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BOSTON MARATHON 2023

Kari Boster

Bib: 23180•F

MN

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Masters (Masters Women)
#0 / 6539
Division (F50-54)
#0 / 1207
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
8:48/mi
27:19
↑ 97↓ 3451.5%
10K· 6.21 mi
8:51/mi
54:48
↑ 79↓ 1380.4%
15K· 9.32 mi
9:00/mi
1:22:47
↑ 67↓ 78
20K· 12.43 mi
9:09/mi
1:51:12
↑ 106↓ 860.1%
Half· 13.11 mi
8:46/mi
1:57:11
↑ 19↓ 370.5%
25K· 15.53 mi
9:14/mi
2:19:34
↑ 66↓ 880.2%
30K· 18.64 mi
10:03/mi
2:50:46
↑ 181↓ 1480.2%
20M
10:06/mi
3:04:30
↑ 64↓ 500.2%
21M
10:43/mi
3:15:13
↑ 106↓ 241.6%
35K· 21.75 mi
9:55/mi
3:22:38
↑ 17↓ 861.7%
23M
10:12/mi
3:35:24
↑ 23↓ 630.6%
24M
10:01/mi
3:45:25
↓ 821.3%
40K· 24.85 mi
11:22/mi
3:55:08
↓ 200.3%
25.2M
11:01/mi
3:58:56
↑ 13↓ 160.2%
Finish· 26.22 mi
10:10/mi
4:09:18
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:57:11
Pace8:56 /mi
2nd Half
Distance13.11 mi
Time2:12:07
Pace10:05 /mi
📊Positive Split: 12.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:22:4127:198:4827:19
8:48
-
10K
6.21 mi11:50:1054:488:4927:29
8:51
+0:03
15K
9.32 mi12:18:091:22:478:5327:59
9:00
+0:09
20K
12.43 mi12:46:341:51:128:5728:25
9:09
+0:09
Half
13.11 mi12:52:331:57:118:565:59
8:46
-0:23
25K
15.53 mi13:14:562:19:348:5922:23
9:14
+0:28
30K
18.64 mi13:46:082:50:469:1031:12
10:03
+0:49
20M
20.00 mi13:59:523:04:309:1313:44
10:06
+0:03
21M
21.00 mi14:10:353:15:139:1810:43
10:43
+0:37
35K
21.75 mi14:18:003:22:389:197:25
9:55
-0:48
23M
23.00 mi14:30:463:35:249:2212:46
10:12
+0:17
24M
24.00 mi14:40:473:45:259:2410:01
10:01
-0:11
40K
24.85 mi14:50:303:55:089:289:43
11:22
+1:21
25.2M
25.20 mi14:54:183:58:569:293:48
11:01
-0:21
Finish
26.22 mi15:04:404:09:189:3110:22
10:10
-0:51

