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BOSTON MARATHON 2023

Heather Czarnecki

MI

Bib: 15118 F

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 27%
Gender (Female)
#0 / 11423
Top 9%
Division (F18-39)
#0 / 4884
Top 17%
Race Day Weather
49°/39°F
light intensity drizzle

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:33/mi
23:27
↑ 97↓ 345
10K· 6.21 mi
7:25/mi
46:29
↑ 79↓ 138
15K· 9.32 mi
7:14/mi
1:08:56
↑ 67↓ 78
20K· 12.43 mi
7:20/mi
1:31:44
↑ 106↓ 86
Half· 13.11 mi
7:20/mi
1:36:44
↑ 19↓ 37
25K· 15.53 mi
7:51/mi
1:55:46
↑ 66↓ 88
30K· 18.64 mi
7:25/mi
2:18:50
↑ 181↓ 148
20M
7:22/mi
2:28:50
↑ 64↓ 50
21M
7:40/mi
2:36:30
↑ 106↓ 24
35K· 21.75 mi
6:58/mi
2:41:43
↑ 17↓ 86
23M
7:23/mi
2:50:58
↑ 23↓ 63
24M
7:13/mi
2:58:11
↓ 82
40K· 24.85 mi
7:03/mi
3:04:13
↓ 20
25.2M
7:12/mi
3:06:42
↑ 13↓ 16
Finish· 26.22 mi
6:31/mi
3:13:20
↑ 22↓ 21
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:36:447:23 /mi⚖️ balanced
2nd Half
1:36:367:22 /mi⚖️ balanced
Even split — consistent pacing between halves
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Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointTimeAvg PaceSegment LengthSegment TimeSegment PaceTrendDiff
5K
23:277:333.11 mi23:27
7:33
-
10K
46:297:293.10 mi23:02
7:25
-0:08
15K
1:08:567:243.11 mi22:27
7:14
-0:11
20K
1:31:447:233.11 mi22:48
7:20
+0:06
Half(13.11 mi)
1:36:447:230.68 mi5:00
7:20
0:00
25K
1:55:467:272.42 mi19:02
7:51
+0:31
30K
2:18:507:273.11 mi23:04
7:25
-0:26
20M
2:28:507:261.36 mi10:00
7:22
-0:03
21M
2:36:307:271.00 mi7:40
7:40
+0:18
35K
2:41:437:260.75 mi5:13
6:58
-0:42
23M
2:50:587:261.25 mi9:15
7:23
+0:25
24M
2:58:117:251.00 mi7:13
7:13
-0:10
40K
3:04:137:250.85 mi6:02
7:03
-0:10
25.2M
3:06:427:250.35 mi2:29
7:12
+0:09
Finish(26.22 mi)
3:13:207:231.02 mi6:38
6:31
-0:41
Trend:
Faster pace
Steady pace
Slower pace

Checkpoints & Pacing

Pace Line

Fastest Pace

6:31 /mi

Average Pace

7:23 /mi

Slowest Pace

7:51 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Time at Faster Pace

17:53

9% of race

Time at Steady Pace

2:05:18

65% of race

Time at Slower Pace

50:09

26% of race

Average Pace: 7:22 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

Heatmap

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0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Checkpoint and Segment Rankings

CheckpointSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi1006118861886798810631063
10K3.10 mi9841+2201759+1271759+127975517061706
15K3.11 mi9155+6861481+2781481+278798810631063
20K3.11 mi8861+2941378+1031378+103808311291129
Half(13.11 mi)0.68 mi8848+131377+11377+1885114011401
25K2.42 mi9251-4031546-1691546-1691151427692769
30K3.11 mi8734+5171384+1621384+1626752849849
20M1.36 mi8492+2421314+701314+705990708708
21M1.00 mi8286+2061254+601254+605479661661
35K0.75 mi8141+1451217+371217+375244565565
23M1.25 mi7946+1951167+501167+505820761761
24M1.00 mi7824+1221141+261141+265867847847
40K0.85 mi7626+1981082+591082+594185453453
25.2M0.35 mi7530+961066+161066+162617209209
Finish(26.22 mi)1.02 mi7261+2691004+621004+622571211211

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 30%
×21story building
+97ft-345ft

Overall

7988

Females

1063

F18-39

1063

5K→10K

3.1 - 6.2 mi

Top 37%
×5story building
+79ft-138ft

Overall

9755

Females

1706

F18-39

1706

10K→15K

6.2 - 9.3 mi

Top 30%
×3story building
+67ft-78ft

Overall

7988

Females

1063

F18-39

1063

15K→20K

9.3 - 12.4 mi

Top 30%
×5story building
+106ft-86ft

Overall

8083

Females

1129

F18-39

1129

20K→Half

12.4 - 13.1 mi

Top 33%
×2story building
+19ft-37ft

Overall

8851

Females

1401

F18-39

1401

Half→25K

13.1 - 15.5 mi

Top 43%
×4story building
+66ft-88ft

Overall

11514

Females

2769

F18-39

2769

25K→30K

15.5 - 18.6 mi

Top 25%
×9story building
+181ft-148ft

Overall

6752

Females

849

F18-39

849

30K→20M

18.6 - 20.0 mi

Top 23%
×5story building
+64ft-50ft

Overall

5990

Females

708

F18-39

708

20M→21M

20.0 - 21.0 mi

Top 21%
×8story building
+106ft-24ft

Overall

5479

Females

661

F18-39

661

21M→35K

21.0 - 21.8 mi

Top 20%
×7story building
+17ft-86ft

Overall

5244

Females

565

F18-39

565

35K→23M

21.8 - 23.0 mi

Top 22%
×5story building
+23ft-63ft

Overall

5820

Females

761

F18-39

761

23M→24M

23.0 - 24.0 mi

Top 22%
×6story building
+12ft-82ft

Overall

5867

Females

847

F18-39

847

24M→40K

24.0 - 24.9 mi

Top 16%
×1story
+6ft-20ft

Overall

4185

Females

453

F18-39

453

40K→25.2M

24.9 - 25.2 mi

Top 10%
×1story
+13ft-16ft

Overall

2617

Females

209

F18-39

209

25.2M→Finish

25.2 - 26.2 mi

Top 10%
×2story building
+22ft-21ft

Overall

2571

Females

211

F18-39

211

Passing Analysis

Category:
▲Net Change
+0
0 passed by0* passed
SegmentMovementRank
Start → 5K-#10061
5K → 10K
209429*+220
#10061 → #9841
10K → 15K
9695+686
#9841 → #9155
15K → 20K
20314+294
#9155 → #8861
20K → Half
1932+13
#8861 → #8848
Half → 25K
43330-403
#8848 → #9251
25K → 30K
12529+517
#9251 → #8734
30K → 20M
2244+242
#8734 → #8492
20M → 21M
3209+206
#8492 → #8286
21M → 35K
1146+145
#8286 → #8141
35K → 23M
9204+195
#8141 → #7946
23M → 24M
16138+122
#7946 → #7824
24M → 40K
1199+198
#7824 → #7626
40K → 25.2M
096+96
#7626 → #7530
25.2M → Finish
1270+269
#7530 → #7261
TOTALS
7353535*+2800
#10061 → #7261

* Includes athletes who did not complete a segment (DNF/DNQ).

Passing Visualized

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