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BOSTON MARATHON 2023

Cher Duffield

Bib: 20761•F

MA

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Top 43%
Masters (Masters Women)
#0 / 6539
Top 31%
Division (F45-49)
#0 / 1817
Top 35%
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
8:26/mi
26:13
↑ 97↓ 3451.5%
10K· 6.21 mi
8:16/mi
51:53
↑ 79↓ 1380.4%
15K· 9.32 mi
8:32/mi
1:18:23
↑ 67↓ 78
20K· 12.43 mi
8:20/mi
1:44:16
↑ 106↓ 860.1%
Half· 13.11 mi
8:04/mi
1:49:46
↑ 19↓ 370.5%
25K· 15.53 mi
8:22/mi
2:10:03
↑ 66↓ 880.2%
30K· 18.64 mi
8:31/mi
2:36:32
↑ 181↓ 1480.2%
20M
8:38/mi
2:48:16
↑ 64↓ 500.2%
21M
9:04/mi
2:57:20
↑ 106↓ 241.6%
35K· 21.75 mi
8:23/mi
3:03:36
↑ 17↓ 861.7%
23M
8:37/mi
3:14:23
↑ 23↓ 630.6%
24M
7:58/mi
3:22:21
↓ 821.3%
40K· 24.85 mi
8:08/mi
3:29:18
↓ 200.3%
25.2M
8:33/mi
3:32:15
↑ 13↓ 160.2%
Finish· 26.22 mi
7:38/mi
3:40:02
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:49:46
Pace8:22 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:50:16
Pace8:25 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:18:5726:138:2626:13
8:26
-
10K
6.21 mi11:44:3751:538:2125:40
8:16
-0:10
15K
9.32 mi12:11:071:18:238:2526:30
8:32
+0:16
20K
12.43 mi12:37:001:44:168:2325:53
8:20
-0:12
Half
13.11 mi12:42:301:49:468:225:30
8:04
-0:16
25K
15.53 mi13:02:472:10:038:2220:17
8:22
+0:18
30K
18.64 mi13:29:162:36:328:2426:29
8:31
+0:09
20M
20.00 mi13:41:002:48:168:2511:44
8:38
+0:07
21M
21.00 mi13:50:042:57:208:279:04
9:04
+0:26
35K
21.75 mi13:56:203:03:368:276:16
8:23
-0:41
23M
23.00 mi14:07:073:14:238:2710:47
8:37
+0:14
24M
24.00 mi14:15:053:22:218:267:58
7:58
-0:39
40K
24.85 mi14:22:023:29:188:256:57
8:08
+0:10
25.2M
25.20 mi14:24:593:32:158:252:57
8:33
+0:25
Finish
26.22 mi14:32:463:40:028:247:47
7:38
-0:55

