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BOSTON MARATHON 2023

Megan Jefferson

Bib: 31051•F

KS

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
9:14/mi
28:42
↑ 97↓ 3451.5%
10K· 6.21 mi
8:37/mi
55:29
↑ 79↓ 1380.4%
15K· 9.32 mi
8:28/mi
1:21:48
↑ 67↓ 78
20K· 12.43 mi
8:32/mi
1:48:19
↑ 106↓ 860.1%
Half· 13.11 mi
8:24/mi
1:54:03
↑ 19↓ 370.5%
25K· 15.53 mi
8:29/mi
2:14:38
↑ 66↓ 880.2%
30K· 18.64 mi
8:42/mi
2:41:40
↑ 181↓ 1480.2%
20M
8:57/mi
2:53:50
↑ 64↓ 500.2%
21M
10:18/mi
3:04:08
↑ 106↓ 241.6%
35K· 21.75 mi
8:56/mi
3:10:49
↑ 17↓ 861.7%
23M
9:01/mi
3:22:06
↑ 23↓ 630.6%
24M
8:43/mi
3:30:49
↓ 821.3%
40K· 24.85 mi
8:50/mi
3:38:22
↓ 200.3%
25.2M
9:25/mi
3:41:37
↑ 13↓ 160.2%
Finish· 26.22 mi
8:11/mi
3:49:57
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:03
Pace8:42 /mi
2nd Half
Distance13.11 mi
Time1:55:54
Pace8:50 /mi
📊Positive Split: 1.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:50:5128:429:1428:42
9:14
-
10K
6.21 mi12:17:3855:298:5626:47
8:37
-0:37
15K
9.32 mi12:43:571:21:488:4726:19
8:28
-0:09
20K
12.43 mi13:10:281:48:198:4326:31
8:32
+0:04
Half
13.11 mi13:16:121:54:038:425:44
8:24
-0:08
25K
15.53 mi13:36:472:14:388:4020:35
8:29
+0:05
30K
18.64 mi14:03:492:41:408:4027:02
8:42
+0:13
20M
20.00 mi14:15:592:53:508:4112:10
8:57
+0:15
21M
21.00 mi14:26:173:04:088:4610:18
10:18
+1:21
35K
21.75 mi14:32:583:10:498:466:41
8:56
-1:22
23M
23.00 mi14:44:153:22:068:4711:17
9:01
+0:05
24M
24.00 mi14:52:583:30:498:478:43
8:43
-0:18
40K
24.85 mi15:00:313:38:228:477:33
8:50
+0:07
25.2M
25.20 mi15:03:463:41:378:483:15
9:25
+0:35
Finish
26.22 mi15:12:063:49:578:478:20
8:11
-1:14

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

8:47 /mi

Slowest Pace

10:18 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

40:23

18% of race

Time at Steady Pace

2:16:02

59% of race

Time at Slower Pace

53:32

23% of race

Average Pace: 8:46 /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 mi11:50:5128:429:1428:42
9:14
#21327
10K
6.21 mi12:17:3855:298:5626:47
8:37
#20343
15K
9.32 mi12:43:571:21:488:4726:19
8:28
#19479
20K
12.43 mi13:10:281:48:198:4326:31
8:32
#18878
Half
13.11 mi13:16:121:54:038:425:44
8:24
#18781
25K
15.53 mi13:36:472:14:388:4020:35
8:29
#18385
30K
18.64 mi14:03:492:41:408:4027:02
8:42
#17793
20M
20.00 mi14:15:592:53:508:4112:10
8:57
#17683
21M
21.00 mi14:26:173:04:088:4610:18
10:18
#17789
35K
21.75 mi14:32:583:10:498:466:41
8:56
#17776
23M
23.00 mi14:44:153:22:068:4711:17
9:01
#17684
24M
24.00 mi14:52:583:30:498:478:43
8:43
#17605
40K
24.85 mi15:00:313:38:228:477:33
8:50
#17531
25.2M
25.20 mi15:03:463:41:378:483:15
9:25
#17470
Finish
26.22 mi15:12:063:49:578:478:20
8:11
#17337
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi213278539853917615(Top 66%)6281(Top 55%)6281(Top 129%)
10K6.21 mi3.10 mi20343+9847944+5957944+59518951(Top 71%)7055(Top 62%)7055(Top 144%)
15K9.32 mi3.11 mi19479+8647435+5097435+50917615(Top 66%)6281(Top 55%)6281(Top 129%)
20K12.43 mi3.11 mi18878+6017047+3887047+38817095(Top 64%)5984(Top 52%)5984(Top 123%)
Half13.11 mi0.68 mi18781+976989+586989+5817202(Top 65%)6018(Top 53%)6018(Top 123%)
25K15.53 mi2.42 mi18385+3966757+2326757+23216146(Top 61%)5530(Top 48%)5530(Top 113%)
30K18.64 mi3.11 mi17793+5926432+3256432+32515529(Top 58%)5235(Top 46%)5235(Top 107%)
20M20.00 mi1.36 mi17683+1106383+496383+4916313(Top 61%)5762(Top 50%)5762(Top 118%)
21M21.00 mi1.00 mi17789-1066464-816464-8119030(Top 71%)7357(Top 64%)7357(Top 151%)
35K21.75 mi0.75 mi17776+136468-46468-417644(Top 66%)6630(Top 58%)6630(Top 136%)
23M23.00 mi1.25 mi17684+926432+366432+3616142(Top 61%)5822(Top 51%)5822(Top 119%)
24M24.00 mi1.00 mi17605+796400+326400+3215787(Top 59%)5700(Top 50%)5700(Top 117%)
40K24.85 mi0.85 mi17531+746360+406360+4015285(Top 57%)5467(Top 48%)5467(Top 112%)
25.2M25.20 mi0.35 mi17470+616334+266334+2614900(Top 56%)5258(Top 46%)5258(Top 108%)
Finish26.22 mi1.02 mi17337+1336266+686266+6813331(Top 50%)4390(Top 38%)4390(Top 90%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 66%
×21story building
+97ft-345ft

