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BOSTON MARATHON 2025

Jonathan Slabaugh

Bib: 29537•M

IN

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M40-44)
#0 / 2247
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
8:58/mi
27:50
↑ 97↓ 3451.5%
10K· 6.21 mi
8:39/mi
54:41
↑ 79↓ 1380.4%
15K· 9.32 mi
8:38/mi
1:21:31
↑ 67↓ 78
20K· 12.43 mi
8:39/mi
1:48:25
↑ 106↓ 860.1%
Half· 13.11 mi
8:45/mi
1:54:23
↑ 19↓ 370.5%
25K· 15.53 mi
8:42/mi
2:15:28
↑ 66↓ 880.2%
30K· 18.64 mi
9:08/mi
2:43:50
↑ 181↓ 1480.2%
20M
9:07/mi
2:56:14
↑ 64↓ 500.2%
21M
9:36/mi
3:05:50
↑ 106↓ 241.6%
35K· 21.75 mi
8:52/mi
3:12:28
↑ 17↓ 861.7%
23M
9:05/mi
3:23:51
↑ 23↓ 630.6%
24M
9:02/mi
3:32:53
↓ 821.3%
40K· 24.85 mi
9:12/mi
3:40:45
↓ 200.3%
25.2M
9:57/mi
3:44:11
↑ 13↓ 160.2%
Finish· 26.22 mi
8:45/mi
3:53:06
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:23
Pace8:44 /mi
2nd Half
Distance13.11 mi
Time1:58:43
Pace9:03 /mi
📊Positive Split: 3.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:5327:508:5827:50
8:58
-
10K
6.21 mi12:13:4454:418:4826:51
8:39
-0:19
15K
9.32 mi12:40:341:21:318:4526:50
8:38
-0:01
20K
12.43 mi13:07:281:48:258:4326:54
8:39
+0:01
Half
13.11 mi13:13:261:54:238:445:58
8:45
+0:06
25K
15.53 mi13:34:312:15:288:4321:05
8:42
-0:03
30K
18.64 mi14:02:532:43:508:4728:22
9:08
+0:26
20M
20.00 mi14:15:172:56:148:4912:24
9:07
-0:01
21M
21.00 mi14:24:533:05:508:519:36
9:36
+0:29
35K
21.75 mi14:31:313:12:288:516:38
8:52
-0:44
23M
23.00 mi14:42:543:23:518:5211:23
9:05
+0:13
24M
24.00 mi14:51:563:32:538:529:02
9:02
-0:03
40K
24.85 mi14:59:483:40:458:537:52
9:12
+0:10
25.2M
25.20 mi15:03:143:44:118:543:26
9:57
+0:45
Finish
26.22 mi15:12:093:53:068:548:55
8:45
-1:12

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

8:38 /mi

Average Pace

8:54 /mi

Slowest Pace

9:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:40:04

94% of race

Time at Steady Pace

13:02

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:53 /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 mi11:46:5327:508:5827:50
8:58
#22234
10K
6.21 mi12:13:4454:418:4826:51
8:39
#21446
15K
9.32 mi12:40:341:21:318:4526:50
8:38
#20977
20K
12.43 mi13:07:281:48:258:4326:54
8:39
#20548
Half
13.11 mi13:13:261:54:238:445:58
8:45
#20549
25K
15.53 mi13:34:312:15:288:4321:05
8:42
#20177
30K
18.64 mi14:02:532:43:508:4728:22
9:08
#19809
20M
20.00 mi14:15:172:56:148:4912:24
9:07
#19620
21M
21.00 mi14:24:533:05:508:519:36
9:36
#19430
35K
21.75 mi14:31:313:12:288:516:38
8:52
#19369
23M
23.00 mi14:42:543:23:518:5211:23
9:05
#19207
24M
24.00 mi14:51:563:32:538:529:02
9:02
#19141
40K
24.85 mi14:59:483:40:458:537:52
9:12
#19055
25.2M
25.20 mi15:03:143:44:118:543:26
9:57
#19018
Finish
26.22 mi15:12:093:53:068:548:55
8:45
#18962
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi22234134121341220120(Top 71%)12566(Top 78%)12566(Top 559%)
10K6.21 mi3.10 mi21446+78813079+33313079+33320556(Top 72%)12722(Top 79%)12722(Top 566%)
15K9.32 mi3.11 mi20977+46912888+19112888+19120120(Top 71%)12566(Top 78%)12566(Top 559%)
20K12.43 mi3.11 mi20548+42912703+18512703+18519186(Top 68%)12116(Top 75%)12116(Top 539%)
Half13.11 mi0.68 mi20549-112706-312706-320582(Top 72%)12708(Top 79%)12708(Top 566%)
25K15.53 mi2.42 mi20177+37212531+17512531+17518353(Top 65%)11679(Top 73%)11679(Top 520%)
30K18.64 mi3.11 mi19809+36812345+18612345+18618309(Top 64%)11513(Top 71%)11513(Top 512%)
20M20.00 mi1.36 mi19620+18912234+11112234+11117425(Top 61%)10999(Top 68%)10999(Top 489%)
21M21.00 mi1.00 mi19430+19012125+10912125+10916541(Top 58%)10500(Top 65%)10500(Top 467%)
35K21.75 mi0.75 mi19369+6112082+4312082+4317586(Top 62%)10864(Top 67%)10864(Top 483%)
23M23.00 mi1.25 mi19207+16211985+9711985+9716765(Top 59%)10414(Top 65%)10414(Top 463%)
24M24.00 mi1.00 mi19141+6611938+4711938+4717529(Top 62%)10711(Top 67%)10711(Top 477%)
40K24.85 mi0.85 mi19055+8611877+6111877+6117337(Top 61%)10530(Top 65%)10530(Top 469%)
25.2M25.20 mi0.35 mi19018+3711847+3011847+3016802(Top 59%)10285(Top 64%)10285(Top 458%)
Finish26.22 mi1.02 mi18962+5611802+4511802+4517766(Top 63%)10761(Top 67%)10761(Top 479%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 71%
×21story building
+97ft-345ft

