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BOSTON MARATHON 2025

Bob Kerwin

Bib: 28387•M

CT

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M50-54)
#0 / 1996
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
7:59/mi
24:48
↑ 97↓ 3451.5%
10K· 6.21 mi
7:51/mi
49:10
↑ 79↓ 1380.4%
15K· 9.32 mi
8:04/mi
1:14:13
↑ 67↓ 78
20K· 12.43 mi
8:21/mi
1:40:09
↑ 106↓ 860.1%
Half· 13.11 mi
8:21/mi
1:45:51
↑ 19↓ 370.5%
25K· 15.53 mi
8:37/mi
2:06:45
↑ 66↓ 880.2%
30K· 18.64 mi
9:02/mi
2:34:48
↑ 181↓ 1480.2%
20M
9:22/mi
2:47:32
↑ 64↓ 500.2%
21M
9:56/mi
2:57:28
↑ 106↓ 241.6%
35K· 21.75 mi
9:16/mi
3:04:24
↑ 17↓ 861.7%
23M
9:42/mi
3:16:33
↑ 23↓ 630.6%
24M
9:45/mi
3:26:18
↓ 821.3%
40K· 24.85 mi
10:04/mi
3:34:54
↓ 200.3%
25.2M
10:52/mi
3:38:39
↑ 13↓ 160.2%
Finish· 26.22 mi
9:24/mi
3:48:14
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:45:51
Pace8:04 /mi
2nd Half
Distance13.11 mi
Time2:02:23
Pace9:20 /mi
📊Positive Split: 15.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:41:4824:487:5924:48
7:59
-
10K
6.21 mi12:06:1049:107:5524:22
7:51
-0:08
15K
9.32 mi12:31:131:14:137:5825:03
8:04
+0:13
20K
12.43 mi12:57:091:40:098:0425:56
8:21
+0:17
Half
13.11 mi13:02:511:45:518:045:42
8:21
0:00
25K
15.53 mi13:23:452:06:458:1020:54
8:37
+0:16
30K
18.64 mi13:51:482:34:488:1828:03
9:02
+0:25
20M
20.00 mi14:04:322:47:328:2312:44
9:22
+0:20
21M
21.00 mi14:14:282:57:288:279:56
9:56
+0:34
35K
21.75 mi14:21:243:04:248:296:56
9:16
-0:40
23M
23.00 mi14:33:333:16:338:3312:09
9:42
+0:26
24M
24.00 mi14:43:183:26:188:369:45
9:45
+0:03
40K
24.85 mi14:51:543:34:548:398:36
10:04
+0:19
25.2M
25.20 mi14:55:393:38:398:413:45
10:52
+0:48
Finish
26.22 mi15:05:143:48:148:439:35
9:24
-1:28

