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BOSTON MARATHON 2025

Stephanie Shiau

Bib: 19539•F

NJ

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
8:32/mi
26:31
↑ 97↓ 3451.5%
10K· 6.21 mi
8:33/mi
53:04
↑ 79↓ 1380.4%
15K· 9.32 mi
8:26/mi
1:19:17
↑ 67↓ 78
20K· 12.43 mi
8:30/mi
1:45:42
↑ 106↓ 860.1%
Half· 13.11 mi
8:11/mi
1:51:17
↑ 19↓ 370.5%
25K· 15.53 mi
8:33/mi
2:12:00
↑ 66↓ 880.2%
30K· 18.64 mi
8:46/mi
2:39:14
↑ 181↓ 1480.2%
20M
8:42/mi
2:51:04
↑ 64↓ 500.2%
21M
9:17/mi
3:00:21
↑ 106↓ 241.6%
35K· 21.75 mi
8:27/mi
3:06:40
↑ 17↓ 861.7%
23M
8:42/mi
3:17:34
↑ 23↓ 630.6%
24M
8:27/mi
3:26:01
↓ 821.3%
40K· 24.85 mi
8:33/mi
3:33:20
↓ 200.3%
25.2M
9:28/mi
3:36:36
↑ 13↓ 160.2%
Finish· 26.22 mi
8:21/mi
3:45:07
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:51:17
Pace8:29 /mi
2nd Half
Distance13.11 mi
Time1:53:50
Pace8:41 /mi
📊Positive Split: 2.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:3026:318:3226:31
8:32
-
10K
6.21 mi11:46:0353:048:3226:33
8:33
+0:01
15K
9.32 mi12:12:161:19:178:3026:13
8:26
-0:07
20K
12.43 mi12:38:411:45:428:3026:25
8:30
+0:04
Half
13.11 mi12:44:161:51:178:295:35
8:11
-0:19
25K
15.53 mi13:04:592:12:008:3020:43
8:33
+0:22
30K
18.64 mi13:32:132:39:148:3327:14
8:46
+0:13
20M
20.00 mi13:44:032:51:048:3311:50
8:42
-0:04
21M
21.00 mi13:53:203:00:218:359:17
9:17
+0:35
35K
21.75 mi13:59:393:06:408:356:19
8:27
-0:50
23M
23.00 mi14:10:333:17:348:3510:54
8:42
+0:15
24M
24.00 mi14:19:003:26:018:358:27
8:27
-0:15
40K
24.85 mi14:26:193:33:208:357:19
8:33
+0:06
25.2M
25.20 mi14:29:353:36:368:363:16
9:28
+0:55
Finish
26.22 mi14:38:063:45:078:368:31
8:21
-1:07

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

8:11 /mi

Average Pace

8:36 /mi

Slowest Pace

9:28 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:32:34

94% of race

Time at Steady Pace

12:33

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:35 /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 mi11:19:3026:318:3226:31
8:32
#20097
10K
6.21 mi11:46:0353:048:3226:33
8:33
#20078
15K
9.32 mi12:12:161:19:178:3026:13
8:26
#19699
20K
12.43 mi12:38:411:45:428:3026:25
8:30
#19300
Half
13.11 mi12:44:161:51:178:295:35
8:11
#19190
25K
15.53 mi13:04:592:12:008:3020:43
8:33
#18882
30K
18.64 mi13:32:132:39:148:3327:14
8:46
#18395
20M
20.00 mi13:44:032:51:048:3311:50
8:42
#18121
21M
21.00 mi13:53:203:00:218:359:17
9:17
#17949
35K
21.75 mi13:59:393:06:408:356:19
8:27
#17819
23M
23.00 mi14:10:333:17:348:3510:54
8:42
#17600
24M
24.00 mi14:19:003:26:018:358:27
8:27
#17445
40K
24.85 mi14:26:193:33:208:357:19
8:33
#17293
25.2M
25.20 mi14:29:353:36:368:363:16
9:28
#17247
Finish
26.22 mi14:38:063:45:078:368:31
8:21
#17170
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi200977552755218957(Top 67%)6873(Top 56%)6873(Top 126%)
10K6.21 mi3.10 mi20078+197517+357517+3520069(Top 71%)7501(Top 61%)7501(Top 137%)
15K9.32 mi3.11 mi19699+3797290+2277290+22718957(Top 67%)6873(Top 56%)6873(Top 126%)
20K12.43 mi3.11 mi19300+3997079+2117079+21118268(Top 64%)6484(Top 53%)6484(Top 119%)
Half13.11 mi0.68 mi19190+1107018+617018+6117233(Top 61%)5898(Top 48%)5898(Top 108%)
25K15.53 mi2.42 mi18882+3086849+1696849+16917465(Top 61%)6121(Top 50%)6121(Top 112%)
30K18.64 mi3.11 mi18395+4876601+2486601+24816405(Top 58%)5692(Top 47%)5692(Top 104%)
20M20.00 mi1.36 mi18121+2746484+1176484+11715154(Top 53%)5134(Top 42%)5134(Top 94%)
21M21.00 mi1.00 mi17949+1726403+816403+8115102(Top 53%)5235(Top 43%)5235(Top 96%)
35K21.75 mi0.75 mi17819+1306343+606343+6015170(Top 53%)5332(Top 44%)5332(Top 97%)
23M23.00 mi1.25 mi17600+2196276+676276+6714617(Top 51%)5137(Top 42%)5137(Top 94%)
24M24.00 mi1.00 mi17445+1556215+616215+6114235(Top 50%)4954(Top 41%)4954(Top 91%)
40K24.85 mi0.85 mi17293+1526153+626153+6213843(Top 49%)4891(Top 40%)4891(Top 89%)
25.2M25.20 mi0.35 mi17247+466142+116142+1114533(Top 51%)5322(Top 44%)5322(Top 97%)
Finish26.22 mi1.02 mi17170+776118+246118+2415325(Top 54%)5658(Top 46%)5658(Top 103%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 67%
×21story building
+97ft-345ft

