Boston Marathon logo
BOSTON MARATHON 2025

Zac Coulson

Bib: 2090•M

OK

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Gender (Male)
#0 / 16105
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
19:05
Rank: #1583
Start → 5K
19:05 | 6:09/mi
10K· 6.21 mi
38:25
Rank: #1789 (-206)
5K → 10K
19:20 | 6:13/mi
15K· 9.32 mi
57:49
Rank: #1868 (-79)
10K → 15K
19:24 | 6:15/mi
20K· 12.43 mi
1:17:39
Rank: #1987 (-119)
15K → 20K
19:50 | 6:23/mi
Half· 13.11 mi
1:22:07
Rank: #2086 (-99)
20K → Half
4:28 | 6:33/mi
25K· 15.53 mi
1:38:36
Rank: #2442 (-356)
Half → 25K
16:29 | 6:48/mi
30K· 18.64 mi
2:19:03
Rank: #10233 (-7791)
25K → 30K
40:27 | 13:01/mi
20M
3:11:02
Rank: #22717 (-12484)
30K → 20M
51:59 | 38:15/mi
21M
3:27:17
Rank: #23337 (-620)
20M → 21M
16:15 | 16:15/mi
35K· 21.75 mi
3:39:15
Rank: #23870 (-533)
21M → 35K
11:58 | 16:00/mi
23M
3:59:18
Rank: #24500 (-630)
35K → 23M
20:03 | 16:01/mi
24M
4:14:43
Rank: #24836 (-336)
23M → 24M
15:25 | 15:25/mi
40K· 24.85 mi
4:27:49
Rank: #25066 (-230)
24M → 40K
13:06 | 15:19/mi
25.2M
4:32:28
Rank: #25078 (-12)
40K → 25.2M
4:39 | 13:29/mi
Finish· 26.22 mi
4:43:51
Rank: #25106 (-28)
25.2M → Finish
11:23 | 11:10/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
Time1:22:07
Pace6:16 /mi
2nd Half
Distance13.11 mi
Time3:21:44
Pace15:23 /mi
📊Positive Split: 145.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:19:3519:056:0919:05
6:09
-
10K
6.21 mi10:38:5538:256:1119:20
6:13
+0:04
15K
9.32 mi10:58:1957:496:1219:24
6:15
+0:02
20K
12.43 mi11:18:091:17:396:1519:50
6:23
+0:08
Half
13.11 mi11:22:371:22:076:164:28
6:33
+0:10
25K
15.53 mi11:39:061:38:366:2116:29
6:48
+0:15
30K
18.64 mi12:19:332:19:037:2840:27
13:01
+6:13
20M
20.00 mi13:11:323:11:029:3351:59
38:15
+25:14
21M
21.00 mi13:27:473:27:179:5216:15
16:15
-22:00
35K
21.75 mi13:39:453:39:1510:0511:58
16:00
-0:15
23M
23.00 mi13:59:483:59:1810:2420:03
16:01
+0:01
24M
24.00 mi14:15:134:14:4310:3715:25
15:25
-0:36
40K
24.85 mi14:28:194:27:4910:4713:06
15:19
-0:06
25.2M
25.20 mi14:32:584:32:2810:494:39
13:29
-1:50
Finish
26.22 mi14:44:214:43:5110:5011:23
11:10
-2:19

