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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing
BOSTON MARATHON 2026

Shannon Seiferth

Bib: 18244 •F •Age: N/A

CO

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0:00
0:00
/ mi
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Overall
#0 / 29021
Gender (Female)
#0 / 12578
Age Group (F18-39)
#0 / 5716
Race Day Weather
51°/41°F
overcast clouds
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  • Qualification readiness
  • Segment-by-segment breakdown
  • Personalized race insights
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Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
23:34
3.11 mi
Rank: #13530
Start → 5K
23:34 | 7:36/mi
10K
48:18
6.21 mi
Rank: #15254 (-1724)
5K → 10K
24:44 | 7:58/mi
15K
1:14:33
9.32 mi
Rank: #17053 (-1799)
10K → 15K
26:15 | 8:27/mi
20K
1:40:44
12.43 mi
Rank: #17558 (-505)
15K → 20K
26:11 | 8:26/mi
HALF
1:46:27
13.11 mi
Rank: #17668 (-110)
20K → HALF
5:43 | 8:24/mi
25K
2:08:50
15.53 mi
Rank: #18494 (-826)
HALF → 25K
22:23 | 9:14/mi
30K
2:37:54
18.64 mi
Rank: #19020 (-526)
25K → 30K
29:04 | 9:22/mi
20M
2:50:39
20.00 mi
Rank: #19177 (-157)
30K → 20M
12:45 | 9:24/mi
21M
3:00:33
21.00 mi
Rank: #19236 (-59)
20M → 21M
9:54 | 9:54/mi
35K
3:07:32
21.75 mi
Rank: #19327 (-91)
21M → 35K
6:59 | 9:21/mi
23M
3:19:47
23.00 mi
Rank: #19526 (-199)
35K → 23M
12:15 | 9:48/mi
24M
3:29:15
24.00 mi
Rank: #19638 (-112)
23M → 24M
9:28 | 9:28/mi
40K
3:37:19
24.85 mi
Rank: #19674 (-36)
24M → 40K
8:04 | 9:27/mi
25.2M
3:40:43
25.20 mi
Rank: #19658 (+16)
40K → 25.2M
3:24 | 9:52/mi
FINISH
3:49:31
26.22 mi
Rank: #19639 (+19)
25.2M → FINISH
8:48 | 8:39/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time1:46:27
Pace8:08 /mi
2nd Half
Distance13.11 mi
Time2:03:04
Pace9:24 /mi
📊Positive Split: 15.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:07:0023:347:3623:34
7:36
-
10K
6.21 mi11:31:4448:187:4724:44
7:58
+0:22
15K
9.32 mi11:57:591:14:338:0026:15
8:27
+0:29
20K
12.43 mi12:24:101:40:448:0726:11
8:26
-0:01
HALF
13.11 mi12:29:531:46:278:085:43
8:24
-0:02
25K
15.53 mi12:52:162:08:508:1822:23
9:14
+0:50
30K
18.64 mi13:21:202:37:548:2929:04
9:22
+0:08
20M
20.00 mi13:34:052:50:398:3212:45
9:24
+0:02
21M
21.00 mi13:43:593:00:338:369:54
9:54
+0:30
35K
21.75 mi13:50:583:07:328:386:59
9:21
-0:33
23M
23.00 mi14:03:133:19:478:4212:15
9:48
+0:27
24M
24.00 mi14:12:413:29:158:449:28
9:28
-0:20
40K
24.85 mi14:20:453:37:198:458:04
9:27
-0:01
25.2M
25.20 mi14:24:093:40:438:463:24
9:52
+0:25
FINISH
26.22 mi14:32:573:49:318:468:48
8:39
-1:13