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

7:38 /mi

Average Pace

8:24 /mi

Slowest Pace

9:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:46:18

48% of race

Time at Steady Pace

1:44:40

48% of race

Time at Slower Pace

9:04

4% of race

Average Pace: 8:24 /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 mi11:18:5726:138:2626:13
8:26
#17141
10K
6.21 mi11:44:3751:538:2125:40
8:16
#16853
15K
9.32 mi12:11:071:18:238:2526:30
8:32
#17261
20K
12.43 mi12:37:001:44:168:2325:53
8:20
#16860
Half
13.11 mi12:42:301:49:468:225:30
8:04
#16785
25K
15.53 mi13:02:472:10:038:2220:17
8:22
#16551
30K
18.64 mi13:29:162:36:328:2426:29
8:31
#16141
20M
20.00 mi13:41:002:48:168:2511:44
8:38
#15990
21M
21.00 mi13:50:042:57:208:279:04
9:04
#15824
35K
21.75 mi13:56:203:03:368:276:16
8:23
#15760
23M
23.00 mi14:07:073:14:238:2710:47
8:37
#15630
24M
24.00 mi14:15:053:22:218:267:58
7:58
#15433
40K
24.85 mi14:22:023:29:188:256:57
8:08
#15257
25.2M
25.20 mi14:24:593:32:158:252:57
8:33
#15145
Finish
26.22 mi14:32:463:40:028:247:47
7:38
#14960
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi171416023602318009(Top 68%)6497(Top 57%)6497(Top 358%)
10K6.21 mi3.10 mi16853+2885810+2135810+21316665(Top 63%)5672(Top 50%)5672(Top 312%)
15K9.32 mi3.11 mi17261-4086070-2606070-26018009(Top 68%)6497(Top 57%)6497(Top 358%)
20K12.43 mi3.11 mi16860+4015842+2285842+22815805(Top 59%)5227(Top 46%)5227(Top 288%)
Half13.11 mi0.68 mi16785+755791+515791+5114932(Top 56%)4652(Top 41%)4652(Top 256%)
25K15.53 mi2.42 mi16551+2345666+1255666+12515369(Top 58%)5058(Top 44%)5058(Top 278%)
30K18.64 mi3.11 mi16141+4105464+2025464+20214485(Top 54%)4618(Top 40%)4618(Top 254%)
20M20.00 mi1.36 mi15990+1515385+795385+7914505(Top 54%)4707(Top 41%)4707(Top 259%)
21M21.00 mi1.00 mi15824+1665315+705315+7013819(Top 52%)4397(Top 38%)4397(Top 242%)
35K21.75 mi0.75 mi15760+645289+265289+2614608(Top 55%)4890(Top 43%)4890(Top 269%)
23M23.00 mi1.25 mi15630+1305243+465243+4613896(Top 52%)4559(Top 40%)4559(Top 251%)
24M24.00 mi1.00 mi15433+1975129+1145129+11411064(Top 42%)3137(Top 27%)3137(Top 173%)
40K24.85 mi0.85 mi15257+1765026+1035026+10310953(Top 41%)3139(Top 27%)3139(Top 173%)
25.2M25.20 mi0.35 mi15145+1124975+514975+5110014(Top 38%)2730(Top 24%)2730(Top 150%)
Finish26.22 mi1.02 mi14960+1854887+884887+889599(Top 36%)2529(Top 22%)2529(Top 139%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 68%
×21story building
+97ft-345ft

Overall

18009

Females

6497

F45-49

6497

5K→10K

3.1 - 6.2 mi

Top 63%
×5story building
+79ft-138ft

Overall

16665

Females

5672

F45-49

5672

10K→15K

6.2 - 9.3 mi

Top 68%
×3story building
+67ft-78ft

Overall

18009

Females

6497

F45-49

6497

15K→20K

9.3 - 12.4 mi

Top 59%
×5story building
+106ft-86ft

Overall

15805

Females

5227

F45-49

5227

20K→Half

12.4 - 13.1 mi

Top 56%
×2story building
+19ft-37ft

Overall

14932

Females

4652

F45-49

4652

Half→25K

13.1 - 15.5 mi

Top 58%
×4story building
+66ft-88ft

Overall

15369

Females

5058

F45-49

5058

25K→30K

15.5 - 18.6 mi

Top 54%
×9story building
+181ft-148ft

Overall

14485

Females

4618

F45-49

4618

30K→20M

18.6 - 20.0 mi

Top 54%
×5story building
+64ft-50ft

Overall

14505

Females

4707

F45-49

4707

20M→21M

20.0 - 21.0 mi

Top 52%
×8story building
+106ft-24ft

Overall

13819

Females

4397

F45-49

4397

21M→35K

21.0 - 21.8 mi

Top 55%
×7story building
+17ft-86ft

Overall

14608

Females

4890

F45-49

4890

35K→23M

21.8 - 23.0 mi

Top 52%
×5story building
+23ft-63ft

Overall

13896

Females

4559

F45-49

4559

23M→24M

23.0 - 24.0 mi

Top 42%
×6story building
+12ft-82ft

Overall

11064

Females

3137

F45-49

3137

24M→40K

24.0 - 24.9 mi

Top 41%
×1story
+6ft-20ft

Overall

10953

Females

3139

F45-49

3139

40K→25.2M

24.9 - 25.2 mi

Top 38%
×1story
+13ft-16ft

Overall

10014

Females

2730

F45-49

2730

25.2M→Finish

25.2 - 26.2 mi

Top 36%
×2story building
+22ft-21ft

Overall

9599

Females

2529

F45-49

2529

Passing Analysis

Category:
Athletes Passed
3026
Passed By
845
Net Change
+2181
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17141
5K → 10K479191+288#17141#16853
10K → 15K74482-408#16853#17261
15K → 20K43433+401#17261#16860
20K → Half805+75#16860#16785
Half → 25K26026+234#16785#16551
25K → 30K43929+410#16551#16141
30K → 20M16211+151#16141#15990
20M → 21M18519+166#15990#15824
21M → 35K8420+64#15824#15760
35K → 23M14313+130#15760#15630
23M → 24M2025+197#15630#15433
24M → 40K1815+176#15433#15257
40K → 25.2M1153+112#15257#15145
25.2M → Finish1883+185#15145#14960
TOTALS3026845+2181
📊

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