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BOSTON MARATHON 2023

Stephanie Seiffert

Bib: 15382•F

TX

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Masters (Masters Women)
#0 / 6539
Top 46%
Division (F40-44)
#0 / 1878
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
8:03/mi
25:01
↑ 97↓ 3451.5%
10K· 6.21 mi
8:05/mi
50:08
↑ 79↓ 1380.4%
15K· 9.32 mi
8:10/mi
1:15:30
↑ 67↓ 78
20K· 12.43 mi
8:11/mi
1:40:54
↑ 106↓ 860.1%
Half· 13.11 mi
8:04/mi
1:46:24
↑ 19↓ 370.5%
25K· 15.53 mi
8:15/mi
2:06:23
↑ 66↓ 880.2%
30K· 18.64 mi
8:29/mi
2:32:44
↑ 181↓ 1480.2%
20M
8:57/mi
2:44:54
↑ 64↓ 500.2%
21M
10:16/mi
2:55:10
↑ 106↓ 241.6%
35K· 21.75 mi
9:41/mi
3:02:25
↑ 17↓ 861.7%
23M
9:45/mi
3:14:38
↑ 23↓ 630.6%
24M
10:12/mi
3:24:50
↓ 821.3%
40K· 24.85 mi
11:39/mi
3:34:48
↓ 200.3%
25.2M
12:28/mi
3:39:06
↑ 13↓ 160.2%
Finish· 26.22 mi
10:19/mi
3:49:37
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:46:24
Pace8:07 /mi
2nd Half
Distance13.11 mi
Time2:03:13
Pace9:24 /mi
📊Positive Split: 15.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:55:3025:018:0325:01
8:03
-
10K
6.21 mi11:20:3750:088:0425:07
8:05
+0:02
15K
9.32 mi11:45:591:15:308:0625:22
8:10
+0:05
20K
12.43 mi12:11:231:40:548:0725:24
8:11
+0:01
Half
13.11 mi12:16:531:46:248:075:30
8:04
-0:07
25K
15.53 mi12:36:522:06:238:0819:59
8:15
+0:11
30K
18.64 mi13:03:132:32:448:1226:21
8:29
+0:14
20M
20.00 mi13:15:232:44:548:1512:10
8:57
+0:28
21M
21.00 mi13:25:392:55:108:2010:16
10:16
+1:19
35K
21.75 mi13:32:543:02:258:237:15
9:41
-0:35
23M
23.00 mi13:45:073:14:388:2812:13
9:45
+0:04
24M
24.00 mi13:55:193:24:508:3210:12
10:12
+0:27
40K
24.85 mi14:05:173:34:488:399:58
11:39
+1:27
25.2M
25.20 mi14:09:353:39:068:424:18
12:28
+0:49
Finish
26.22 mi14:20:063:49:378:4610:31
10:19
-2:09

