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BOSTON MARATHON 2023

Erin Schaefer

Bib: 20922•F

OH

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Masters (Masters Women)
#0 / 6539
Division (F45-49)
#0 / 1817
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
26:38
Rank: #18062
Start → 5K
26:38 | 8:34/mi
10K· 6.21 mi
53:29
Rank: #18572 (-510)
5K → 10K
26:51 | 8:39/mi
15K· 9.32 mi
1:20:49
Rank: #18876 (-304)
10K → 15K
27:20 | 8:48/mi
20K· 12.43 mi
1:48:24
Rank: #18912 (-36)
15K → 20K
27:35 | 8:53/mi
Half· 13.11 mi
1:54:27
Rank: #18974 (-62)
20K → Half
6:03 | 8:52/mi
25K· 15.53 mi
2:16:19
Rank: #18972 (+2)
Half → 25K
21:52 | 9:01/mi
30K· 18.64 mi
2:45:22
Rank: #18955 (+17)
25K → 30K
29:03 | 9:21/mi
20M
2:58:01
Rank: #18874 (+81)
30K → 20M
12:39 | 9:19/mi
21M
3:07:43
Rank: #18739 (+135)
20M → 21M
9:42 | 9:42/mi
35K· 21.75 mi
3:14:33
Rank: #18727 (+12)
21M → 35K
6:50 | 9:08/mi
23M
3:26:13
Rank: #18648 (+79)
35K → 23M
11:40 | 9:19/mi
24M
3:35:18
Rank: #18601 (+47)
23M → 24M
9:05 | 9:05/mi
40K· 24.85 mi
3:42:50
Rank: #18478 (+123)
24M → 40K
7:32 | 8:49/mi
25.2M
3:46:05
Rank: #18417 (+61)
40K → 25.2M
3:15 | 9:25/mi
Finish· 26.22 mi
3:54:28
Rank: #18268 (+149)
25.2M → Finish
8:23 | 8:14/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:27
Pace8:44 /mi
2nd Half
Distance13.11 mi
Time2:00:01
Pace9:09 /mi
📊Positive Split: 4.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:1426:388:3426:38
8:34
-
10K
6.21 mi11:46:0553:298:3626:51
8:39
+0:05
15K
9.32 mi12:13:251:20:498:4027:20
8:48
+0:09
20K
12.43 mi12:41:001:48:248:4327:35
8:53
+0:05
Half
13.11 mi12:47:031:54:278:446:03
8:52
-0:01
25K
15.53 mi13:08:552:16:198:4721:52
9:01
+0:09
30K
18.64 mi13:37:582:45:228:5229:03
9:21
+0:20
20M
20.00 mi13:50:372:58:018:5412:39
9:19
-0:02
21M
21.00 mi14:00:193:07:438:569:42
9:42
+0:23
35K
21.75 mi14:07:093:14:338:576:50
9:08
-0:34
23M
23.00 mi14:18:493:26:138:5811:40
9:19
+0:11
24M
24.00 mi14:27:543:35:188:589:05
9:05
-0:14
40K
24.85 mi14:35:263:42:508:587:32
8:49
-0:16
25.2M
25.20 mi14:38:413:46:058:583:15
9:25
+0:36
Finish
26.22 mi14:47:043:54:288:578:23
8:14
-1:11

