | 8:50/mi
25.2M
3:37:39
Rank: #17504 (+61)
40K → 25.2M
3:13 | 9:20/mi
Finish· 26.22 mi
3:46:17
Rank: #17445 (+59)
25.2M → Finish
8:38 | 8:28/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:51:30
Pace8:30 /mi
2nd Half
Distance13.11 mi
Time1:54:47
Pace8:45 /mi
📊Positive Split: 2.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:21:0526:378:3426:37
8:34
-
10K
6.21 mi11:47:2953:018:3226:24
8:30
-0:04
15K
9.32 mi12:13:451:19:178:3026:16
8:27
-0:03
20K
12.43 mi12:40:121:45:448:3026:27
8:31
+0:04
Half
13.11 mi12:45:581:51:308:305:46
8:27
-0:04
25K
15.53 mi13:06:442:12:168:3120:46
8:34
+0:07
30K
18.64 mi13:33:542:39:268:3327:10
8:45
+0:11
20M
20.00 mi13:45:522:51:248:3411:58
8:48
+0:03
21M
21.00 mi13:55:083:00:408:369:16
9:16
+0:28
35K
21.75 mi14:01:353:07:078:366:27
8:37
-0:39
23M
23.00 mi14:12:353:18:078:3711:00
8:47
+0:10
24M
24.00 mi14:21:213:26:538:378:46
8:46
-0:01
40K
24.85 mi14:28:543:34:268:387:33
8:50
+0:04
25.2M
25.20 mi14:32:073:37:398:383:13
9:20
+0:30
Finish
26.22 mi14:40:453:46:178:388:38
8:28
-0:52

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

8:27 /mi

Average Pace

8:38 /mi

Slowest Pace

9:20 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:43:04

99% of race

Time at Steady Pace

3:13

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:38 /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 mi11:21:0526:378:3426:37
8:34
#20289
10K
6.21 mi11:47:2953:018:3226:24
8:30
#20030
15K
9.32 mi12:13:451:19:178:3026:16
8:27
#19701
20K
12.43 mi12:40:121:45:448:3026:27
8:31
#19321
Half
13.11 mi12:45:581:51:308:305:46
8:27
#19297
25K
15.53 mi13:06:442:12:168:3120:46
8:34
#18992
30K
18.64 mi13:33:542:39:268:3327:10
8:45
#18464
20M
20.00 mi13:45:522:51:248:3411:58
8:48
#18229
21M
21.00 mi13:55:083:00:408:369:16
9:16
#18033
35K
21.75 mi14:01:353:07:078:366:27
8:37
#17961
23M
23.00 mi14:12:353:18:078:3711:00
8:47
#17747
24M
24.00 mi14:21:213:26:538:378:46
8:46
#17656
40K
24.85 mi14:28:543:34:268:387:33
8:50
#17565
25.2M
25.20 mi14:32:073:37:398:383:13
9:20
#17504
Finish
26.22 mi14:40:453:46:178:388:38
8:28
#17445
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi202897674767419063(Top 67%)6934(Top 57%)6934(Top 127%)
10K6.21 mi3.10 mi20030+2597484+1907484+19019788(Top 70%)7350(Top 60%)7350(Top 134%)
15K9.32 mi3.11 mi19701+3297292+1927292+19219063(Top 67%)6934(Top 57%)6934(Top 127%)
20K12.43 mi3.11 mi19321+3807093+1997093+19918344(Top 65%)6532(Top 53%)6532(Top 119%)
Half13.11 mi0.68 mi19297+247079+147079+1418914(Top 67%)6837(Top 56%)6837(Top 125%)
25K15.53 mi2.42 mi18992+3056912+1676912+16717590(Top 62%)6185(Top 51%)6185(Top 113%)
30K18.64 mi3.11 mi18464+5286643+2696643+26916273(Top 57%)5621(Top 46%)5621(Top 103%)
20M20.00 mi1.36 mi18229+2356546+976546+9715729(Top 55%)5442(Top 45%)5442(Top 100%)
21M21.00 mi1.00 mi18033+1966452+946452+9415003(Top 53%)5186(Top 42%)5186(Top 95%)
35K21.75 mi0.75 mi17961+726425+276425+2716228(Top 57%)5913(Top 48%)5913(Top 108%)
23M23.00 mi1.25 mi17747+2146356+696356+6915060(Top 53%)5372(Top 44%)5372(Top 98%)
24M24.00 mi1.00 mi17656+916333+236333+2316152(Top 57%)6021(Top 49%)6021(Top 110%)
40K24.85 mi0.85 mi17565+916312+216312+2115391(Top 54%)5748(Top 47%)5748(Top 105%)
25.2M25.20 mi0.35 mi17504+616295+176295+1713714(Top 48%)4894(Top 40%)4894(Top 89%)
Finish26.22 mi1.02 mi17445+596281+146281+1416063(Top 57%)6058(Top 50%)6058(Top 111%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 67%
×21stories
+97ft-345ft

