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BOSTON MARATHON 2025

Spencer Dew

Bib: 5138•M

CT

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 13%
Gender (Male)
#0 / 16105
Top 21%
Division (M18-39)
#0 / 5642
Top 44%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:41
Rank: #5080
Start → 5K
20:41 | 6:39/mi
10K· 6.21 mi
41:02
Rank: #4539 (+541)
5K → 10K
20:21 | 6:33/mi
15K· 9.32 mi
1:01:47
Rank: #4617 (-78)
10K → 15K
20:45 | 6:41/mi
20K· 12.43 mi
1:22:37
Rank: #4537 (+80)
15K → 20K
20:50 | 6:42/mi
Half· 13.11 mi
1:27:09
Rank: #4548 (-11)
20K → Half
4:32 | 6:39/mi
25K· 15.53 mi
1:43:18
Rank: #4376 (+172)
Half → 25K
16:09 | 6:40/mi
30K· 18.64 mi
2:04:21
Rank: #4089 (+287)
25K → 30K
21:03 | 6:47/mi
20M
2:13:42
Rank: #4009 (+80)
30K → 20M
9:21 | 6:53/mi
21M
2:20:47
Rank: #3877 (+132)
20M → 21M
7:05 | 7:05/mi
35K· 21.75 mi
2:25:43
Rank: #3827 (+50)
21M → 35K
4:56 | 6:36/mi
23M
2:34:26
Rank: #3778 (+49)
35K → 23M
8:43 | 6:58/mi
24M
2:41:10
Rank: #3727 (+51)
23M → 24M
6:44 | 6:44/mi
40K· 24.85 mi
2:47:17
Rank: #3738 (-11)
24M → 40K
6:07 | 7:09/mi
25.2M
2:49:45
Rank: #3668 (+70)
40K → 25.2M
2:28 | 7:09/mi
Finish· 26.22 mi
2:56:22
Rank: #3585 (+83)
25.2M → Finish
6:37 | 6:30/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:27:09
Pace6:39 /mi
2nd Half
Distance13.11 mi
Time1:29:13
Pace6:48 /mi
📊Positive Split: 2.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:46:3520:416:3920:41
6:39
-
10K
6.21 mi11:06:5641:026:3620:21
6:33
-0:06
15K
9.32 mi11:27:411:01:476:3820:45
6:41
+0:08
20K
12.43 mi11:48:311:22:376:3920:50
6:42
+0:01
Half
13.11 mi11:53:031:27:096:394:32
6:39
-0:03
25K
15.53 mi12:09:121:43:186:3916:09
6:40
+0:01
30K
18.64 mi12:30:152:04:216:4021:03
6:47
+0:07
20M
20.00 mi12:39:362:13:426:419:21
6:53
+0:06
21M
21.00 mi12:46:412:20:476:427:05
7:05
+0:12
35K
21.75 mi12:51:372:25:436:424:56
6:36
-0:29
23M
23.00 mi13:00:202:34:266:438:43
6:58
+0:22
24M
24.00 mi13:07:042:41:106:436:44
6:44
-0:14
40K
24.85 mi13:13:112:47:176:446:07
7:09
+0:25
25.2M
25.20 mi13:15:392:49:456:442:28
7:09
0:00
Finish
26.22 mi13:22:162:56:226:446:37
6:30
-0:39

