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BOSTON MARATHON 2025

Yatzu Chang

Bib: 21450•F

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

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
8:27/mi
26:15
↑ 97↓ 3451.5%
10K· 6.21 mi
8:34/mi
52:51
↑ 79↓ 1380.4%
15K· 9.32 mi
8:42/mi
1:19:54
↑ 67↓ 78
20K· 12.43 mi
9:32/mi
1:49:30
↑ 106↓ 860.1%
Half· 13.11 mi
9:02/mi
1:55:40
↑ 19↓ 370.5%
25K· 15.53 mi
9:18/mi
2:18:13
↑ 66↓ 880.2%
30K· 18.64 mi
10:32/mi
2:50:55
↑ 181↓ 1480.2%
20M
10:47/mi
3:05:34
↑ 64↓ 500.2%
21M
12:15/mi
3:17:49
↑ 106↓ 241.6%
35K· 21.75 mi
11:04/mi
3:26:06
↑ 17↓ 861.7%
23M
12:04/mi
3:41:12
↑ 23↓ 630.6%
24M
10:46/mi
3:51:58
↓ 821.3%
40K· 24.85 mi
9:56/mi
4:00:28
↓ 200.3%
25.2M
10:38/mi
4:04:08
↑ 13↓ 160.2%
Finish· 26.22 mi
8:43/mi
4:13:01
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:55:40
Pace8:49 /mi
2nd Half
Distance13.11 mi
Time2:17:21
Pace10:29 /mi
📊Positive Split: 18.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:22:2526:158:2726:15
8:27
-
10K
6.21 mi11:49:0152:518:3026:36
8:34
+0:07
15K
9.32 mi12:16:041:19:548:3427:03
8:42
+0:08
20K
12.43 mi12:45:401:49:308:4929:36
9:32
+0:50
Half
13.11 mi12:51:501:55:408:496:10
9:02
-0:30
25K
15.53 mi13:14:232:18:138:5422:33
9:18
+0:16
30K
18.64 mi13:47:052:50:559:1032:42
10:32
+1:14
20M
20.00 mi14:01:443:05:349:1714:39
10:47
+0:15
21M
21.00 mi14:13:593:17:499:2512:15
12:15
+1:28
35K
21.75 mi14:22:163:26:069:298:17
11:04
-1:11
23M
23.00 mi14:37:223:41:129:3715:06
12:04
+1:00
24M
24.00 mi14:48:083:51:589:4010:46
10:46
-1:18
40K
24.85 mi14:56:384:00:289:408:30
9:56
-0:50
25.2M
25.20 mi15:00:184:04:089:413:40
10:38
+0:42
Finish
26.22 mi15:09:114:13:019:398:53
8:43
-1:55

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

9:39 /mi

Slowest Pace

12:15 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:57:30

46% of race

Time at Steady Pace

1:10:48

28% of race

Time at Slower Pace

1:04:43

26% of race

Average Pace: 9:39 /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 mi11:22:2526:158:2726:15
8:27
#19608
10K
6.21 mi11:49:0152:518:3026:36
8:34
#19874
15K
9.32 mi12:16:041:19:548:3427:03
8:42
#20096
20K
12.43 mi12:45:401:49:308:4929:36
9:32
#20987
Half
13.11 mi12:51:501:55:408:496:10
9:02
#21054
25K
15.53 mi13:14:232:18:138:5422:33
9:18
#21090
30K
18.64 mi13:47:052:50:559:1032:42
10:32
#21618
20M
20.00 mi14:01:443:05:349:1714:39
10:47
#21790
21M
21.00 mi14:13:593:17:499:2512:15
12:15
#21984
35K
21.75 mi14:22:163:26:069:298:17
11:04
#22096
23M
23.00 mi14:37:223:41:129:3715:06
12:04
#22344
24M
24.00 mi14:48:083:51:589:4010:46
10:46
#22391
40K
24.85 mi14:56:384:00:289:408:30
9:56
#22309
25.2M
25.20 mi15:00:184:04:089:413:40
10:38
#22268
Finish
26.22 mi15:09:114:13:019:398:53
8:43
#22121
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi196087266726620542(Top 72%)7741(Top 63%)7741(Top 427%)
10K6.21 mi3.10 mi19874-2667399-1337399-13320167(Top 71%)7559(Top 62%)7559(Top 417%)
15K9.32 mi3.11 mi20096-2227525-1267525-12620542(Top 72%)7741(Top 63%)7741(Top 427%)
20K12.43 mi3.11 mi20987-8918023-4988023-49822992(Top 81%)9142(Top 75%)9142(Top 504%)
Half13.11 mi0.68 mi21054-678061-388061-3822019(Top 78%)8624(Top 71%)8624(Top 476%)
25K15.53 mi2.42 mi21090-368094-338094-3321193(Top 75%)8208(Top 67%)8208(Top 453%)
30K18.64 mi3.11 mi21618-5288413-3198413-31922992(Top 81%)9317(Top 76%)9317(Top 514%)
20M20.00 mi1.36 mi21790-1728523-1108523-11023141(Top 81%)9488(Top 78%)9488(Top 523%)
21M21.00 mi1.00 mi21984-1948653-1308653-13024024(Top 85%)10043(Top 82%)10043(Top 554%)
35K21.75 mi0.75 mi22096-1128729-768729-7624372(Top 86%)10256(Top 84%)10256(Top 566%)
23M23.00 mi1.25 mi22344-2488910-1818910-18125210(Top 89%)10710(Top 88%)10710(Top 591%)
24M24.00 mi1.00 mi22391-478954-448954-4423504(Top 83%)9878(Top 81%)9878(Top 545%)
40K24.85 mi0.85 mi22309+828927+278927+2720294(Top 71%)8314(Top 68%)8314(Top 459%)
25.2M25.20 mi0.35 mi22268+418905+228905+2219556(Top 69%)7943(Top 65%)7943(Top 438%)
Finish26.22 mi1.02 mi22121+1478849+568849+5617630(Top 62%)6898(Top 56%)6898(Top 380%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 72%
×21story building
+97ft-345ft