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

8:03 /mi

Average Pace

8:46 /mi

Slowest Pace

12:28 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:06:23

55% of race

Time at Steady Pace

38:31

17% of race

Time at Slower Pace

1:04:43

28% of race

Average Pace: 8:45 /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 mi10:55:3025:018:0325:01
8:03
#14390
10K
6.21 mi11:20:3750:088:0425:07
8:05
#14900
15K
9.32 mi11:45:591:15:308:0625:22
8:10
#15123
20K
12.43 mi12:11:231:40:548:0725:24
8:11
#15021
Half
13.11 mi12:16:531:46:248:075:30
8:04
#14998
25K
15.53 mi12:36:522:06:238:0819:59
8:15
#14892
30K
18.64 mi13:03:132:32:448:1226:21
8:29
#14762
20M
20.00 mi13:15:232:44:548:1512:10
8:57
#14877
21M
21.00 mi13:25:392:55:108:2010:16
10:16
#15155
35K
21.75 mi13:32:543:02:258:237:15
9:41
#15412
23M
23.00 mi13:45:073:14:388:2812:13
9:45
#15695
24M
24.00 mi13:55:193:24:508:3210:12
10:12
#16089
40K
24.85 mi14:05:173:34:488:399:58
11:39
#16666
25.2M
25.20 mi14:09:353:39:068:424:18
12:28
#16878
Finish
26.22 mi14:20:063:49:378:4610:31
10:19
#17262
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi143904263426315632(Top 59%)5074(Top 44%)5074(Top 270%)
10K6.21 mi3.10 mi14900-5104595-3324595-33215421(Top 58%)4922(Top 43%)4922(Top 262%)
15K9.32 mi3.11 mi15123-2234740-1454740-14515632(Top 59%)5074(Top 44%)5074(Top 270%)
20K12.43 mi3.11 mi15021+1024696+444696+4414813(Top 56%)4600(Top 40%)4600(Top 245%)
Half13.11 mi0.68 mi14998+234681+154681+1514954(Top 56%)4674(Top 41%)4674(Top 249%)
25K15.53 mi2.42 mi14892+1064644+374644+3714561(Top 55%)4563(Top 40%)4563(Top 243%)
30K18.64 mi3.11 mi14762+1304592+524592+5214214(Top 53%)4466(Top 39%)4466(Top 238%)
20M20.00 mi1.36 mi14877-1154692-1004692-10016312(Top 61%)5761(Top 50%)5761(Top 307%)
21M21.00 mi1.00 mi15155-2784898-2064898-20618932(Top 71%)7296(Top 64%)7296(Top 388%)
35K21.75 mi0.75 mi15412-2575080-1825080-18220450(Top 77%)8192(Top 72%)8192(Top 436%)
23M23.00 mi1.25 mi15695-2835280-2005280-20019289(Top 72%)7572(Top 66%)7572(Top 403%)
24M24.00 mi1.00 mi16089-3945517-2375517-23721332(Top 80%)8740(Top 77%)8740(Top 465%)
40K24.85 mi0.85 mi16666-5775863-3465863-34623452(Top 88%)9908(Top 87%)9908(Top 528%)
25.2M25.20 mi0.35 mi16878-2125999-1365999-13623233(Top 87%)9779(Top 86%)9779(Top 521%)
Finish26.22 mi1.02 mi17262-3846222-2236222-22322604(Top 85%)9441(Top 83%)9441(Top 503%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 59%
×21story building
+97ft-345ft

Overall

15632

Females

5074

F40-44

5074

5K→10K

3.1 - 6.2 mi

Top 58%
×5story building
+79ft-138ft

Overall

15421

Females

4922

F40-44

4922

10K→15K

6.2 - 9.3 mi

Top 59%
×3story building
+67ft-78ft

Overall

15632

Females

5074

F40-44

5074

15K→20K

9.3 - 12.4 mi

Top 56%
×5story building
+106ft-86ft

Overall

14813

Females

4600

F40-44

4600

20K→Half

12.4 - 13.1 mi

Top 56%
×2story building
+19ft-37ft

Overall

14954

Females

4674

F40-44

4674

Half→25K

13.1 - 15.5 mi

Top 55%
×4story building
+66ft-88ft

Overall

14561

Females

4563

F40-44

4563

25K→30K

15.5 - 18.6 mi

Top 53%
×9story building
+181ft-148ft

Overall

14214

Females

4466

F40-44

4466

30K→20M

18.6 - 20.0 mi

Top 61%
×5story building
+64ft-50ft

Overall

16312

Females

5761

F40-44

5761

20M→21M

20.0 - 21.0 mi

Top 71%
×8story building
+106ft-24ft

Overall

18932

Females

7296

F40-44

7296

21M→35K

21.0 - 21.8 mi

Top 77%
×7story building
+17ft-86ft

Overall

20450

Females

8192

F40-44

8192

35K→23M

21.8 - 23.0 mi

Top 72%
×5story building
+23ft-63ft

Overall

19289

Females

7572

F40-44

7572

23M→24M

23.0 - 24.0 mi

Top 80%
×6story building
+12ft-82ft

Overall

21332

Females

8740

F40-44

8740

24M→40K

24.0 - 24.9 mi

Top 88%
×1story
+6ft-20ft

Overall

23452

Females

9908

F40-44

9908

40K→25.2M

24.9 - 25.2 mi

Top 87%
×1story
+13ft-16ft

Overall

23233

Females

9779

F40-44

9779

25.2M→Finish

25.2 - 26.2 mi

Top 85%
×2story building
+22ft-21ft

Overall

22604

Females

9441

F40-44

9441

Passing Analysis

Category:
Athletes Passed
1077
Passed By
3949
Net Change
-2872
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#14390
5K → 10K120630-510#14390#14900
10K → 15K110333-223#14900#15123
15K → 20K236134+102#15123#15021
20K → Half4623+23#15021#14998
Half → 25K18175+106#14998#14892
25K → 30K22999+130#14892#14762
30K → 20M50165-115#14762#14877
20M → 21M30308-278#14877#15155
21M → 35K6263-257#15155#15412
35K → 23M34317-283#15412#15695
23M → 24M16410-394#15695#16089
24M → 40K6583-577#16089#16666
40K → 25.2M4216-212#16666#16878
25.2M → Finish9393-384#16878#17262
TOTALS10773949-2872
📊

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