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

7:36 /mi

Average Pace

8:46 /mi

Slowest Pace

9:54 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

1:55:15

50% of race

Time at Steady Pace

1:28:43

39% of race

Time at Slower Pace

25:33

11% of race

Average Pace: 8:45 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:07:0023:347:3623:34
7:36
#13530
10K
6.21 mi11:31:4448:187:4724:44
7:58
#15254
15K
9.32 mi11:57:591:14:338:0026:15
8:27
#17053
20K
12.43 mi12:24:101:40:448:0726:11
8:26
#17558
HALF
13.11 mi12:29:531:46:278:085:43
8:24
#17668
25K
15.53 mi12:52:162:08:508:1822:23
9:14
#18494
30K
18.64 mi13:21:202:37:548:2929:04
9:22
#19020
20M
20.00 mi13:34:052:50:398:3212:45
9:24
#19177
21M
21.00 mi13:43:593:00:338:369:54
9:54
#19236
35K
21.75 mi13:50:583:07:328:386:59
9:21
#19327
23M
23.00 mi14:03:133:19:478:4212:15
9:48
#19526
24M
24.00 mi14:12:413:29:158:449:28
9:28
#19638
40K
24.85 mi14:20:453:37:198:458:04
9:27
#19674
25.2M
25.20 mi14:24:093:40:438:463:24
9:52
#19658
FINISH
26.22 mi14:32:573:49:318:468:48
8:39
#19639
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi135303799379919844(Top 68%)7502(Top 60%)7502(Top 131%)
10K6.21 mi3.10 mi15254-17244874-10754874-107516959(Top 58%)5894(Top 47%)5894(Top 103%)
15K9.32 mi3.11 mi17053-17995960-10865960-108619844(Top 68%)7502(Top 60%)7502(Top 131%)
20K12.43 mi3.11 mi17558-5056251-2916251-29118893(Top 65%)7017(Top 56%)7017(Top 123%)
HALF13.11 mi0.68 mi17668-1106308-576308-5719603(Top 68%)7382(Top 59%)7382(Top 129%)
25K15.53 mi2.42 mi18494-8266783-4756783-47522153(Top 76%)8753(Top 70%)8753(Top 153%)
30K18.64 mi3.11 mi19020-5267120-3377120-33721154(Top 73%)8343(Top 66%)8343(Top 146%)
20M20.00 mi1.36 mi19177-1577215-957215-9520635(Top 71%)8152(Top 65%)8152(Top 143%)
21M21.00 mi1.00 mi19236-597262-477262-4720103(Top 69%)7914(Top 63%)7914(Top 138%)
35K21.75 mi0.75 mi19327-917329-677329-6721288(Top 73%)8587(Top 68%)8587(Top 150%)
23M23.00 mi1.25 mi19526-1997471-1427471-14221535(Top 74%)8752(Top 70%)8752(Top 153%)
24M24.00 mi1.00 mi19638-1127541-707541-7021235(Top 73%)8654(Top 69%)8654(Top 151%)
40K24.85 mi0.85 mi19674-367569-287569-2820149(Top 69%)8143(Top 65%)8143(Top 142%)
25.2M25.20 mi0.35 mi19658+167566+37566+318911(Top 65%)7512(Top 60%)7512(Top 131%)
FINISH26.22 mi1.02 mi19639+197564+27564+218862(Top 65%)7494(Top 60%)7494(Top 131%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 68%
×21
+97ft-345ft

Overall

19844

Females

7502

F18-39

7502

5K→10K

3.1 - 6.2 mi

Top 58%
×5
+79ft-138ft

Overall

16959

Females

5894

F18-39

5894

10K→15K

6.2 - 9.3 mi

Top 68%
×3
+67ft-78ft

Overall

19844

Females

7502

F18-39

7502

15K→20K

9.3 - 12.4 mi

Top 65%
×5
+106ft-86ft

Overall

18893

Females

7017

F18-39

7017

20K→HALF

12.4 - 13.1 mi

Top 68%
×2
+19ft-37ft

Overall

19603

Females

7382

F18-39

7382

HALF→25K

13.1 - 15.5 mi

Top 76%
×4
+66ft-88ft

Overall

22153

Females

8753

F18-39

8753

25K→30K

15.5 - 18.6 mi

Top 73%
×9
+181ft-148ft

Overall

21154

Females

8343

F18-39

8343

30K→20M

18.6 - 20.0 mi

Top 71%
×5
+64ft-50ft

Overall

20635

Females

8152

F18-39

8152

20M→21M

20.0 - 21.0 mi

Top 69%
×8
+106ft-24ft

Overall

20103

Females

7914

F18-39

7914

21M→35K

21.0 - 21.8 mi

Top 73%
×7
+17ft-86ft

Overall

21288

Females

8587

F18-39

8587

35K→23M

21.8 - 23.0 mi

Top 74%
×5
+23ft-63ft

Overall

21535

Females

8752

F18-39

8752

23M→24M

23.0 - 24.0 mi

Top 73%
×6
+12ft-82ft

Overall

21235

Females

8654

F18-39

8654

24M→40K

24.0 - 24.9 mi

Top 69%
×1
+6ft-20ft

Overall

20149

Females

8143

F18-39

8143

40K→25.2M

24.9 - 25.2 mi

Top 65%
×1
+13ft-16ft

Overall

18911

Females

7512

F18-39

7512

25.2M→FINISH

25.2 - 26.2 mi

Top 65%
×2
+22ft-21ft

Overall

18862

Females

7494

F18-39

7494

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
590
Passed By
2075
Net Change
-6109
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13530
5K → 10K23200-1724#13530#15254
10K → 15K12200-1799#15254#17053
15K → 20K56200-505#17053#17558
20K → HALF15125-110#17558#17668
HALF → 25K24200-826#17668#18494
25K → 30K73200-526#18494#19020
30K → 20M55200-157#19020#19177
20M → 21M62121-59#19177#19236
21M → 35K33124-91#19236#19327
35K → 23M45200-199#19327#19526
23M → 24M45157-112#19526#19638
24M → 40K3975-36#19638#19674
40K → 25.2M3620+16#19674#19658
25.2M → FINISH7253+19#19658#19639
TOTALS5902075-6109
📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

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🎨Heatmap Timeline

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Qualifying & Age Grade

See how your performance stacks up against qualifying standards

OTQ

Olympic Trials Qualifying analysis available

Activity Data

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