Overall

20542

Females

7741

F45-49

7741

5K→10K

3.1 - 6.2 mi

Top 71%
×5story building
+79ft-138ft

Overall

20167

Females

7559

F45-49

7559

10K→15K

6.2 - 9.3 mi

Top 72%
×3story building
+67ft-78ft

Overall

20542

Females

7741

F45-49

7741

15K→20K

9.3 - 12.4 mi

Top 81%
×5story building
+106ft-86ft

Overall

22992

Females

9142

F45-49

9142

20K→Half

12.4 - 13.1 mi

Top 78%
×2story building
+19ft-37ft

Overall

22019

Females

8624

F45-49

8624

Half→25K

13.1 - 15.5 mi

Top 75%
×4story building
+66ft-88ft

Overall

21193

Females

8208

F45-49

8208

25K→30K

15.5 - 18.6 mi

Top 81%
×9story building
+181ft-148ft

Overall

22992

Females

9317

F45-49

9317

30K→20M

18.6 - 20.0 mi

Top 81%
×5story building
+64ft-50ft

Overall

23141

Females

9488

F45-49

9488

20M→21M

20.0 - 21.0 mi

Top 85%
×8story building
+106ft-24ft

Overall

24024

Females

10043

F45-49

10043

21M→35K

21.0 - 21.8 mi

Top 86%
×7story building
+17ft-86ft

Overall

24372

Females

10256

F45-49

10256

35K→23M

21.8 - 23.0 mi

Top 89%
×5story building
+23ft-63ft

Overall

25210

Females

10710

F45-49

10710

23M→24M

23.0 - 24.0 mi

Top 83%
×6story building
+12ft-82ft

Overall

23504

Females

9878

F45-49

9878

24M→40K

24.0 - 24.9 mi

Top 71%
×1story
+6ft-20ft

Overall

20294

Females

8314

F45-49

8314

40K→25.2M

24.9 - 25.2 mi

Top 69%
×1story
+13ft-16ft

Overall

19556

Females

7943

F45-49

7943

25.2M→Finish

25.2 - 26.2 mi

Top 62%
×2story building
+22ft-21ft

Overall

17630

Females

6898

F45-49

6898

Passing Analysis

Category:
Athletes Passed
998
Passed By
3511
Net Change
-2513
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19608
5K → 10K158424-266#19608#19874
10K → 15K122344-222#19874#20096
15K → 20K40931-891#20096#20987
20K → Half1683-67#20987#21054
Half → 25K135171-36#21054#21090
25K → 30K82610-528#21090#21618
30K → 20M45217-172#21618#21790
20M → 21M29223-194#21790#21984
21M → 35K16128-112#21984#22096
35K → 23M34282-248#22096#22344
23M → 24M3986-47#22344#22391
24M → 40K919+82#22391#22309
40K → 25.2M432+41#22309#22268
25.2M → Finish1481+147#22268#22121
TOTALS9983511-2513
📊

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