Overall

18957

Females

6873

F18-39

6873

5K→10K

3.1 - 6.2 mi

Top 71%
×5story building
+79ft-138ft

Overall

20069

Females

7501

F18-39

7501

10K→15K

6.2 - 9.3 mi

Top 67%
×3story building
+67ft-78ft

Overall

18957

Females

6873

F18-39

6873

15K→20K

9.3 - 12.4 mi

Top 64%
×5story building
+106ft-86ft

Overall

18268

Females

6484

F18-39

6484

20K→Half

12.4 - 13.1 mi

Top 61%
×2story building
+19ft-37ft

Overall

17233

Females

5898

F18-39

5898

Half→25K

13.1 - 15.5 mi

Top 61%
×4story building
+66ft-88ft

Overall

17465

Females

6121

F18-39

6121

25K→30K

15.5 - 18.6 mi

Top 58%
×9story building
+181ft-148ft

Overall

16405

Females

5692

F18-39

5692

30K→20M

18.6 - 20.0 mi

Top 53%
×5story building
+64ft-50ft

Overall

15154

Females

5134

F18-39

5134

20M→21M

20.0 - 21.0 mi

Top 53%
×8story building
+106ft-24ft

Overall

15102

Females

5235

F18-39

5235

21M→35K

21.0 - 21.8 mi

Top 53%
×7story building
+17ft-86ft

Overall

15170

Females

5332

F18-39

5332

35K→23M

21.8 - 23.0 mi

Top 51%
×5story building
+23ft-63ft

Overall

14617

Females

5137

F18-39

5137

23M→24M

23.0 - 24.0 mi

Top 50%
×6story building
+12ft-82ft

Overall

14235

Females

4954

F18-39

4954

24M→40K

24.0 - 24.9 mi

Top 49%
×1story
+6ft-20ft

Overall

13843

Females

4891

F18-39

4891

40K→25.2M

24.9 - 25.2 mi

Top 51%
×1story
+13ft-16ft

Overall

14533

Females

5322

F18-39

5322

25.2M→Finish

25.2 - 26.2 mi

Top 54%
×2story building
+22ft-21ft

Overall

15325

Females

5658

F18-39

5658

Passing Analysis

Category:
Athletes Passed
3477
Passed By
550
Net Change
+2927
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20097
5K → 10K289270+19#20097#20078
10K → 15K42849+379#20078#19699
15K → 20K43940+399#19699#19300
20K → Half1122+110#19300#19190
Half → 25K33123+308#19190#18882
25K → 30K52841+487#18882#18395
30K → 20M28612+274#18395#18121
20M → 21M19523+172#18121#17949
21M → 35K14111+130#17949#17819
35K → 23M23415+219#17819#17600
23M → 24M16914+155#17600#17445
24M → 40K16311+152#17445#17293
40K → 25.2M5913+46#17293#17247
25.2M → Finish10326+77#17247#17170
TOTALS3477550+2927
📊

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