Boston Marathon logo
BOSTON MARATHON 2023

Colin Casey

Bib: 26014•M

MA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Division (M18-39)
#0 / 5285
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
29:49
Rank: #22366
Start → 5K
29:49 | 9:36/mi
10K· 6.21 mi
57:14
Rank: #21436 (+930)
5K → 10K
27:25 | 8:49/mi
15K· 9.32 mi
1:24:51
Rank: #21040 (+396)
10K → 15K
27:37 | 8:53/mi
20K· 12.43 mi
1:56:15
Rank: #21683 (-643)
15K → 20K
31:24 | 10:06/mi
Half· 13.11 mi
2:03:56
Rank: #21951 (-268)
20K → Half
7:41 | 11:16/mi
25K· 15.53 mi
2:38:43
Rank: #23632 (-1681)
Half → 25K
34:47 | 14:21/mi
30K· 18.64 mi
3:24:12
Rank: #24593 (-961)
25K → 30K
45:29 | 14:38/mi
20M
3:42:15
Rank: #24708 (-115)
30K → 20M
18:03 | 13:17/mi
21M
3:57:17
Rank: #24816 (-108)
20M → 21M
15:02 | 15:02/mi
35K· 21.75 mi
4:07:20
Rank: #24897 (-81)
21M → 35K
10:03 | 13:26/mi
23M
4:24:42
Rank: #25003 (-106)
35K → 23M
17:22 | 13:52/mi
24M
4:36:59
Rank: #25013 (-10)
23M → 24M
12:17 | 12:17/mi
40K· 24.85 mi
4:48:15
Rank: #25038 (-25)
24M → 40K
11:16 | 13:11/mi
25.2M
4:52:49
Rank: #25027 (+11)
40K → 25.2M
4:34 | 13:15/mi
Finish· 26.22 mi
5:05:25
Rank: #25060 (-33)
25.2M → Finish
12:36 | 12:22/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
Time2:03:56
Pace9:27 /mi
2nd Half
Distance13.11 mi
Time3:01:29
Pace13:51 /mi
📊Positive Split: 46.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:4129:499:3629:49
9:36
-
10K
6.21 mi12:14:0657:149:1327:25
8:49
-0:47
15K
9.32 mi12:41:431:24:519:0627:37
8:53
+0:04
20K
12.43 mi13:13:071:56:159:2131:24
10:06
+1:13
Half
13.11 mi13:20:482:03:569:277:41
11:16
+1:10
25K
15.53 mi13:55:352:38:4310:1334:47
14:21
+3:05
30K
18.64 mi14:41:043:24:1210:5745:29
14:38
+0:17
20M
20.00 mi14:59:073:42:1511:0718:03
13:17
-1:21
21M
21.00 mi15:14:093:57:1711:1815:02
15:02
+1:45
35K
21.75 mi15:24:124:07:2011:2210:03
13:26
-1:36
23M
23.00 mi15:41:344:24:4211:3117:22
13:52
+0:26
24M
24.00 mi15:53:514:36:5911:3212:17
12:17
-1:35
40K
24.85 mi16:05:074:48:1511:3611:16
13:11
+0:54
25.2M
25.20 mi16:09:414:52:4911:374:34
13:15
+0:04
Finish
26.22 mi16:22:175:05:2511:3912:36
12:22
-0:53

