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BOSTON MARATHON 2025

Dennis Mcduffie

Bib: 1621•M

MA

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 6%
Gender (Male)
#0 / 16105
Top 10%
Division (M18-39)
#0 / 5642
Top 23%
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
5:57/mi
18:29
↑ 97↓ 3451.5%
10K· 6.21 mi
5:53/mi
36:45
↑ 79↓ 1380.4%
15K· 9.32 mi
5:59/mi
55:21
↑ 67↓ 78
20K· 12.43 mi
6:08/mi
1:14:25
↑ 106↓ 860.1%
Half· 13.11 mi
6:08/mi
1:18:36
↑ 19↓ 370.5%
25K· 15.53 mi
6:14/mi
1:33:42
↑ 66↓ 880.2%
30K· 18.64 mi
6:32/mi
1:53:59
↑ 181↓ 1480.2%
20M
6:42/mi
2:03:05
↑ 64↓ 500.2%
21M
7:15/mi
2:10:20
↑ 106↓ 241.6%
35K· 21.75 mi
6:45/mi
2:15:23
↑ 17↓ 861.7%
23M
6:59/mi
2:24:08
↑ 23↓ 630.6%
24M
6:58/mi
2:31:06
↓ 821.3%
40K· 24.85 mi
6:56/mi
2:37:02
↓ 200.3%
25.2M
7:32/mi
2:39:38
↑ 13↓ 160.2%
Finish· 26.22 mi
6:47/mi
2:46:33
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:18:36
Pace6:00 /mi
2nd Half
Distance13.11 mi
Time1:27:57
Pace6:43 /mi
📊Positive Split: 11.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:19:0518:295:5718:29
5:57
-
10K
6.21 mi10:37:2136:455:5518:16
5:53
-0:04
15K
9.32 mi10:55:5755:215:5618:36
5:59
+0:06
20K
12.43 mi11:15:011:14:255:5919:04
6:08
+0:09
Half
13.11 mi11:19:121:18:366:004:11
6:08
0:00
25K
15.53 mi11:34:181:33:426:0215:06
6:14
+0:06
30K
18.64 mi11:54:351:53:596:0720:17
6:32
+0:18
20M
20.00 mi12:03:412:03:056:099:06
6:42
+0:10
21M
21.00 mi12:10:562:10:206:127:15
7:15
+0:33
35K
21.75 mi12:15:592:15:236:145:03
6:45
-0:30
23M
23.00 mi12:24:442:24:086:168:45
6:59
+0:14
24M
24.00 mi12:31:422:31:066:186:58
6:58
-0:01
40K
24.85 mi12:37:382:37:026:195:56
6:56
-0:02
25.2M
25.20 mi12:40:142:39:386:202:36
7:32
+0:36
Finish
26.22 mi12:47:092:46:336:216:55
6:47
-0:45