Overall

17615

Females

6281

F18-39

6281

5K→10K

3.1 - 6.2 mi

Top 71%
×5story building
+79ft-138ft

Overall

18951

Females

7055

F18-39

7055

10K→15K

6.2 - 9.3 mi

Top 66%
×3story building
+67ft-78ft

Overall

17615

Females

6281

F18-39

6281

15K→20K

9.3 - 12.4 mi

Top 64%
×5story building
+106ft-86ft

Overall

17095

Females

5984

F18-39

5984

20K→Half

12.4 - 13.1 mi

Top 65%
×2story building
+19ft-37ft

Overall

17202

Females

6018

F18-39

6018

Half→25K

13.1 - 15.5 mi

Top 61%
×4story building
+66ft-88ft

Overall

16146

Females

5530

F18-39

5530

25K→30K

15.5 - 18.6 mi

Top 58%
×9story building
+181ft-148ft

Overall

15529

Females

5235

F18-39

5235

30K→20M

18.6 - 20.0 mi

Top 61%
×5story building
+64ft-50ft

Overall

16313

Females

5762

F18-39

5762

20M→21M

20.0 - 21.0 mi

Top 71%
×8story building
+106ft-24ft

Overall

19030

Females

7357

F18-39

7357

21M→35K

21.0 - 21.8 mi

Top 66%
×7story building
+17ft-86ft

Overall

17644

Females

6630

F18-39

6630

35K→23M

21.8 - 23.0 mi

Top 61%
×5story building
+23ft-63ft

Overall

16142

Females

5822

F18-39

5822

23M→24M

23.0 - 24.0 mi

Top 59%
×6story building
+12ft-82ft

Overall

15787

Females

5700

F18-39

5700

24M→40K

24.0 - 24.9 mi

Top 57%
×1story
+6ft-20ft

Overall

15285

Females

5467

F18-39

5467

40K→25.2M

24.9 - 25.2 mi

Top 56%
×1story
+13ft-16ft

Overall

14900

Females

5258

F18-39

5258

25.2M→Finish

25.2 - 26.2 mi

Top 50%
×2story building
+22ft-21ft

Overall

13331

Females

4390

F18-39

4390

Passing Analysis

Category:
Athletes Passed
4419
Passed By
429
Net Change
+3990
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21327
5K → 10K102945+984#21327#20343
10K → 15K87511+864#20343#19479
15K → 20K6109+601#19479#18878
20K → Half981+97#18878#18781
Half → 25K4026+396#18781#18385
25K → 30K5997+592#18385#17793
30K → 20M14535+110#17793#17683
20M → 21M53159-106#17683#17789
21M → 35K5845+13#17789#17776
35K → 23M13038+92#17776#17684
23M → 24M10425+79#17684#17605
24M → 40K10329+74#17605#17531
40K → 25.2M698+61#17531#17470
25.2M → Finish14411+133#17470#17337
TOTALS4419429+3990
📊

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