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

6:30 /mi

Average Pace

6:44 /mi

Slowest Pace

7:09 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:47:47

95% of race

Time at Steady Pace

8:35

5% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:44 /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 mi10:46:3520:416:3920:41
6:39
#5080
10K
6.21 mi11:06:5641:026:3620:21
6:33
#4539
15K
9.32 mi11:27:411:01:476:3820:45
6:41
#4617
20K
12.43 mi11:48:311:22:376:3920:50
6:42
#4537
Half
13.11 mi11:53:031:27:096:394:32
6:39
#4548
25K
15.53 mi12:09:121:43:186:3916:09
6:40
#4376
30K
18.64 mi12:30:152:04:216:4021:03
6:47
#4089
20M
20.00 mi12:39:362:13:426:419:21
6:53
#4009
21M
21.00 mi12:46:412:20:476:427:05
7:05
#3877
35K
21.75 mi12:51:372:25:436:424:56
6:36
#3827
23M
23.00 mi13:00:202:34:266:438:43
6:58
#3778
24M
24.00 mi13:07:042:41:106:436:44
6:44
#3727
40K
24.85 mi13:13:112:47:176:446:07
7:09
#3738
25.2M
25.20 mi13:15:392:49:456:442:28
7:09
#3668
Finish
26.22 mi13:22:162:56:226:446:37
6:30
#3585
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi5080474247424884(Top 17%)4555(Top 28%)4555(Top 81%)
10K6.21 mi3.10 mi4539+5414265+4774265+4774084(Top 14%)3842(Top 24%)3842(Top 68%)
15K9.32 mi3.11 mi4617-784326-614326-614884(Top 17%)4555(Top 28%)4555(Top 81%)
20K12.43 mi3.11 mi4537+804249+774249+774488(Top 16%)4183(Top 26%)4183(Top 74%)
Half13.11 mi0.68 mi4548-114256-74256-74819(Top 17%)4479(Top 28%)4479(Top 79%)
25K15.53 mi2.42 mi4376+1724103+1534103+1533872(Top 14%)3627(Top 23%)3627(Top 64%)
30K18.64 mi3.11 mi4089+2873836+2673836+2673306(Top 12%)3094(Top 19%)3094(Top 55%)
20M20.00 mi1.36 mi4009+803756+803756+803405(Top 12%)3151(Top 20%)3151(Top 56%)
21M21.00 mi1.00 mi3877+1323637+1193637+1192627(Top 9%)2449(Top 15%)2449(Top 43%)
35K21.75 mi0.75 mi3827+503591+463591+462958(Top 10%)2730(Top 17%)2730(Top 48%)
23M23.00 mi1.25 mi3778+493536+553536+553543(Top 12%)3213(Top 20%)3213(Top 57%)
24M24.00 mi1.00 mi3727+513482+543482+543152(Top 11%)2848(Top 18%)2848(Top 50%)
40K24.85 mi0.85 mi3738-113487-53487-54783(Top 17%)4061(Top 25%)4061(Top 72%)
25.2M25.20 mi0.35 mi3668+703422+653422+652019(Top 7%)1832(Top 11%)1832(Top 32%)
Finish26.22 mi1.02 mi3585+833342+803342+802802(Top 10%)2509(Top 16%)2509(Top 44%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 17%
×21stories
+97ft-345ft

Overall

4884

Males

4555

M18-39

4555

5K→10K

3.1 - 6.2 mi

Top 14%
×5stories
+79ft-138ft

Overall

4084

Males

3842

M18-39

3842

10K→15K

6.2 - 9.3 mi

Top 17%
×3stories
+67ft-78ft

Overall

4884

Males

4555

M18-39

4555

15K→20K

9.3 - 12.4 mi

Top 16%
×5stories
+106ft-86ft

Overall

4488

Males

4183

M18-39

4183

20K→Half

12.4 - 13.1 mi

Top 17%
×2stories
+19ft-37ft

Overall

4819

Males

4479

M18-39

4479

Half→25K

13.1 - 15.5 mi

Top 14%
×4stories
+66ft-88ft

Overall

3872

Males

3627

M18-39

3627

25K→30K

15.5 - 18.6 mi

Top 12%
×9stories
+181ft-148ft

Overall

3306

Males

3094

M18-39

3094

30K→20M

18.6 - 20.0 mi

Top 12%
×5stories
+64ft-50ft

Overall

3405

Males

3151

M18-39

3151

20M→21M

20.0 - 21.0 mi

Top 9%
×8stories
+106ft-24ft

Overall

2627

Males

2449

M18-39

2449

21M→35K

21.0 - 21.8 mi

Top 10%
×7stories
+17ft-86ft

Overall

2958

Males

2730

M18-39

2730

35K→23M

21.8 - 23.0 mi

Top 12%
×5stories
+23ft-63ft

Overall

3543

Males

3213

M18-39

3213

23M→24M

23.0 - 24.0 mi

Top 11%
×6stories
+12ft-82ft

Overall

3152

Males

2848

M18-39

2848

24M→40K

24.0 - 24.9 mi

Top 17%
×1story
+6ft-20ft

Overall

4783

Males

4061

M18-39

4061

40K→25.2M

24.9 - 25.2 mi

Top 7%
×1story
+13ft-16ft

Overall

2019

Males

1832

M18-39

1832

25.2M→Finish

25.2 - 26.2 mi

Top 10%
×2stories
+22ft-21ft

Overall

2802

Males

2509

M18-39

2509

Passing Analysis

Category:
Athletes Passed
1970
Passed By
475
Net Change
+1495
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#5080
5K → 10K55716+541#5080#4539
10K → 15K77155-78#4539#4617
15K → 20K14868+80#4617#4537
20K → Half1021-11#4537#4548
Half → 25K19624+172#4548#4376
25K → 30K31326+287#4376#4089
30K → 20M9919+80#4089#4009
20M → 21M14210+132#4009#3877
21M → 35K577+50#3877#3827
35K → 23M9344+49#3827#3778
23M → 24M6918+51#3778#3727
24M → 40K4152-11#3727#3738
40K → 25.2M733+70#3738#3668
25.2M → Finish9512+83#3668#3585
TOTALS1970475+1495
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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