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

8:14 /mi

Average Pace

8:57 /mi

Slowest Pace

9:42 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:32:14

65% of race

Time at Steady Pace

1:22:14

35% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:57 /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 mi11:19:1426:388:3426:38
8:34
#18062
10K
6.21 mi11:46:0553:298:3626:51
8:39
#18572
15K
9.32 mi12:13:251:20:498:4027:20
8:48
#18876
20K
12.43 mi12:41:001:48:248:4327:35
8:53
#18912
Half
13.11 mi12:47:031:54:278:446:03
8:52
#18974
25K
15.53 mi13:08:552:16:198:4721:52
9:01
#18972
30K
18.64 mi13:37:582:45:228:5229:03
9:21
#18955
20M
20.00 mi13:50:372:58:018:5412:39
9:19
#18874
21M
21.00 mi14:00:193:07:438:569:42
9:42
#18739
35K
21.75 mi14:07:093:14:338:576:50
9:08
#18727
23M
23.00 mi14:18:493:26:138:5811:40
9:19
#18648
24M
24.00 mi14:27:543:35:188:589:05
9:05
#18601
40K
24.85 mi14:35:263:42:508:587:32
8:49
#18478
25.2M
25.20 mi14:38:413:46:058:583:15
9:25
#18417
Finish
26.22 mi14:47:043:54:288:578:23
8:14
#18268
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi180626597659719504(Top 73%)7392(Top 65%)7392(Top 407%)
10K6.21 mi3.10 mi18572-5106869-2726869-27219105(Top 72%)7144(Top 63%)7144(Top 393%)
15K9.32 mi3.11 mi18876-3047053-1847053-18419504(Top 73%)7392(Top 65%)7392(Top 407%)
20K12.43 mi3.11 mi18912-367071-187071-1819111(Top 72%)7156(Top 63%)7156(Top 394%)
Half13.11 mi0.68 mi18974-627107-367107-3619846(Top 75%)7571(Top 66%)7571(Top 417%)
25K15.53 mi2.42 mi18972+27105+27105+219058(Top 72%)7162(Top 63%)7162(Top 394%)
30K18.64 mi3.11 mi18955+177113-87113-818831(Top 71%)7096(Top 62%)7096(Top 391%)
20M20.00 mi1.36 mi18874+817086+277086+2718075(Top 68%)6781(Top 59%)6781(Top 373%)
21M21.00 mi1.00 mi18739+1357012+747012+7416874(Top 63%)6121(Top 54%)6121(Top 337%)
35K21.75 mi0.75 mi18727+127013-17013-118483(Top 69%)7091(Top 62%)7091(Top 390%)
23M23.00 mi1.25 mi18648+796982+316982+3117619(Top 66%)6643(Top 58%)6643(Top 366%)
24M24.00 mi1.00 mi18601+476964+186964+1817617(Top 66%)6701(Top 59%)6701(Top 369%)
40K24.85 mi0.85 mi18478+1236906+586906+5815177(Top 57%)5407(Top 47%)5407(Top 298%)
25.2M25.20 mi0.35 mi18417+616882+246882+2414915(Top 56%)5273(Top 46%)5273(Top 290%)
Finish26.22 mi1.02 mi18268+1496804+786804+7813669(Top 51%)4575(Top 40%)4575(Top 252%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 73%
×21stories
+97ft-345ft

Overall

19504

Females

7392

F45-49

7392

5K→10K

3.1 - 6.2 mi

Top 72%
×5stories
+79ft-138ft

Overall

19105

Females

7144

F45-49

7144

10K→15K

6.2 - 9.3 mi

Top 73%
×3stories
+67ft-78ft

Overall

19504

Females

7392

F45-49

7392

15K→20K

9.3 - 12.4 mi

Top 72%
×5stories
+106ft-86ft

Overall

19111

Females

7156

F45-49

7156

20K→Half

12.4 - 13.1 mi

Top 75%
×2stories
+19ft-37ft

Overall

19846

Females

7571

F45-49

7571

Half→25K

13.1 - 15.5 mi

Top 72%
×4stories
+66ft-88ft

Overall

19058

Females

7162

F45-49

7162

25K→30K

15.5 - 18.6 mi

Top 71%
×9stories
+181ft-148ft

Overall

18831

Females

7096

F45-49

7096

30K→20M

18.6 - 20.0 mi

Top 68%
×5stories
+64ft-50ft

Overall

18075

Females

6781

F45-49

6781

20M→21M

20.0 - 21.0 mi

Top 63%
×8stories
+106ft-24ft

Overall

16874

Females

6121

F45-49

6121

21M→35K

21.0 - 21.8 mi

Top 69%
×7stories
+17ft-86ft

Overall

18483

Females

7091

F45-49

7091

35K→23M

21.8 - 23.0 mi

Top 66%
×5stories
+23ft-63ft

Overall

17619

Females

6643

F45-49

6643

23M→24M

23.0 - 24.0 mi

Top 66%
×6stories
+12ft-82ft

Overall

17617

Females

6701

F45-49

6701

24M→40K

24.0 - 24.9 mi

Top 57%
×1story
+6ft-20ft

Overall

15177

Females

5407

F45-49

5407

40K→25.2M

24.9 - 25.2 mi

Top 56%
×1story
+13ft-16ft

Overall

14915

Females

5273

F45-49

5273

25.2M→Finish

25.2 - 26.2 mi

Top 51%
×2stories
+22ft-21ft

Overall

13669

Females

4575

F45-49

4575

Passing Analysis

Category:
Athletes Passed
1563
Passed By
1769
Net Change
-206
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18062
5K → 10K141651-510#18062#18572
10K → 15K84388-304#18572#18876
15K → 20K151187-36#18876#18912
20K → Half769-62#18912#18974
Half → 25K128126+2#18974#18972
25K → 30K176159+17#18972#18955
30K → 20M12645+81#18955#18874
20M → 21M15520+135#18874#18739
21M → 35K5139+12#18739#18727
35K → 23M11839+79#18727#18648
23M → 24M7831+47#18648#18601
24M → 40K1274+123#18601#18478
40K → 25.2M643+61#18478#18417
25.2M → Finish1578+149#18417#18268
TOTALS15631769-206
📊

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