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

8:49 /mi

Average Pace

11:39 /mi

Slowest Pace

15:02 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:03:56

41% of race

Time at Steady Pace

1:26:11

28% of race

Time at Slower Pace

1:35:18

31% of race

Average Pace: 11:39 /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 mi11:46:4129:499:3629:49
9:36
#22366
10K
6.21 mi12:14:0657:149:1327:25
8:49
#21436
15K
9.32 mi12:41:431:24:519:0627:37
8:53
#21040
20K
12.43 mi13:13:071:56:159:2131:24
10:06
#21683
Half
13.11 mi13:20:482:03:569:277:41
11:16
#21951
25K
15.53 mi13:55:352:38:4310:1334:47
14:21
#23632
30K
18.64 mi14:41:043:24:1210:5745:29
14:38
#24593
20M
20.00 mi14:59:073:42:1511:0718:03
13:17
#24708
21M
21.00 mi15:14:093:57:1711:1815:02
15:02
#24816
35K
21.75 mi15:24:124:07:2011:2210:03
13:26
#24897
23M
23.00 mi15:41:344:24:4211:3117:22
13:52
#25003
24M
24.00 mi15:53:514:36:5911:3212:17
12:17
#25013
40K
24.85 mi16:05:074:48:1511:3611:16
13:11
#25038
25.2M
25.20 mi16:09:414:52:4911:374:34
13:15
#25027
Finish
26.22 mi16:22:175:05:2511:3912:36
12:22
#25060
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi22366132901329019987(Top 75%)12293(Top 81%)12293(Top 233%)
10K6.21 mi3.10 mi21436+93012867+42312867+42320061(Top 75%)12312(Top 81%)12312(Top 233%)
15K9.32 mi3.11 mi21040+39612711+15612711+15619987(Top 75%)12293(Top 81%)12293(Top 233%)
20K12.43 mi3.11 mi21683-64313013-30213013-30223125(Top 87%)13689(Top 90%)13689(Top 259%)
Half13.11 mi0.68 mi21951-26813128-11513128-11525259(Top 95%)14584(Top 96%)14584(Top 276%)
25K15.53 mi2.42 mi23632-168113916-78813916-78826448(Top 99%)15096(Top 99%)15096(Top 286%)
30K18.64 mi3.11 mi24593-96114316-40014316-40026306(Top 99%)15026(Top 99%)15026(Top 284%)
20M20.00 mi1.36 mi24708-11514358-4214358-4225387(Top 95%)14569(Top 96%)14569(Top 276%)
21M21.00 mi1.00 mi24816-10814399-4114399-4125739(Top 97%)14742(Top 97%)14742(Top 279%)
35K21.75 mi0.75 mi24897-8114423-2414423-2425831(Top 97%)14752(Top 97%)14752(Top 279%)
23M23.00 mi1.25 mi25003-10614456-3314456-3325743(Top 97%)14699(Top 97%)14699(Top 278%)
24M24.00 mi1.00 mi25013-1014458-214458-224832(Top 93%)14212(Top 94%)14212(Top 269%)
40K24.85 mi0.85 mi25038-2514468-1014468-1025080(Top 94%)14341(Top 94%)14341(Top 271%)
25.2M25.20 mi0.35 mi25027+1114455+1314455+1324247(Top 91%)13918(Top 92%)13918(Top 263%)
Finish26.22 mi1.02 mi25060-3314465-1014465-1025571(Top 96%)14591(Top 96%)14591(Top 276%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 75%
×21stories
+97ft-345ft

Overall

19987

Males

12293

M18-39

12293

5K→10K

3.1 - 6.2 mi

Top 75%
×5stories
+79ft-138ft

Overall

20061

Males

12312

M18-39

12312

10K→15K

6.2 - 9.3 mi

Top 75%
×3stories
+67ft-78ft

Overall

19987

Males

12293

M18-39

12293

15K→20K

9.3 - 12.4 mi

Top 87%
×5stories
+106ft-86ft

Overall

23125

Males

13689

M18-39

13689

20K→Half

12.4 - 13.1 mi

Top 95%
×2stories
+19ft-37ft

Overall

25259

Males

14584

M18-39

14584

Half→25K

13.1 - 15.5 mi

Top 99%
×4stories
+66ft-88ft

Overall

26448

Males

15096

M18-39

15096

25K→30K

15.5 - 18.6 mi

Top 99%
×9stories
+181ft-148ft

Overall

26306

Males

15026

M18-39

15026

30K→20M

18.6 - 20.0 mi

Top 95%
×5stories
+64ft-50ft

Overall

25387

Males

14569

M18-39

14569

20M→21M

20.0 - 21.0 mi

Top 97%
×8stories
+106ft-24ft

Overall

25739

Males

14742

M18-39

14742

21M→35K

21.0 - 21.8 mi

Top 97%
×7stories
+17ft-86ft

Overall

25831

Males

14752

M18-39

14752

35K→23M

21.8 - 23.0 mi

Top 97%
×5stories
+23ft-63ft

Overall

25743

Males

14699

M18-39

14699

23M→24M

23.0 - 24.0 mi

Top 93%
×6stories
+12ft-82ft

Overall

24832

Males

14212

M18-39

14212

24M→40K

24.0 - 24.9 mi

Top 94%
×1story
+6ft-20ft

Overall

25080

Males

14341

M18-39

14341

40K→25.2M

24.9 - 25.2 mi

Top 91%
×1story
+13ft-16ft

Overall

24247

Males

13918

M18-39

13918

25.2M→Finish

25.2 - 26.2 mi

Top 96%
×2stories
+22ft-21ft

Overall

25571

Males

14591

M18-39

14591

Passing Analysis

Category:
Athletes Passed
1513
Passed By
4207
Net Change
-2694
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22366
5K → 10K95424+930#22366#21436
10K → 15K43438+396#21436#21040
15K → 20K18661-643#21040#21683
20K → Half1269-268#21683#21951
Half → 25K31684-1681#21951#23632
25K → 30K8969-961#23632#24593
30K → 20M16131-115#24593#24708
20M → 21M7115-108#24708#24816
21M → 35K889-81#24816#24897
35K → 23M10116-106#24897#25003
23M → 24M1424-10#25003#25013
24M → 40K1641-25#25013#25038
40K → 25.2M198+11#25038#25027
25.2M → Finish538-33#25027#25060
TOTALS15134207-2694
📊

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