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

6:09 /mi

Average Pace

10:50 /mi

Slowest Pace

38:15 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:38:36

35% of race

Time at Steady Pace

2:13:16

47% of race

Time at Slower Pace

51:59

18% of race

Average Pace: 10:50 /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 mi10:19:3519:056:0919:05
6:09
#1583
10K
6.21 mi10:38:5538:256:1119:20
6:13
#1789
15K
9.32 mi10:58:1957:496:1219:24
6:15
#1868
20K
12.43 mi11:18:091:17:396:1519:50
6:23
#1987
Half
13.11 mi11:22:371:22:076:164:28
6:33
#2086
25K
15.53 mi11:39:061:38:366:2116:29
6:48
#2442
30K
18.64 mi12:19:332:19:037:2840:27
13:01
#10233
20M
20.00 mi13:11:323:11:029:3351:59
38:15
#22717
21M
21.00 mi13:27:473:27:179:5216:15
16:15
#23337
35K
21.75 mi13:39:453:39:1510:0511:58
16:00
#23870
23M
23.00 mi13:59:483:59:1810:2420:03
16:01
#24500
24M
24.00 mi14:15:134:14:4310:3715:25
15:25
#24836
40K
24.85 mi14:28:194:27:4910:4713:06
15:19
#25066
25.2M
25.20 mi14:32:584:32:2810:494:39
13:29
#25078
Finish
26.22 mi14:44:214:43:5110:5011:23
11:10
#25106
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi1583150815082074(Top 7%)1978(Top 12%)1978(Top 35%)
10K6.21 mi3.10 mi1789-2061701-1931701-1932032(Top 7%)1936(Top 12%)1936(Top 34%)
15K9.32 mi3.11 mi1868-791778-771778-772074(Top 7%)1978(Top 12%)1978(Top 35%)
20K12.43 mi3.11 mi1987-1191897-1191897-1192449(Top 9%)2337(Top 15%)2337(Top 41%)
Half13.11 mi0.68 mi2086-991991-941991-944069(Top 14%)3833(Top 24%)3833(Top 68%)
25K15.53 mi2.42 mi2442-3562331-3402331-3404881(Top 17%)4489(Top 28%)4489(Top 80%)
30K18.64 mi3.11 mi10233-77918133-58028133-580226701(Top 94%)15297(Top 95%)15297(Top 271%)
20M20.00 mi1.36 mi22717-1248413601-546813601-546828403(Top 100%)16105(Top 100%)16105(Top 285%)
21M21.00 mi1.00 mi23337-62013866-26513866-26527917(Top 98%)15831(Top 98%)15831(Top 281%)
35K21.75 mi0.75 mi23870-53314100-23414100-23428239(Top 99%)15997(Top 99%)15997(Top 284%)
23M23.00 mi1.25 mi24500-63014375-27514375-27528152(Top 99%)15936(Top 99%)15936(Top 282%)
24M24.00 mi1.00 mi24836-33614518-14314518-14328134(Top 99%)15916(Top 99%)15916(Top 282%)
40K24.85 mi0.85 mi25066-23014618-10014618-10027903(Top 98%)15775(Top 98%)15775(Top 280%)
25.2M25.20 mi0.35 mi25078-1214623-514623-525653(Top 90%)14567(Top 90%)14567(Top 258%)
Finish26.22 mi1.02 mi25106-2814626-314626-325660(Top 90%)14606(Top 91%)14606(Top 259%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 7%
×21stories
+97ft-345ft

Overall

2074

Males

1978

M18-39

1978

5K→10K

3.1 - 6.2 mi

Top 7%
×5stories
+79ft-138ft

Overall

2032

Males

1936

M18-39

1936

10K→15K

6.2 - 9.3 mi

Top 7%
×3stories
+67ft-78ft

Overall

2074

Males

1978

M18-39

1978

15K→20K

9.3 - 12.4 mi

Top 9%
×5stories
+106ft-86ft

Overall

2449

Males

2337

M18-39

2337

20K→Half

12.4 - 13.1 mi

Top 14%
×2stories
+19ft-37ft

Overall

4069

Males

3833

M18-39

3833

Half→25K

13.1 - 15.5 mi

Top 17%
×4stories
+66ft-88ft

Overall

4881

Males

4489

M18-39

4489

25K→30K

15.5 - 18.6 mi

Top 94%
×9stories
+181ft-148ft

Overall

26701

Males

15297

M18-39

15297

30K→20M

18.6 - 20.0 mi

Top 100%
×5stories
+64ft-50ft

Overall

28403

Males

16105

M18-39

16105

20M→21M

20.0 - 21.0 mi

Top 98%
×8stories
+106ft-24ft

Overall

27917

Males

15831

M18-39

15831

21M→35K

21.0 - 21.8 mi

Top 99%
×7stories
+17ft-86ft

Overall

28239

Males

15997

M18-39

15997

35K→23M

21.8 - 23.0 mi

Top 99%
×5stories
+23ft-63ft

Overall

28152

Males

15936

M18-39

15936

23M→24M

23.0 - 24.0 mi

Top 99%
×6stories
+12ft-82ft

Overall

28134

Males

15916

M18-39

15916

24M→40K

24.0 - 24.9 mi

Top 98%
×1story
+6ft-20ft

Overall

27903

Males

15775

M18-39

15775

40K→25.2M

24.9 - 25.2 mi

Top 90%
×1story
+13ft-16ft

Overall

25653

Males

14567

M18-39

14567

25.2M→Finish

25.2 - 26.2 mi

Top 90%
×2stories
+22ft-21ft

Overall

25660

Males

14606

M18-39

14606

Passing Analysis

Category:
Athletes Passed
143
Passed By
23664
Net Change
-23523
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1583
5K → 10K27233-206#1583#1789
10K → 15K26105-79#1789#1868
15K → 20K36155-119#1868#1987
20K → Half099-99#1987#2086
Half → 25K8364-356#2086#2442
25K → 30K07789-7791#2442#10233
30K → 20M012484-12484#10233#22717
20M → 21M5625-620#22717#23337
21M → 35K3536-533#23337#23870
35K → 23M5635-630#23870#24500
23M → 24M1337-336#24500#24836
24M → 40K6236-230#24836#25066
40K → 25.2M1123-12#25066#25078
25.2M → Finish1543-28#25078#25106
TOTALS14323664-23523
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

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