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BOSTON MARATHON 2023

Cassie Chin

Bib: 27839•F

MA

0:00
0:00
/ mi
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Division (F18-39)
#0 / 4884
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ 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
10:06/mi
31:24
↑ 97↓ 3451.5%
10K· 6.21 mi
10:02/mi
1:02:33
↑ 79↓ 1380.4%
15K· 9.32 mi
9:48/mi
1:33:00
↑ 67↓ 78
20K· 12.43 mi
10:09/mi
2:04:33
↑ 106↓ 860.1%
Half· 13.11 mi
10:02/mi
2:11:24
↑ 19↓ 370.5%
25K· 15.53 mi
10:28/mi
2:36:46
↑ 66↓ 880.2%
30K· 18.64 mi
10:27/mi
3:09:14
↑ 181↓ 1480.2%
20M
11:48/mi
3:25:16
↑ 64↓ 500.2%
21M
11:49/mi
3:37:05
↑ 106↓ 241.6%
35K· 21.75 mi
10:08/mi
3:44:40
↑ 17↓ 861.7%
23M
11:28/mi
3:59:01
↑ 23↓ 630.6%
24M
10:17/mi
4:09:18
↓ 821.3%
40K· 24.85 mi
10:54/mi
4:18:37
↓ 200.3%
25.2M
11:48/mi
4:22:41
↑ 13↓ 160.2%
Finish· 26.22 mi
10:15/mi
4:33:08
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:11:24
Pace10:01 /mi
2nd Half
Distance13.11 mi
Time2:21:44
Pace10:49 /mi
📊Positive Split: 7.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:52:3331:2410:0631:24
10:06
-
10K
6.21 mi12:23:421:02:3310:0431:09
10:02
-0:04
15K
9.32 mi12:54:091:33:009:5930:27
9:48
-0:14
20K
12.43 mi13:25:422:04:3310:0131:33
10:09
+0:21
Half
13.11 mi13:32:332:11:2410:016:51
10:02
-0:07
25K
15.53 mi13:57:552:36:4610:0525:22
10:28
+0:26
30K
18.64 mi14:30:233:09:1410:0932:28
10:27
-0:01
20M
20.00 mi14:46:253:25:1610:1616:02
11:48
+1:21
21M
21.00 mi14:58:143:37:0510:2011:49
11:49
+0:01
35K
21.75 mi15:05:493:44:4010:207:35
10:08
-1:41
23M
23.00 mi15:20:103:59:0110:2414:21
11:28
+1:20
24M
24.00 mi15:30:274:09:1810:2310:17
10:17
-1:11
40K
24.85 mi15:39:464:18:3710:249:19
10:54
+0:37
25.2M
25.20 mi15:43:504:22:4110:254:04
11:48
+0:54
Finish
26.22 mi15:54:174:33:0810:2510:27
10:15
-1:33