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

8:46 /mi

Average Pace

9:31 /mi

Slowest Pace

11:22 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:19:34

56% of race

Time at Steady Pace

1:25:30

34% of race

Time at Slower Pace

24:14

10% of race

Average Pace: 9:30 /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 mi11:22:4127:198:4827:19
8:48
#19429
10K
6.21 mi11:50:1054:488:4927:29
8:51
#19793
15K
9.32 mi12:18:091:22:478:5327:59
9:00
#20042
20K
12.43 mi12:46:341:51:128:5728:25
9:09
#20106
Half
13.11 mi12:52:331:57:118:565:59
8:46
#20075
25K
15.53 mi13:14:562:19:348:5922:23
9:14
#20048
30K
18.64 mi13:46:082:50:469:1031:12
10:03
#20310
20M
20.00 mi13:59:523:04:309:1313:44
10:06
#20350
21M
21.00 mi14:10:353:15:139:1810:43
10:43
#20321
35K
21.75 mi14:18:003:22:389:197:25
9:55
#20336
23M
23.00 mi14:30:463:35:249:2212:46
10:12
#20348
24M
24.00 mi14:40:473:45:259:2410:01
10:01
#20367
40K
24.85 mi14:50:303:55:089:289:43
11:22
#20499
25.2M
25.20 mi14:54:183:58:569:293:48
11:01
#20499
Finish
26.22 mi15:04:404:09:189:3110:22
10:10
#20574
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi194297463746320541(Top 77%)7980(Top 70%)7980(Top 661%)
10K6.21 mi3.10 mi19793-3647647-1847647-18420176(Top 76%)7806(Top 68%)7806(Top 647%)
15K9.32 mi3.11 mi20042-2497765-1187765-11820541(Top 77%)7980(Top 70%)7980(Top 661%)
20K12.43 mi3.11 mi20106-647775-107775-1020356(Top 76%)7877(Top 69%)7877(Top 653%)
Half13.11 mi0.68 mi20075+317759+167759+1619396(Top 73%)7329(Top 64%)7329(Top 607%)
25K15.53 mi2.42 mi20048+277735+247735+2419970(Top 75%)7673(Top 67%)7673(Top 636%)
30K18.64 mi3.11 mi20310-2627905-1707905-17021146(Top 79%)8428(Top 74%)8428(Top 698%)
20M20.00 mi1.36 mi20350-407941-367941-3620764(Top 78%)8284(Top 73%)8284(Top 686%)
21M21.00 mi1.00 mi20321+297932+97932+920193(Top 76%)8030(Top 70%)8030(Top 665%)
35K21.75 mi0.75 mi20336-157953-217953-2121051(Top 79%)8513(Top 75%)8513(Top 705%)
23M23.00 mi1.25 mi20348-127967-147967-1420564(Top 77%)8273(Top 72%)8273(Top 685%)
24M24.00 mi1.00 mi20367-197985-187985-1820839(Top 78%)8455(Top 74%)8455(Top 700%)
40K24.85 mi0.85 mi20499-1328072-878072-8723007(Top 86%)9660(Top 85%)9660(Top 800%)
25.2M25.20 mi0.35 mi204998073-18073-120538(Top 77%)8340(Top 73%)8340(Top 691%)
Finish26.22 mi1.02 mi20574-758128-558128-5522224(Top 83%)9241(Top 81%)9241(Top 766%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 77%
×21story building
+97ft-345ft

Overall

20541

Females

7980

F50-54

7980

5K→10K

3.1 - 6.2 mi

Top 76%
×5story building
+79ft-138ft

Overall

20176

Females

7806

F50-54

7806

10K→15K

6.2 - 9.3 mi

Top 77%
×3story building
+67ft-78ft

Overall

20541

Females

7980

F50-54

7980

15K→20K

9.3 - 12.4 mi

Top 76%
×5story building
+106ft-86ft

Overall

20356

Females

7877

F50-54

7877

20K→Half

12.4 - 13.1 mi

Top 73%
×2story building
+19ft-37ft

Overall

19396

Females

7329

F50-54

7329

Half→25K

13.1 - 15.5 mi

Top 75%
×4story building
+66ft-88ft

Overall

19970

Females

7673

F50-54

7673

25K→30K

15.5 - 18.6 mi

Top 79%
×9story building
+181ft-148ft

Overall

21146

Females

8428

F50-54

8428

30K→20M

18.6 - 20.0 mi

Top 78%
×5story building
+64ft-50ft

Overall

20764

Females

8284

F50-54

8284

20M→21M

20.0 - 21.0 mi

Top 76%
×8story building
+106ft-24ft

Overall

20193

Females

8030

F50-54

8030

21M→35K

21.0 - 21.8 mi

Top 79%
×7story building
+17ft-86ft

Overall

21051

Females

8513

F50-54

8513

35K→23M

21.8 - 23.0 mi

Top 77%
×5story building
+23ft-63ft

Overall

20564

Females

8273

F50-54

8273

23M→24M

23.0 - 24.0 mi

Top 78%
×6story building
+12ft-82ft

Overall

20839

Females

8455

F50-54

8455

24M→40K

24.0 - 24.9 mi

Top 86%
×1story
+6ft-20ft

Overall

23007

Females

9660

F50-54

9660

40K→25.2M

24.9 - 25.2 mi

Top 77%
×1story
+13ft-16ft

Overall

20538

Females

8340

F50-54

8340

25.2M→Finish

25.2 - 26.2 mi

Top 83%
×2story building
+22ft-21ft

Overall

22224

Females

9241

F50-54

9241

Passing Analysis

Category:
Athletes Passed
1021
Passed By
2166
Net Change
-1145
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19429
5K → 10K162526-364#19429#19793
10K → 15K94343-249#19793#20042
15K → 20K146210-64#20042#20106
20K → Half4918+31#20106#20075
Half → 25K144117+27#20075#20048
25K → 30K80342-262#20048#20310
30K → 20M65105-40#20310#20350
20M → 21M8354+29#20350#20321
21M → 35K3752-15#20321#20336
35K → 23M6173-12#20336#20348
23M → 24M3150-19#20348#20367
24M → 40K17149-132#20367#20499
40K → 25.2M28280#20499#20499
25.2M → Finish2499-75#20499#20574
TOTALS10212166-1145
📊

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