Overall

19063

Females

6934

F18-39

6934

5K→10K

3.1 - 6.2 mi

Top 70%
×5stories
+79ft-138ft

Overall

19788

Females

7350

F18-39

7350

10K→15K

6.2 - 9.3 mi

Top 67%
×3stories
+67ft-78ft

Overall

19063

Females

6934

F18-39

6934

15K→20K

9.3 - 12.4 mi

Top 65%
×5stories
+106ft-86ft

Overall

18344

Females

6532

F18-39

6532

20K→Half

12.4 - 13.1 mi

Top 67%
×2stories
+19ft-37ft

Overall

18914

Females

6837

F18-39

6837

Half→25K

13.1 - 15.5 mi

Top 62%
×4stories
+66ft-88ft

Overall

17590

Females

6185

F18-39

6185

25K→30K

15.5 - 18.6 mi

Top 57%
×9stories
+181ft-148ft

Overall

16273

Females

5621

F18-39

5621

30K→20M

18.6 - 20.0 mi

Top 55%
×5stories
+64ft-50ft

Overall

15729

Females

5442

F18-39

5442

20M→21M

20.0 - 21.0 mi

Top 53%
×8stories
+106ft-24ft

Overall

15003

Females

5186

F18-39

5186

21M→35K

21.0 - 21.8 mi

Top 57%
×7stories
+17ft-86ft

Overall

16228

Females

5913

F18-39

5913

35K→23M

21.8 - 23.0 mi

Top 53%
×5stories
+23ft-63ft

Overall

15060

Females

5372

F18-39

5372

23M→24M

23.0 - 24.0 mi

Top 57%
×6stories
+12ft-82ft

Overall

16152

Females

6021

F18-39

6021

24M→40K

24.0 - 24.9 mi

Top 54%
×1story
+6ft-20ft

Overall

15391

Females

5748

F18-39

5748

40K→25.2M

24.9 - 25.2 mi

Top 48%
×1story
+13ft-16ft

Overall

13714

Females

4894

F18-39

4894

25.2M→Finish

25.2 - 26.2 mi

Top 57%
×2stories
+22ft-21ft

Overall

16063

Females

6058

F18-39

6058

Passing Analysis

Category:
Athletes Passed
3365
Passed By
521
Net Change
+2844
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20289
5K → 10K437178+259#20289#20030
10K → 15K38455+329#20030#19701
15K → 20K42646+380#19701#19321
20K → Half4622+24#19321#19297
Half → 25K34237+305#19297#18992
25K → 30K55729+528#18992#18464
30K → 20M25015+235#18464#18229
20M → 21M21317+196#18229#18033
21M → 35K9018+72#18033#17961
35K → 23M23016+214#17961#17747
23M → 24M12130+91#17747#17656
24M → 40K11524+91#17656#17565
40K → 25.2M643+61#17565#17504
25.2M → Finish9031+59#17504#17445
TOTALS3365521+2844
📊

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