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

9:48 /mi

Average Pace

10:25 /mi

Slowest Pace

11:49 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

30:27

11% of race

Time at Steady Pace

3:07:06

69% of race

Time at Slower Pace

55:35

20% of race

Average Pace: 10:25 /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 mi11:52:3331:2410:0631:24
10:06
#23701
10K
6.21 mi12:23:421:02:3310:0431:09
10:02
#23774
15K
9.32 mi12:54:091:33:009:5930:27
9:48
#23556
20K
12.43 mi13:25:422:04:3310:0131:33
10:09
#23463
Half
13.11 mi13:32:332:11:2410:016:51
10:02
#23466
25K
15.53 mi13:57:552:36:4610:0525:22
10:28
#23405
30K
18.64 mi14:30:233:09:1410:0932:28
10:27
#23151
20M
20.00 mi14:46:253:25:1610:1616:02
11:48
#23205
21M
21.00 mi14:58:143:37:0510:2011:49
11:49
#23179
35K
21.75 mi15:05:493:44:4010:207:35
10:08
#23119
23M
23.00 mi15:20:103:59:0110:2414:21
11:28
#23121
24M
24.00 mi15:30:274:09:1810:2310:17
10:17
#23045
40K
24.85 mi15:39:464:18:3710:249:19
10:54
#22991
25.2M
25.20 mi15:43:504:22:4110:254:04
11:48
#22977
Finish
26.22 mi15:54:174:33:0810:2510:27
10:15
#22970
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi237019748974823053(Top 87%)9375(Top 82%)9375(Top 192%)
10K6.21 mi3.10 mi23774-739772-249772-2423746(Top 89%)9758(Top 85%)9758(Top 200%)
15K9.32 mi3.11 mi23556+2189644+1289644+12823053(Top 87%)9375(Top 82%)9375(Top 192%)
20K12.43 mi3.11 mi23463+939581+639581+6323221(Top 87%)9465(Top 83%)9465(Top 194%)
Half13.11 mi0.68 mi23466-39587-69587-623373(Top 88%)9556(Top 84%)9556(Top 196%)
25K15.53 mi2.42 mi23405+619570+179570+1723132(Top 87%)9458(Top 83%)9458(Top 194%)
30K18.64 mi3.11 mi23151+2549464+1069464+10622111(Top 83%)8962(Top 78%)8962(Top 183%)
20M20.00 mi1.36 mi23205-549502-389502-3823946(Top 90%)10052(Top 88%)10052(Top 206%)
21M21.00 mi1.00 mi23179+269499+39499+322456(Top 84%)9254(Top 81%)9254(Top 189%)
35K21.75 mi0.75 mi23119+609481+189481+1821652(Top 81%)8858(Top 78%)8858(Top 181%)
23M23.00 mi1.25 mi23121-29485-49485-423191(Top 87%)9689(Top 85%)9689(Top 198%)
24M24.00 mi1.00 mi23045+769461+249461+2421539(Top 81%)8871(Top 78%)8871(Top 182%)
40K24.85 mi0.85 mi22991+549440+219440+2122150(Top 83%)9219(Top 81%)9219(Top 189%)
25.2M25.20 mi0.35 mi22977+149429+119429+1122161(Top 83%)9220(Top 81%)9220(Top 189%)
Finish26.22 mi1.02 mi22970+79432-39432-322438(Top 84%)9352(Top 82%)9352(Top 191%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 87%
×21story building
+97ft-345ft

Overall

23053

Females

9375

F18-39

9375

5K→10K

3.1 - 6.2 mi

Top 89%
×5story building
+79ft-138ft

Overall

23746

Females

9758

F18-39

9758

10K→15K

6.2 - 9.3 mi

Top 87%
×3story building
+67ft-78ft

Overall

23053

Females

9375

F18-39

9375

15K→20K

9.3 - 12.4 mi

Top 87%
×5story building
+106ft-86ft

Overall

23221

Females

9465

F18-39

9465

20K→Half

12.4 - 13.1 mi

Top 88%
×2story building
+19ft-37ft

Overall

23373

Females

9556

F18-39

9556

Half→25K

13.1 - 15.5 mi

Top 87%
×4story building
+66ft-88ft

Overall

23132

Females

9458

F18-39

9458

25K→30K

15.5 - 18.6 mi

Top 83%
×9story building
+181ft-148ft

Overall

22111

Females

8962

F18-39

8962

30K→20M

18.6 - 20.0 mi

Top 90%
×5story building
+64ft-50ft

Overall

23946

Females

10052

F18-39

10052

20M→21M

20.0 - 21.0 mi

Top 84%
×8story building
+106ft-24ft

Overall

22456

Females

9254

F18-39

9254

21M→35K

21.0 - 21.8 mi

Top 81%
×7story building
+17ft-86ft

Overall

21652

Females

8858

F18-39

8858

35K→23M

21.8 - 23.0 mi

Top 87%
×5story building
+23ft-63ft

Overall

23191

Females

9689

F18-39

9689

23M→24M

23.0 - 24.0 mi

Top 81%
×6story building
+12ft-82ft

Overall

21539

Females

8871

F18-39

8871

24M→40K

24.0 - 24.9 mi

Top 83%
×1story
+6ft-20ft

Overall

22150

Females

9219

F18-39

9219

40K→25.2M

24.9 - 25.2 mi

Top 83%
×1story
+13ft-16ft

Overall

22161

Females

9220

F18-39

9220

25.2M→Finish

25.2 - 26.2 mi

Top 84%
×2story building
+22ft-21ft

Overall

22438

Females

9352

F18-39

9352

Passing Analysis

Category:
Athletes Passed
1432
Passed By
701
Net Change
+731
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23701
5K → 10K166239-73#23701#23774
10K → 15K24931+218#23774#23556
15K → 20K17178+93#23556#23463
20K → Half2831-3#23463#23466
Half → 25K11857+61#23466#23405
25K → 30K27723+254#23405#23151
30K → 20M3892-54#23151#23205
20M → 21M6034+26#23205#23179
21M → 35K633+60#23179#23119
35K → 23M4951-2#23119#23121
23M → 24M8610+76#23121#23045
24M → 40K6511+54#23045#22991
40K → 25.2M217+14#22991#22977
25.2M → Finish4134+7#22977#22970
TOTALS1432701+731
📊

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