Boston Marathon logo
BOSTON MARATHON 2025

Nathan Musolff

Bib: 4348•M

UT

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 15%
Gender (Male)
#0 / 16105
Top 25%
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:04
Rank: #1563
Start → 5K
19:04 | 6:08/mi
10K· 6.21 mi
38:35
Rank: #1929 (-366)
5K → 10K
19:31 | 6:17/mi
15K· 9.32 mi
58:41
Rank: #2351 (-422)
10K → 15K
20:06 | 6:28/mi
20K· 12.43 mi
1:19:35
Rank: #2878 (-527)
15K → 20K
20:54 | 6:44/mi
Half· 13.11 mi
1:24:09
Rank: #2986 (-108)
20K → Half
4:34 | 6:42/mi
25K· 15.53 mi
1:40:58
Rank: #3377 (-391)
Half → 25K
16:49 | 6:56/mi
30K· 18.64 mi
2:02:50
Rank: #3601 (-224)
25K → 30K
21:52 | 7:02/mi
20M
2:12:32
Rank: #3630 (-29)
30K → 20M
9:42 | 7:08/mi
21M
2:20:05
Rank: #3677 (-47)
20M → 21M
7:33 | 7:33/mi
35K· 21.75 mi
2:25:18
Rank: #3708 (-31)
21M → 35K
5:13 | 6:58/mi
23M
2:34:30
Rank: #3796 (-88)
35K → 23M
9:12 | 7:21/mi
24M
2:41:52
Rank: #3922 (-126)
23M → 24M
7:22 | 7:22/mi
40K· 24.85 mi
2:48:26
Rank: #4054 (-132)
24M → 40K
6:34 | 7:41/mi
25.2M
2:51:23
Rank: #4135 (-81)
40K → 25.2M
2:57 | 8:33/mi
Finish· 26.22 mi
2:59:05
Rank: #4383 (-248)
25.2M → Finish
7:42 | 7:33/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:24:09
Pace6:25 /mi
2nd Half
Distance13.11 mi
Time1:34:56
Pace7:15 /mi
📊Positive Split: 12.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:21:5119:046:0819:04
6:08
-
10K
6.21 mi10:41:2238:356:1319:31
6:17
+0:09
15K
9.32 mi11:01:2858:416:1820:06
6:28
+0:11
20K
12.43 mi11:22:221:19:356:2420:54
6:44
+0:16
Half
13.11 mi11:26:561:24:096:254:34
6:42
-0:02
25K
15.53 mi11:43:451:40:586:3016:49
6:56
+0:14
30K
18.64 mi12:05:372:02:506:3521:52
7:02
+0:06
20M
20.00 mi12:15:192:12:326:389:42
7:08
+0:06
21M
21.00 mi12:22:522:20:056:407:33
7:33
+0:25
35K
21.75 mi12:28:052:25:186:415:13
6:58
-0:35
23M
23.00 mi12:37:172:34:306:439:12
7:21
+0:23
24M
24.00 mi12:44:392:41:526:457:22
7:22
+0:01
40K
24.85 mi12:51:132:48:266:476:34
7:41
+0:19
25.2M
25.20 mi12:54:102:51:236:482:57
8:33
+0:52
Finish
26.22 mi13:01:522:59:056:507:42
7:33
-1:00