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

7:51 /mi

Average Pace

8:43 /mi

Slowest Pace

10:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:06:45

56% of race

Time at Steady Pace

57:18

25% of race

Time at Slower Pace

44:11

19% of race

Average Pace: 8:42 /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 mi11:41:4824:487:5924:48
7:59
#16434
10K
6.21 mi12:06:1049:107:5524:22
7:51
#15804
15K
9.32 mi12:31:131:14:137:5825:03
8:04
#16028
20K
12.43 mi12:57:091:40:098:0425:56
8:21
#16377
Half
13.11 mi13:02:511:45:518:045:42
8:21
#16488
25K
15.53 mi13:23:452:06:458:1020:54
8:37
#16704
30K
18.64 mi13:51:482:34:488:1828:03
9:02
#16858
20M
20.00 mi14:04:322:47:328:2312:44
9:22
#16990
21M
21.00 mi14:14:282:57:288:279:56
9:56
#17018
35K
21.75 mi14:21:243:04:248:296:56
9:16
#17139
23M
23.00 mi14:33:333:16:338:3312:09
9:42
#17316
24M
24.00 mi14:43:183:26:188:369:45
9:45
#17509
40K
24.85 mi14:51:543:34:548:398:36
10:04
#17679
25.2M
25.20 mi14:55:393:38:398:413:45
10:52
#17728
Finish
26.22 mi15:05:143:48:148:439:35
9:24
#17902
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi16434109811098116497(Top 58%)11015(Top 68%)11015(Top 552%)
10K6.21 mi3.10 mi15804+63010738+24310738+24315196(Top 53%)10495(Top 65%)10495(Top 526%)
15K9.32 mi3.11 mi16028-22410821-8310821-8316497(Top 58%)11015(Top 68%)11015(Top 552%)
20K12.43 mi3.11 mi16377-34910961-14010961-14017200(Top 61%)11266(Top 70%)11266(Top 564%)
Half13.11 mi0.68 mi16488-11111008-4711008-4718254(Top 64%)11732(Top 73%)11732(Top 588%)
25K15.53 mi2.42 mi16704-21611069-6111069-6117912(Top 63%)11482(Top 71%)11482(Top 575%)
30K18.64 mi3.11 mi16858-15411079-1011079-1017823(Top 63%)11291(Top 70%)11291(Top 566%)
20M20.00 mi1.36 mi16990-13211105-2611105-2618602(Top 65%)11497(Top 71%)11497(Top 576%)
21M21.00 mi1.00 mi17018-2811082+2311082+2318028(Top 63%)11170(Top 69%)11170(Top 560%)
35K21.75 mi0.75 mi17139-12111105-2311105-2319429(Top 68%)11696(Top 73%)11696(Top 586%)
23M23.00 mi1.25 mi17316-17711146-4111146-4119445(Top 68%)11644(Top 72%)11644(Top 583%)
24M24.00 mi1.00 mi17509-19311208-6211208-6220544(Top 72%)12120(Top 75%)12120(Top 607%)
40K24.85 mi0.85 mi17679-17011251-4311251-4320624(Top 73%)12097(Top 75%)12097(Top 606%)
25.2M25.20 mi0.35 mi17728-4911269-1811269-1820215(Top 71%)11884(Top 74%)11884(Top 595%)
Finish26.22 mi1.02 mi17902-17411336-6711336-6720813(Top 73%)12193(Top 76%)12193(Top 611%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 58%
×21story building
+97ft-345ft

Overall

16497

Males

11015

M50-54

11015

5K→10K

3.1 - 6.2 mi

Top 53%
×5story building
+79ft-138ft

Overall

15196

Males

10495

M50-54

10495

10K→15K

6.2 - 9.3 mi

Top 58%
×3story building
+67ft-78ft

Overall

16497

Males

11015

M50-54

11015

15K→20K

9.3 - 12.4 mi

Top 61%
×5story building
+106ft-86ft

Overall

17200

Males

11266

M50-54

11266

20K→Half

12.4 - 13.1 mi

Top 64%
×2story building
+19ft-37ft

Overall

18254

Males

11732

M50-54

11732

Half→25K

13.1 - 15.5 mi

Top 63%
×4story building
+66ft-88ft

Overall

17912

Males

11482

M50-54

11482

25K→30K

15.5 - 18.6 mi

Top 63%
×9story building
+181ft-148ft

Overall

17823

Males

11291

M50-54

11291

30K→20M

18.6 - 20.0 mi

Top 65%
×5story building
+64ft-50ft

Overall

18602

Males

11497

M50-54

11497

20M→21M

20.0 - 21.0 mi

Top 63%
×8story building
+106ft-24ft

Overall

18028

Males

11170

M50-54

11170

21M→35K

21.0 - 21.8 mi

Top 68%
×7story building
+17ft-86ft

Overall

19429

Males

11696

M50-54

11696

35K→23M

21.8 - 23.0 mi

Top 68%
×5story building
+23ft-63ft

Overall

19445

Males

11644

M50-54

11644

23M→24M

23.0 - 24.0 mi

Top 72%
×6story building
+12ft-82ft

Overall

20544

Males

12120

M50-54

12120

24M→40K

24.0 - 24.9 mi

Top 73%
×1story
+6ft-20ft

Overall

20624

Males

12097

M50-54

12097

40K→25.2M

24.9 - 25.2 mi

Top 71%
×1story
+13ft-16ft

Overall

20215

Males

11884

M50-54

11884

25.2M→Finish

25.2 - 26.2 mi

Top 73%
×2story building
+22ft-21ft

Overall

20813

Males

12193

M50-54

12193

Passing Analysis

Category:
Athletes Passed
1628
Passed By
3096
Net Change
-1468
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16434
5K → 10K71888+630#16434#15804
10K → 15K141365-224#15804#16028
15K → 20K110459-349#16028#16377
20K → Half11122-111#16377#16488
Half → 25K96312-216#16488#16704
25K → 30K167321-154#16704#16858
30K → 20M60192-132#16858#16990
20M → 21M108136-28#16990#17018
21M → 35K41162-121#17018#17139
35K → 23M70247-177#17139#17316
23M → 24M37230-193#17316#17509
24M → 40K24194-170#17509#17679
40K → 25.2M2170-49#17679#17728
25.2M → Finish24198-174#17728#17902
TOTALS16283096-1468
📊

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