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BOSTON MARATHON 2023

Jennifer Kloska

Bib: 19687•F

FL

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Top 45%
Masters (Masters Women)
#0 / 6539
Top 34%
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
8:26/mi
26:13
↑ 97↓ 3451.5%
10K· 6.21 mi
8:18/mi
52:01
↑ 79↓ 1380.4%
15K· 9.32 mi
8:18/mi
1:17:47
↑ 67↓ 78
20K· 12.43 mi
8:20/mi
1:43:39
↑ 106↓ 860.1%
Half· 13.11 mi
8:17/mi
1:49:18
↑ 19↓ 370.5%
25K· 15.53 mi
8:21/mi
2:09:33
↑ 66↓ 880.2%
30K· 18.64 mi
8:39/mi
2:36:25
↑ 181↓ 1480.2%
20M
8:47/mi
2:48:21
↑ 64↓ 500.2%
21M
9:09/mi
2:57:30
↑ 106↓ 241.6%
35K· 21.75 mi
8:36/mi
3:03:56
↑ 17↓ 861.7%
23M
9:01/mi
3:15:13
↑ 23↓ 630.6%
24M
8:30/mi
3:23:43
↓ 821.3%
40K· 24.85 mi
8:45/mi
3:31:12
↓ 200.3%
25.2M
8:48/mi
3:34:14
↑ 13↓ 160.2%
Finish· 26.22 mi
7:45/mi
3:42:08
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:49:18
Pace8:20 /mi
2nd Half
Distance13.11 mi
Time1:52:50
Pace8:36 /mi
📊Positive Split: 3.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:18:1226:138:2626:13
8:26
-
10K
6.21 mi11:44:0052:018:2225:48
8:18
-0:08
15K
9.32 mi12:09:461:17:478:2125:46
8:18
0:00
20K
12.43 mi12:35:381:43:398:2025:52
8:20
+0:02
Half
13.11 mi12:41:171:49:188:205:39
8:17
-0:03
25K
15.53 mi13:01:322:09:338:2020:15
8:21
+0:04
30K
18.64 mi13:28:242:36:258:2326:52
8:39
+0:18
20M
20.00 mi13:40:202:48:218:2511:56
8:47
+0:08
21M
21.00 mi13:49:292:57:308:279:09
9:09
+0:22
35K
21.75 mi13:55:553:03:568:276:26
8:36
-0:33
23M
23.00 mi14:07:123:15:138:2911:17
9:01
+0:25
24M
24.00 mi14:15:423:23:438:298:30
8:30
-0:31
40K
24.85 mi14:23:113:31:128:307:29
8:45
+0:15
25.2M
25.20 mi14:26:133:34:148:303:02
8:48
+0:03
Finish
26.22 mi14:34:073:42:088:297:54
7:45
-1:03

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

7:45 /mi

Average Pace

8:29 /mi

Slowest Pace

9:09 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:25:57

66% of race

Time at Steady Pace

1:07:02

30% of race

Time at Slower Pace

9:09

4% of race

Average Pace: 8:28 /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 mi11:18:1226:138:2626:13
8:26
#17144
10K
6.21 mi11:44:0052:018:2225:48
8:18
#16999
15K
9.32 mi12:09:461:17:478:2125:46
8:18
#16819
20K
12.43 mi12:35:381:43:398:2025:52
8:20
#16551
Half
13.11 mi12:41:171:49:188:205:39
8:17
#16554
25K
15.53 mi13:01:322:09:338:2020:15
8:21
#16326
30K
18.64 mi13:28:242:36:258:2326:52
8:39
#16088
20M
20.00 mi13:40:202:48:218:2511:56
8:47
#16016
21M
21.00 mi13:49:292:57:308:279:09
9:09
#15879
35K
21.75 mi13:55:553:03:568:276:26
8:36
#15840
23M
23.00 mi14:07:123:15:138:2911:17
9:01
#15870
24M
24.00 mi14:15:423:23:438:298:30
8:30
#15797
40K
24.85 mi14:23:113:31:128:307:29
8:45
#15755
25.2M
25.20 mi14:26:133:34:148:303:02
8:48
#15679
Finish
26.22 mi14:34:073:42:088:297:54
7:45
#15481
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi171446026602616505(Top 62%)5595(Top 49%)5595(Top 298%)
10K6.21 mi3.10 mi16999+1455913+1135913+11316954(Top 64%)5844(Top 51%)5844(Top 311%)
15K9.32 mi3.11 mi16819+1805804+1095804+10916505(Top 62%)5595(Top 49%)5595(Top 298%)
20K12.43 mi3.11 mi16551+2685646+1585646+15815777(Top 59%)5212(Top 46%)5212(Top 278%)
Half13.11 mi0.68 mi16554-35648-25648-216390(Top 62%)5522(Top 48%)5522(Top 294%)
25K15.53 mi2.42 mi16326+2285527+1215527+12115288(Top 57%)5012(Top 44%)5012(Top 267%)
30K18.64 mi3.11 mi16088+2385427+1005427+10015216(Top 57%)5070(Top 44%)5070(Top 270%)
20M20.00 mi1.36 mi16016+725402+255402+2515331(Top 58%)5180(Top 45%)5180(Top 276%)
21M21.00 mi1.00 mi15879+1375343+595343+5914245(Top 54%)4622(Top 40%)4622(Top 246%)
35K21.75 mi0.75 mi15840+395336+75336+715874(Top 60%)5609(Top 49%)5609(Top 299%)
23M23.00 mi1.25 mi15870-305379-435379-4316133(Top 61%)5813(Top 51%)5813(Top 310%)
24M24.00 mi1.00 mi15797+735359+205359+2014500(Top 54%)4957(Top 43%)4957(Top 264%)
40K24.85 mi0.85 mi15755+425336+235336+2314849(Top 56%)5211(Top 46%)5211(Top 277%)
25.2M25.20 mi0.35 mi15679+765291+455291+4511440(Top 43%)3452(Top 30%)3452(Top 184%)
Finish26.22 mi1.02 mi15481+1985197+945197+9410374(Top 39%)2891(Top 25%)2891(Top 154%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 62%
×21story building
+97ft-345ft

Overall

16505

Females

5595

F40-44

5595

5K→10K

3.1 - 6.2 mi

Top 64%
×5story building
+79ft-138ft

Overall

16954

Females

5844

F40-44

5844

10K→15K

6.2 - 9.3 mi

Top 62%
×3story building
+67ft-78ft

Overall

16505

Females

5595

F40-44

5595

15K→20K

9.3 - 12.4 mi

Top 59%
×5story building
+106ft-86ft

Overall

15777

Females

5212

F40-44

5212

20K→Half

12.4 - 13.1 mi

Top 62%
×2story building
+19ft-37ft

Overall

16390

Females

5522

F40-44

5522

Half→25K

13.1 - 15.5 mi

Top 57%
×4story building
+66ft-88ft

Overall

15288

Females

5012

F40-44

5012

25K→30K

15.5 - 18.6 mi

Top 57%
×9story building
+181ft-148ft

Overall

15216

Females

5070

F40-44

5070

30K→20M

18.6 - 20.0 mi

Top 58%
×5story building
+64ft-50ft

Overall

15331

Females

5180

F40-44

5180

20M→21M

20.0 - 21.0 mi

Top 54%
×8story building
+106ft-24ft

Overall

14245

Females

4622

F40-44

4622

21M→35K

21.0 - 21.8 mi

Top 60%
×7story building
+17ft-86ft

Overall

15874

Females

5609

F40-44

5609

35K→23M

21.8 - 23.0 mi

Top 61%
×5story building
+23ft-63ft

Overall

16133

Females

5813

F40-44

5813

23M→24M

23.0 - 24.0 mi

Top 54%
×6story building
+12ft-82ft

Overall

14500

Females

4957

F40-44

4957

24M→40K

24.0 - 24.9 mi

Top 56%
×1story
+6ft-20ft

Overall

14849

Females

5211

F40-44

5211

40K→25.2M

24.9 - 25.2 mi

Top 43%
×1story
+13ft-16ft

Overall

11440

Females

3452

F40-44

3452

25.2M→Finish

25.2 - 26.2 mi

Top 39%
×2story building
+22ft-21ft

Overall

10374

Females

2891

F40-44

2891

Passing Analysis

Category:
Athletes Passed
2505
Passed By
842
Net Change
+1663
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17144
5K → 10K392247+145#17144#16999
10K → 15K305125+180#16999#16819
15K → 20K32456+268#16819#16551
20K → Half3437-3#16551#16554
Half → 25K26638+228#16554#16326
25K → 30K30163+238#16326#16088
30K → 20M11139+72#16088#16016
20M → 21M16124+137#16016#15879
21M → 35K6829+39#15879#15840
35K → 23M75105-30#15840#15870
23M → 24M11138+73#15870#15797
24M → 40K7937+42#15797#15755
40K → 25.2M782+76#15755#15679
25.2M → Finish2002+198#15679#15481
TOTALS2505842+1663
📊

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