Overall

20120

Males

12566

M40-44

12566

5K→10K

3.1 - 6.2 mi

Top 72%
×5story building
+79ft-138ft

Overall

20556

Males

12722

M40-44

12722

10K→15K

6.2 - 9.3 mi

Top 71%
×3story building
+67ft-78ft

Overall

20120

Males

12566

M40-44

12566

15K→20K

9.3 - 12.4 mi

Top 68%
×5story building
+106ft-86ft

Overall

19186

Males

12116

M40-44

12116

20K→Half

12.4 - 13.1 mi

Top 72%
×2story building
+19ft-37ft

Overall

20582

Males

12708

M40-44

12708

Half→25K

13.1 - 15.5 mi

Top 65%
×4story building
+66ft-88ft

Overall

18353

Males

11679

M40-44

11679

25K→30K

15.5 - 18.6 mi

Top 64%
×9story building
+181ft-148ft

Overall

18309

Males

11513

M40-44

11513

30K→20M

18.6 - 20.0 mi

Top 61%
×5story building
+64ft-50ft

Overall

17425

Males

10999

M40-44

10999

20M→21M

20.0 - 21.0 mi

Top 58%
×8story building
+106ft-24ft

Overall

16541

Males

10500

M40-44

10500

21M→35K

21.0 - 21.8 mi

Top 62%
×7story building
+17ft-86ft

Overall

17586

Males

10864

M40-44

10864

35K→23M

21.8 - 23.0 mi

Top 59%
×5story building
+23ft-63ft

Overall

16765

Males

10414

M40-44

10414

23M→24M

23.0 - 24.0 mi

Top 62%
×6story building
+12ft-82ft

Overall

17529

Males

10711

M40-44

10711

24M→40K

24.0 - 24.9 mi

Top 61%
×1story
+6ft-20ft

Overall

17337

Males

10530

M40-44

10530

40K→25.2M

24.9 - 25.2 mi

Top 59%
×1story
+13ft-16ft

Overall

16802

Males

10285

M40-44

10285

25.2M→Finish

25.2 - 26.2 mi

Top 63%
×2story building
+22ft-21ft

Overall

17766

Males

10761

M40-44

10761

Passing Analysis

Category:
Athletes Passed
3643
Passed By
371
Net Change
+3272
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22234
5K → 10K83547+788#22234#21446
10K → 15K50738+469#21446#20977
15K → 20K44516+429#20977#20548
20K → Half3940-1#20548#20549
Half → 25K38412+372#20549#20177
25K → 30K42456+368#20177#19809
30K → 20M20920+189#19809#19620
20M → 21M20414+190#19620#19430
21M → 35K7716+61#19430#19369
35K → 23M18321+162#19369#19207
23M → 24M9327+66#19207#19141
24M → 40K10923+86#19141#19055
40K → 25.2M5720+37#19055#19018
25.2M → Finish7721+56#19018#18962
TOTALS3643371+3272
📊

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