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

6:08 /mi

Average Pace

6:50 /mi

Slowest Pace

8:33 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:24:09

47% of race

Time at Steady Pace

53:36

30% of race

Time at Slower Pace

41:20

23% of race

Average Pace: 6:50 /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 mi10:21:5119:046:0819:04
6:08
#1563
10K
6.21 mi10:41:2238:356:1319:31
6:17
#1929
15K
9.32 mi11:01:2858:416:1820:06
6:28
#2351
20K
12.43 mi11:22:221:19:356:2420:54
6:44
#2878
Half
13.11 mi11:26:561:24:096:254:34
6:42
#2986
25K
15.53 mi11:43:451:40:586:3016:49
6:56
#3377
30K
18.64 mi12:05:372:02:506:3521:52
7:02
#3601
20M
20.00 mi12:15:192:12:326:389:42
7:08
#3630
21M
21.00 mi12:22:522:20:056:407:33
7:33
#3677
35K
21.75 mi12:28:052:25:186:415:13
6:58
#3708
23M
23.00 mi12:37:172:34:306:439:12
7:21
#3796
24M
24.00 mi12:44:392:41:526:457:22
7:22
#3922
40K
24.85 mi12:51:132:48:266:476:34
7:41
#4054
25.2M
25.20 mi12:54:102:51:236:482:57
8:33
#4135
Finish
26.22 mi13:01:522:59:056:507:42
7:33
#4383
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi1563148814883385(Top 12%)3212(Top 20%)3212(Top 57%)
10K6.21 mi3.10 mi1929-3661837-3491837-3492314(Top 8%)2215(Top 14%)2215(Top 39%)
15K9.32 mi3.11 mi2351-4222246-4092246-4093385(Top 12%)3212(Top 20%)3212(Top 57%)
20K12.43 mi3.11 mi2878-5272745-4992745-4994682(Top 16%)4344(Top 27%)4344(Top 77%)
Half13.11 mi0.68 mi2986-1082847-1022847-1025230(Top 18%)4825(Top 30%)4825(Top 86%)
25K15.53 mi2.42 mi3377-3913209-3623209-3625889(Top 21%)5308(Top 33%)5308(Top 94%)
30K18.64 mi3.11 mi3601-2243401-1923401-1924932(Top 17%)4480(Top 28%)4480(Top 79%)
20M20.00 mi1.36 mi3630-293425-243425-244878(Top 17%)4393(Top 27%)4393(Top 78%)
21M21.00 mi1.00 mi3677-473459-343459-344870(Top 17%)4280(Top 27%)4280(Top 76%)
35K21.75 mi0.75 mi3708-313485-263485-265177(Top 18%)4509(Top 28%)4509(Top 80%)
23M23.00 mi1.25 mi3796-883552-673552-675722(Top 20%)4809(Top 30%)4809(Top 85%)
24M24.00 mi1.00 mi3922-1263650-983650-986806(Top 24%)5405(Top 34%)5405(Top 96%)
40K24.85 mi0.85 mi4054-1323759-1093759-1097922(Top 28%)5942(Top 37%)5942(Top 105%)
25.2M25.20 mi0.35 mi4135-813819-603819-609011(Top 32%)6430(Top 40%)6430(Top 114%)
Finish26.22 mi1.02 mi4383-2484025-2064025-2069562(Top 34%)6734(Top 42%)6734(Top 119%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 12%
×21stories
+97ft-345ft

Overall

3385

Males

3212

M18-39

3212

5K→10K

3.1 - 6.2 mi

Top 8%
×5stories
+79ft-138ft

Overall

2314

Males

2215

M18-39

2215

10K→15K

6.2 - 9.3 mi

Top 12%
×3stories
+67ft-78ft

Overall

3385

Males

3212

M18-39

3212

15K→20K

9.3 - 12.4 mi

Top 16%
×5stories
+106ft-86ft

Overall

4682

Males

4344

M18-39

4344

20K→Half

12.4 - 13.1 mi

Top 18%
×2stories
+19ft-37ft

Overall

5230

Males

4825

M18-39

4825

Half→25K

13.1 - 15.5 mi

Top 21%
×4stories
+66ft-88ft

Overall

5889

Males

5308

M18-39

5308

25K→30K

15.5 - 18.6 mi

Top 17%
×9stories
+181ft-148ft

Overall

4932

Males

4480

M18-39

4480

30K→20M

18.6 - 20.0 mi

Top 17%
×5stories
+64ft-50ft

Overall

4878

Males

4393

M18-39

4393

20M→21M

20.0 - 21.0 mi

Top 17%
×8stories
+106ft-24ft

Overall

4870

Males

4280

M18-39

4280

21M→35K

21.0 - 21.8 mi

Top 18%
×7stories
+17ft-86ft

Overall

5177

Males

4509

M18-39

4509

35K→23M

21.8 - 23.0 mi

Top 20%
×5stories
+23ft-63ft

Overall

5722

Males

4809

M18-39

4809

23M→24M

23.0 - 24.0 mi

Top 24%
×6stories
+12ft-82ft

Overall

6806

Males

5405

M18-39

5405

24M→40K

24.0 - 24.9 mi

Top 28%
×1story
+6ft-20ft

Overall

7922

Males

5942

M18-39

5942

40K→25.2M

24.9 - 25.2 mi

Top 32%
×1story
+13ft-16ft

Overall

9011

Males

6430

M18-39

6430

25.2M→Finish

25.2 - 26.2 mi

Top 34%
×2stories
+22ft-21ft

Overall

9562

Males

6734

M18-39

6734

Passing Analysis

Category:
Athletes Passed
307
Passed By
3127
Net Change
-2820
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1563
5K → 10K12378-366#1563#1929
10K → 15K10432-422#1929#2351
15K → 20K8535-527#2351#2878
20K → Half2110-108#2878#2986
Half → 25K13404-391#2986#3377
25K → 30K62286-224#3377#3601
30K → 20M5079-29#3601#3630
20M → 21M3178-47#3630#3677
21M → 35K2657-31#3677#3708
35K → 23M42130-88#3708#3796
23M → 24M23149-126#3796#3922
24M → 40K19151-132#3922#4054
40K → 25.2M586-81#4054#4135
25.2M → Finish4252-248#4135#4383
TOTALS3073127-2820
📊

Passing Visuals

Category:

📈Position Graph

Loading...

🎨Heatmap Timeline

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing