Boston Marathon logo
BOSTON MARATHON 2023

Justin Laferriere

Bib: 26068•M

FL

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
33:02
Rank: #25021
Start → 5K
10:38/mi
33:02 split
10K· 6.21 mi
1:03:46
Rank: #24183 (+838)
5K → 10K
9:54/mi
30:44 split
15K· 9.32 mi
1:34:25
Rank: #23863 (+320)
10K → 15K
9:52/mi
30:39 split
20K· 12.43 mi
2:04:47
Rank: #23511 (+352)
15K → 20K
9:46/mi
30:22 split
Half· 13.11 mi
2:11:12
Rank: #23426 (+85)
20K → Half
9:24/mi
6:25 split
25K· 15.53 mi
2:35:05
Rank: #23164 (+262)
Half → 25K
9:51/mi
23:53 split
30K· 18.64 mi
3:07:45
Rank: #22970 (+194)
25K → 30K
10:31/mi
32:40 split
20M
3:21:52
Rank: #22831 (+139)
30K → 20M
10:23/mi
14:07 split
21M
3:33:48
Rank: #22841 (-10)
20M → 21M
11:56/mi
11:56 split
35K· 21.75 mi
3:41:29
Rank: #22799 (+42)
21M → 35K
10:16/mi
7:41 split
23M
3:54:31
Rank: #22698 (+101)
35K → 23M
10:25/mi
13:02 split
24M
4:05:19
Rank: #22685 (+13)
23M → 24M
10:48/mi
10:48 split
40K· 24.85 mi
4:15:00
Rank: #22704 (-19)
24M → 40K
11:20/mi
9:41 split
25.2M
4:19:17
Rank: #22709 (-5)
40K → 25.2M
12:25/mi
4:17 split
Finish· 26.22 mi
4:28:49
Rank: #22637 (+72)
25.2M → Finish
9:21/mi
9:32 split

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
Time2:11:12
Pace10:00 /mi
2nd Half
Distance13.11 mi
Time2:17:37
Pace10:30 /mi
📊Positive Split: 4.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:49:2333:0210:3833:02
10:38
-
10K
6.21 mi12:20:071:03:4610:1630:44
9:54
-0:44
15K
9.32 mi12:50:461:34:2510:0830:39
9:52
-0:02
20K
12.43 mi13:21:082:04:4710:0230:22
9:46
-0:06
Half
13.11 mi13:27:332:11:1210:006:25
9:24
-0:22
25K
15.53 mi13:51:262:35:059:5923:53
9:51
+0:27
30K
18.64 mi14:24:063:07:4510:0432:40
10:31
+0:40
20M
20.00 mi14:38:133:21:5210:0614:07
10:23
-0:08
21M
21.00 mi14:50:093:33:4810:1111:56
11:56
+1:33
35K
21.75 mi14:57:503:41:2910:117:41
10:16
-1:40
23M
23.00 mi15:10:523:54:3110:1213:02
10:25
+0:09
24M
24.00 mi15:21:404:05:1910:1310:48
10:48
+0:23
40K
24.85 mi15:31:214:15:0010:169:41
11:20
+0:32
25.2M
25.20 mi15:35:384:19:1710:174:17
12:25
+1:05
Finish
26.22 mi15:45:104:28:4910:169:32
9:21
-3:04

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

9:21 /mi

Average Pace

10:16 /mi

Slowest Pace

12:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:11:35

49% of race

Time at Steady Pace

1:51:20

41% of race

Time at Slower Pace

25:54

10% of race

Average Pace: 10:15 /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 mi11:49:2333:0210:3833:02
10:38
#25021
10K
6.21 mi12:20:071:03:4610:1630:44
9:54
#24183
15K
9.32 mi12:50:461:34:2510:0830:39
9:52
#23863
20K
12.43 mi13:21:082:04:4710:0230:22
9:46
#23511
Half
13.11 mi13:27:332:11:1210:006:25
9:24
#23426
25K
15.53 mi13:51:262:35:059:5923:53
9:51
#23164
30K
18.64 mi14:24:063:07:4510:0432:40
10:31
#22970
20M
20.00 mi14:38:133:21:5210:0614:07
10:23
#22831
21M
21.00 mi14:50:093:33:4810:1111:56
11:56
#22841
35K
21.75 mi14:57:503:41:2910:117:41
10:16
#22799
23M
23.00 mi15:10:523:54:3110:1213:02
10:25
#22698
24M
24.00 mi15:21:404:05:1910:1310:48
10:48
#22685
40K
24.85 mi15:31:214:15:0010:169:41
11:20
#22704
25.2M
25.20 mi15:35:384:19:1710:174:17
12:25
#22709
Finish
26.22 mi15:45:104:28:4910:169:32
9:21
#22637
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi25021145541455423214(Top 87%)13737(Top 91%)13737(Top 260%)
10K6.21 mi3.10 mi24183+83814174+38014174+38023460(Top 88%)13839(Top 91%)13839(Top 262%)
15K9.32 mi3.11 mi23863+32014028+14614028+14623214(Top 87%)13737(Top 91%)13737(Top 260%)
20K12.43 mi3.11 mi23511+35213876+15213876+15222337(Top 84%)13329(Top 88%)13329(Top 252%)
Half13.11 mi0.68 mi23426+8513840+3613840+3621831(Top 82%)13113(Top 86%)13113(Top 248%)
25K15.53 mi2.42 mi23164+26213697+14313697+14321856(Top 82%)13076(Top 86%)13076(Top 247%)
30K18.64 mi3.11 mi22970+19413582+11513582+11522242(Top 84%)13181(Top 87%)13181(Top 249%)
20M20.00 mi1.36 mi22831+13913501+8113501+8121498(Top 81%)12782(Top 84%)12782(Top 242%)
21M21.00 mi1.00 mi22841-1013499+213499+222643(Top 85%)13266(Top 87%)13266(Top 251%)
35K21.75 mi0.75 mi22799+4213468+3113468+3121921(Top 82%)12892(Top 85%)12892(Top 244%)
23M23.00 mi1.25 mi22698+10113412+5613412+5621090(Top 79%)12492(Top 82%)12492(Top 236%)
24M24.00 mi1.00 mi22685+1313398+1413398+1422658(Top 85%)13186(Top 87%)13186(Top 249%)
40K24.85 mi0.85 mi22704-1913399-113399-122925(Top 86%)13280(Top 88%)13280(Top 251%)
25.2M25.20 mi0.35 mi22709-5133991339923149(Top 87%)13389(Top 88%)13389(Top 253%)
Finish26.22 mi1.02 mi22637+7213355+4413355+4419600(Top 74%)11806(Top 78%)11806(Top 223%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 87%
×21story building
+97ft-345ft

Overall

23214

Males

13737

M18-39

13737

5K→10K

3.1 - 6.2 mi

Top 88%
×5story building
+79ft-138ft

Overall

23460

Males

13839

M18-39

13839

10K→15K

6.2 - 9.3 mi

Top 87%
×3story building
+67ft-78ft

Overall

23214

Males

13737

M18-39

13737

15K→20K

9.3 - 12.4 mi

Top 84%
×5story building
+106ft-86ft

Overall

22337

Males

13329

M18-39

13329

20K→Half

12.4 - 13.1 mi

Top 82%
×2story building
+19ft-37ft

Overall

21831

Males

13113

M18-39

13113

Half→25K

13.1 - 15.5 mi

Top 82%
×4story building
+66ft-88ft

Overall

21856

Males

13076

M18-39

13076

25K→30K

15.5 - 18.6 mi

Top 84%
×9story building
+181ft-148ft

Overall

22242

Males

13181

M18-39

13181

30K→20M

18.6 - 20.0 mi

Top 81%
×5story building
+64ft-50ft

Overall

21498

Males

12782

M18-39

12782

20M→21M

20.0 - 21.0 mi

Top 85%
×8story building
+106ft-24ft

Overall

22643

Males

13266

M18-39

13266

21M→35K

21.0 - 21.8 mi

Top 82%
×7story building
+17ft-86ft

Overall

21921

Males

12892

M18-39

12892

35K→23M

21.8 - 23.0 mi

Top 79%
×5story building
+23ft-63ft

Overall

21090

Males

12492

M18-39

12492

23M→24M

23.0 - 24.0 mi

Top 85%
×6story building
+12ft-82ft

Overall

22658

Males

13186

M18-39

13186

24M→40K

24.0 - 24.9 mi

Top 86%
×1story
+6ft-20ft

Overall

22925

Males

13280

M18-39

13280

40K→25.2M

24.9 - 25.2 mi

Top 87%
×1story
+13ft-16ft

Overall

23149

Males

13389

M18-39

13389

25.2M→Finish

25.2 - 26.2 mi

Top 74%
×2story building
+22ft-21ft

Overall

19600

Males

11806

M18-39

11806

Passing Analysis

Category:
Athletes Passed
2668
Passed By
284
Net Change
+2384
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#25021
5K → 10K8479+838#25021#24183
10K → 15K34424+320#24183#23863
15K → 20K36210+352#23863#23511
20K → Half872+85#23511#23426
Half → 25K27513+262#23426#23164
25K → 30K23238+194#23164#22970
30K → 20M14910+139#22970#22831
20M → 21M4656-10#22831#22841
21M → 35K5715+42#22841#22799
35K → 23M1076+101#22799#22698
23M → 24M4431+13#22698#22685
24M → 40K2645-19#22685#22704
40K → 25.2M1318-5#22704#22709
25.2M → Finish797+72#22709#22637
TOTALS2668284+2384
📊

Passing Visuals

Category:
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