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BOSTON MARATHON 2025

Shannon Harlow

Bib: 31682•M

NJ

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

⏱️ 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
9:11/mi
28:32
↑ 97↓ 3451.5%
10K· 6.21 mi
8:44/mi
55:39
↑ 79↓ 1380.4%
15K· 9.32 mi
8:54/mi
1:23:19
↑ 67↓ 78
20K· 12.43 mi
8:46/mi
1:50:34
↑ 106↓ 860.1%
Half· 13.11 mi
8:45/mi
1:56:32
↑ 19↓ 370.5%
25K· 15.53 mi
8:51/mi
2:18:00
↑ 66↓ 880.2%
30K· 18.64 mi
10:04/mi
2:49:18
↑ 181↓ 1480.2%
20M
11:23/mi
3:04:46
↑ 64↓ 500.2%
21M
11:57/mi
3:16:43
↑ 106↓ 241.6%
35K· 21.75 mi
10:28/mi
3:24:33
↑ 17↓ 861.7%
23M
10:50/mi
3:38:07
↑ 23↓ 630.6%
24M
10:49/mi
3:48:56
↓ 821.3%
40K· 24.85 mi
10:54/mi
3:58:15
↓ 200.3%
25.2M
11:42/mi
4:02:17
↑ 13↓ 160.2%
Finish· 26.22 mi
9:34/mi
4:12:02
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:56:32
Pace8:53 /mi
2nd Half
Distance13.11 mi
Time2:15:30
Pace10:20 /mi
📊Positive Split: 16.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:50:4228:329:1128:32
9:11
-
10K
6.21 mi12:17:4955:398:5727:07
8:44
-0:27
15K
9.32 mi12:45:291:23:198:5627:40
8:54
+0:10
20K
12.43 mi13:12:441:50:348:5427:15
8:46
-0:08
Half
13.11 mi13:18:421:56:328:535:58
8:45
-0:01
25K
15.53 mi13:40:102:18:008:5321:28
8:51
+0:06
30K
18.64 mi14:11:282:49:189:0531:18
10:04
+1:13
20M
20.00 mi14:26:563:04:469:1415:28
11:23
+1:19
21M
21.00 mi14:38:533:16:439:2211:57
11:57
+0:34
35K
21.75 mi14:46:433:24:339:247:50
10:28
-1:29
23M
23.00 mi15:00:173:38:079:2913:34
10:50
+0:22
24M
24.00 mi15:11:063:48:569:3210:49
10:49
-0:01
40K
24.85 mi15:20:253:58:159:359:19
10:54
+0:05
25.2M
25.20 mi15:24:274:02:179:374:02
11:42
+0:48
Finish
26.22 mi15:34:124:12:029:379:45
9:34
-2:08