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

5:53 /mi

Average Pace

6:21 /mi

Slowest Pace

7:32 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:33:42

56% of race

Time at Steady Pace

47:17

28% of race

Time at Slower Pace

25:34

15% of race

Average Pace: 6:21 /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 mi10:19:0518:295:5718:29
5:57
#936
10K
6.21 mi10:37:2136:455:5518:16
5:53
#850
15K
9.32 mi10:55:5755:215:5618:36
5:59
#894
20K
12.43 mi11:15:011:14:255:5919:04
6:08
#965
Half
13.11 mi11:19:121:18:366:004:11
6:08
#990
25K
15.53 mi11:34:181:33:426:0215:06
6:14
#1037
30K
18.64 mi11:54:351:53:596:0720:17
6:32
#1173
20M
20.00 mi12:03:412:03:056:099:06
6:42
#1245
21M
21.00 mi12:10:562:10:206:127:15
7:15
#1295
35K
21.75 mi12:15:592:15:236:145:03
6:45
#1341
23M
23.00 mi12:24:442:24:086:168:45
6:59
#1409
24M
24.00 mi12:31:422:31:066:186:58
6:58
#1493
40K
24.85 mi12:37:382:37:026:195:56
6:56
#1529
25.2M
25.20 mi12:40:142:39:386:202:36
7:32
#1551
Finish
26.22 mi12:47:092:46:336:216:55
6:47
#1624
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi9368788781000(Top 4%)947(Top 6%)947(Top 17%)
10K6.21 mi3.10 mi850+86797+81797+81783(Top 3%)733(Top 5%)733(Top 13%)
15K9.32 mi3.11 mi894-44840-43840-431000(Top 4%)947(Top 6%)947(Top 17%)
20K12.43 mi3.11 mi965-71909-69909-691317(Top 5%)1247(Top 8%)1247(Top 22%)
Half13.11 mi0.68 mi990-25933-24933-241680(Top 6%)1599(Top 10%)1599(Top 28%)
25K15.53 mi2.42 mi1037-47976-43976-431577(Top 6%)1498(Top 9%)1498(Top 27%)
30K18.64 mi3.11 mi1173-1361108-1321108-1322112(Top 7%)2005(Top 12%)2005(Top 36%)
20M20.00 mi1.36 mi1245-721175-671175-672452(Top 9%)2313(Top 14%)2313(Top 41%)
21M21.00 mi1.00 mi1295-501221-461221-463376(Top 12%)3098(Top 19%)3098(Top 55%)
35K21.75 mi0.75 mi1341-461265-441265-443816(Top 13%)3438(Top 21%)3438(Top 61%)
23M23.00 mi1.25 mi1409-681330-651330-653694(Top 13%)3338(Top 21%)3338(Top 59%)
24M24.00 mi1.00 mi1493-841412-821412-824436(Top 16%)3857(Top 24%)3857(Top 68%)
40K24.85 mi0.85 mi1529-361444-321444-323569(Top 13%)3165(Top 20%)3165(Top 56%)
25.2M25.20 mi0.35 mi1551-221467-231467-233575(Top 13%)3119(Top 19%)3119(Top 55%)
Finish26.22 mi1.02 mi1624-731537-701537-704422(Top 16%)3738(Top 23%)3738(Top 66%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 4%
×21story building
+97ft-345ft

Overall

1000

Males

947

M18-39

947

5K→10K

3.1 - 6.2 mi

Top 3%
×5story building
+79ft-138ft

Overall

783

Males

733

M18-39

733

10K→15K

6.2 - 9.3 mi

Top 4%
×3story building
+67ft-78ft

Overall

1000

Males

947

M18-39

947

15K→20K

9.3 - 12.4 mi

Top 5%
×5story building
+106ft-86ft

Overall

1317

Males

1247

M18-39

1247

20K→Half

12.4 - 13.1 mi

Top 6%
×2story building
+19ft-37ft

Overall

1680

Males

1599

M18-39

1599

Half→25K

13.1 - 15.5 mi

Top 6%
×4story building
+66ft-88ft

Overall

1577

Males

1498

M18-39

1498

25K→30K

15.5 - 18.6 mi

Top 7%
×9story building
+181ft-148ft

Overall

2112

Males

2005

M18-39

2005

30K→20M

18.6 - 20.0 mi

Top 9%
×5story building
+64ft-50ft

Overall

2452

Males

2313

M18-39

2313

20M→21M

20.0 - 21.0 mi

Top 12%
×8story building
+106ft-24ft

Overall

3376

Males

3098

M18-39

3098

21M→35K

21.0 - 21.8 mi

Top 13%
×7story building
+17ft-86ft

Overall

3816

Males

3438

M18-39

3438

35K→23M

21.8 - 23.0 mi

Top 13%
×5story building
+23ft-63ft

Overall

3694

Males

3338

M18-39

3338

23M→24M

23.0 - 24.0 mi

Top 16%
×6story building
+12ft-82ft

Overall

4436

Males

3857

M18-39

3857

24M→40K

24.0 - 24.9 mi

Top 13%
×1story
+6ft-20ft

Overall

3569

Males

3165

M18-39

3165

40K→25.2M

24.9 - 25.2 mi

Top 13%
×1story
+13ft-16ft

Overall

3575

Males

3119

M18-39

3119

25.2M→Finish

25.2 - 26.2 mi

Top 16%
×2story building
+22ft-21ft

Overall

4422

Males

3738

M18-39

3738

Passing Analysis

Category:
Athletes Passed
261
Passed By
949
Net Change
-688
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#936
5K → 10K10317+86#936#850
10K → 15K1155-44#850#894
15K → 20K1788-71#894#965
20K → Half126-25#965#990
Half → 25K1562-47#990#1037
25K → 30K22158-136#1037#1173
30K → 20M1385-72#1173#1245
20M → 21M1363-50#1245#1295
21M → 35K955-46#1295#1341
35K → 23M2088-68#1341#1409
23M → 24M1397-84#1409#1493
24M → 40K1349-36#1493#1529
40K → 25.2M527-22#1529#1551
25.2M → Finish679-73#1551#1624
TOTALS261949-688
📊

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