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

8:44 /mi

Average Pace

9:37 /mi

Slowest Pace

11:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:18:00

55% of race

Time at Steady Pace

48:53

19% of race

Time at Slower Pace

1:05:09

26% of race

Average Pace: 9:37 /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 mi11:50:4228:329:1128:32
9:11
#23167
10K
6.21 mi12:17:4955:398:5727:07
8:44
#22230
15K
9.32 mi12:45:291:23:198:5627:40
8:54
#22015
20K
12.43 mi13:12:441:50:348:5427:15
8:46
#21432
Half
13.11 mi13:18:421:56:328:535:58
8:45
#21385
25K
15.53 mi13:40:102:18:008:5321:28
8:51
#21013
30K
18.64 mi14:11:282:49:189:0531:18
10:04
#21257
20M
20.00 mi14:26:563:04:469:1415:28
11:23
#21632
21M
21.00 mi14:38:533:16:439:2211:57
11:57
#21788
35K
21.75 mi14:46:433:24:339:247:50
10:28
#21852
23M
23.00 mi15:00:173:38:079:2913:34
10:50
#21895
24M
24.00 mi15:11:063:48:569:3210:49
10:49
#21984
40K
24.85 mi15:20:253:58:159:359:19
10:54
#22019
25.2M
25.20 mi15:24:274:02:179:374:02
11:42
#22025
Finish
26.22 mi15:34:124:12:029:379:45
9:34
#21994
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi23167138471384721592(Top 76%)13208(Top 82%)13208(Top 234%)
10K6.21 mi3.10 mi22230+93713427+42013427+42021035(Top 74%)12942(Top 80%)12942(Top 229%)
15K9.32 mi3.11 mi22015+21513344+8313344+8321592(Top 76%)13208(Top 82%)13208(Top 234%)
20K12.43 mi3.11 mi21432+58313093+25113093+25119791(Top 70%)12371(Top 77%)12371(Top 219%)
Half13.11 mi0.68 mi21385+4713073+2013073+2020619(Top 73%)12745(Top 79%)12745(Top 226%)
25K15.53 mi2.42 mi21013+37212915+15812915+15819213(Top 68%)12073(Top 75%)12073(Top 214%)
30K18.64 mi3.11 mi21257-24412977-6212977-6221804(Top 77%)13076(Top 81%)13076(Top 232%)
20M20.00 mi1.36 mi21632-37513136-15913136-15924328(Top 86%)14135(Top 88%)14135(Top 251%)
21M21.00 mi1.00 mi21788-15613184-4813184-4823498(Top 83%)13678(Top 85%)13678(Top 242%)
35K21.75 mi0.75 mi21852-6413198-1413198-1423089(Top 81%)13429(Top 83%)13429(Top 238%)
23M23.00 mi1.25 mi21895-4313181+1713181+1722820(Top 80%)13254(Top 82%)13254(Top 235%)
24M24.00 mi1.00 mi21984-8913197-1613197-1623590(Top 83%)13612(Top 85%)13612(Top 241%)
40K24.85 mi0.85 mi22019-3513195+213195+222887(Top 81%)13184(Top 82%)13184(Top 234%)
25.2M25.20 mi0.35 mi22025-613191+413191+422530(Top 79%)13045(Top 81%)13045(Top 231%)
Finish26.22 mi1.02 mi21994+3113161+3013161+3021422(Top 75%)12496(Top 78%)12496(Top 221%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 76%
×21story building
+97ft-345ft

Overall

21592

Males

13208

M18-39

13208

5K→10K

3.1 - 6.2 mi

Top 74%
×5story building
+79ft-138ft

Overall

21035

Males

12942

M18-39

12942

10K→15K

6.2 - 9.3 mi

Top 76%
×3story building
+67ft-78ft

Overall

21592

Males

13208

M18-39

13208

15K→20K

9.3 - 12.4 mi

Top 70%
×5story building
+106ft-86ft

Overall

19791

Males

12371

M18-39

12371

20K→Half

12.4 - 13.1 mi

Top 73%
×2story building
+19ft-37ft

Overall

20619

Males

12745

M18-39

12745

Half→25K

13.1 - 15.5 mi

Top 68%
×4story building
+66ft-88ft

Overall

19213

Males

12073

M18-39

12073

25K→30K

15.5 - 18.6 mi

Top 77%
×9story building
+181ft-148ft

Overall

21804

Males

13076

M18-39

13076

30K→20M

18.6 - 20.0 mi

Top 86%
×5story building
+64ft-50ft

Overall

24328

Males

14135

M18-39

14135

20M→21M

20.0 - 21.0 mi

Top 83%
×8story building
+106ft-24ft

Overall

23498

Males

13678

M18-39

13678

21M→35K

21.0 - 21.8 mi

Top 81%
×7story building
+17ft-86ft

Overall

23089

Males

13429

M18-39

13429

35K→23M

21.8 - 23.0 mi

Top 80%
×5story building
+23ft-63ft

Overall

22820

Males

13254

M18-39

13254

23M→24M

23.0 - 24.0 mi

Top 83%
×6story building
+12ft-82ft

Overall

23590

Males

13612

M18-39

13612

24M→40K

24.0 - 24.9 mi

Top 81%
×1story
+6ft-20ft

Overall

22887

Males

13184

M18-39

13184

40K→25.2M

24.9 - 25.2 mi

Top 79%
×1story
+13ft-16ft

Overall

22530

Males

13045

M18-39

13045

25.2M→Finish

25.2 - 26.2 mi

Top 75%
×2story building
+22ft-21ft

Overall

21422

Males

12496

M18-39

12496

Passing Analysis

Category:
Athletes Passed
2756
Passed By
1583
Net Change
+1173
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23167
5K → 10K95922+937#23167#22230
10K → 15K30489+215#22230#22015
15K → 20K59613+583#22015#21432
20K → Half6114+47#21432#21385
Half → 25K3797+372#21385#21013
25K → 30K139383-244#21013#21257
30K → 20M24399-375#21257#21632
20M → 21M42198-156#21632#21788
21M → 35K3094-64#21788#21852
35K → 23M69112-43#21852#21895
23M → 24M27116-89#21895#21984
24M → 40K3974-35#21984#22019
40K → 25.2M2127-6#22019#22025
25.2M → Finish6635+31#22025#21994
TOTALS27561583+1173
📊

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