Boston Marathon logo
BOSTON MARATHON 2023

Carl Hartford

Bib: 1578•M

MA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 6%
Gender (Male)
#0 / 15176
Top 10%
Division (M18-39)
#0 / 5285
Top 24%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:15
Rank: #1127
Start → 5K
6:12/mi
19:15 split
10K· 6.21 mi
38:28
Rank: #1173 (-46)
5K → 10K
6:11/mi
19:13 split
15K· 9.32 mi
57:51
Rank: #1214 (-41)
10K → 15K
6:14/mi
19:23 split
20K· 12.43 mi
1:17:19
Rank: #1207 (+7)
15K → 20K
6:16/mi
19:28 split
Half· 13.11 mi
1:21:32
Rank: #1212 (-5)
20K → Half
6:11/mi
4:13 split
25K· 15.53 mi
1:36:45
Rank: #1207 (+5)
Half → 25K
6:17/mi
15:13 split
30K· 18.64 mi
1:56:34
Rank: #1180 (+27)
25K → 30K
6:23/mi
19:49 split
20M
2:05:30
Rank: #1201 (-21)
30K → 20M
6:34/mi
8:56 split
21M
2:12:29
Rank: #1224 (-23)
20M → 21M
6:59/mi
6:59 split
35K· 21.75 mi
2:17:24
Rank: #1255 (-31)
21M → 35K
6:34/mi
4:55 split
23M
2:26:19
Rank: #1380 (-125)
35K → 23M
7:07/mi
8:55 split
24M
2:33:29
Rank: #1484 (-104)
23M → 24M
7:10/mi
7:10 split
40K· 24.85 mi
2:39:36
Rank: #1559 (-75)
24M → 40K
7:09/mi
6:07 split
25.2M
2:42:14
Rank: #1590 (-31)
40K → 25.2M
7:38/mi
2:38 split
Finish· 26.22 mi
2:49:18
Rank: #1661 (-71)
25.2M → Finish
6:56/mi
7:04 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
Time1:21:32
Pace6:13 /mi
2nd Half
Distance13.11 mi
Time1:27:46
Pace6:42 /mi
📊Positive Split: 7.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:19:3119:156:1219:15
6:12
-
10K
6.21 mi10:38:4438:286:1119:13
6:11
-0:01
15K
9.32 mi10:58:0757:516:1219:23
6:14
+0:03
20K
12.43 mi11:17:351:17:196:1319:28
6:16
+0:02
Half
13.11 mi11:21:481:21:326:134:13
6:11
-0:05
25K
15.53 mi11:37:011:36:456:1415:13
6:17
+0:06
30K
18.64 mi11:56:501:56:346:1519:49
6:23
+0:06
20M
20.00 mi12:05:462:05:306:168:56
6:34
+0:11
21M
21.00 mi12:12:452:12:296:196:59
6:59
+0:25
35K
21.75 mi12:17:402:17:246:194:55
6:34
-0:25
23M
23.00 mi12:26:352:26:196:228:55
7:07
+0:33
24M
24.00 mi12:33:452:33:296:247:10
7:10
+0:03
40K
24.85 mi12:39:522:39:366:256:07
7:09
-0:01
25.2M
25.20 mi12:42:302:42:146:262:38
7:38
+0:29
Finish
26.22 mi12:49:342:49:186:287:04
6:56
-0:42

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

6:11 /mi

Average Pace

6:28 /mi

Slowest Pace

7:38 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:36:45

57% of race

Time at Steady Pace

33:40

20% of race

Time at Slower Pace

38:53

23% of race

Average Pace: 6:27 /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 mi10:19:3119:156:1219:15
6:12
#1127
10K
6.21 mi10:38:4438:286:1119:13
6:11
#1173
15K
9.32 mi10:58:0757:516:1219:23
6:14
#1214
20K
12.43 mi11:17:351:17:196:1319:28
6:16
#1207
Half
13.11 mi11:21:481:21:326:134:13
6:11
#1212
25K
15.53 mi11:37:011:36:456:1415:13
6:17
#1207
30K
18.64 mi11:56:501:56:346:1519:49
6:23
#1180
20M
20.00 mi12:05:462:05:306:168:56
6:34
#1201
21M
21.00 mi12:12:452:12:296:196:59
6:59
#1224
35K
21.75 mi12:17:402:17:246:194:55
6:34
#1255
23M
23.00 mi12:26:352:26:196:228:55
7:07
#1380
24M
24.00 mi12:33:452:33:296:247:10
7:10
#1484
40K
24.85 mi12:39:522:39:366:256:07
7:09
#1559
25.2M
25.20 mi12:42:302:42:146:262:38
7:38
#1590
Finish
26.22 mi12:49:342:49:186:287:04
6:56
#1661
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi1127106510651381(Top 5%)1315(Top 9%)1315(Top 25%)
10K6.21 mi3.10 mi1173-461110-451110-451296(Top 5%)1233(Top 8%)1233(Top 23%)
15K9.32 mi3.11 mi1214-411151-411151-411381(Top 5%)1315(Top 9%)1315(Top 25%)
20K12.43 mi3.11 mi1207+71149+21149+21273(Top 5%)1218(Top 8%)1218(Top 23%)
Half13.11 mi0.68 mi1212-51154-51154-51307(Top 5%)1255(Top 8%)1255(Top 24%)
25K15.53 mi2.42 mi1207+51152+21152+21256(Top 5%)1200(Top 8%)1200(Top 23%)
30K18.64 mi3.11 mi1180+271125+271125+271154(Top 4%)1099(Top 7%)1099(Top 21%)
20M20.00 mi1.36 mi1201-211147-221147-221726(Top 6%)1646(Top 11%)1646(Top 31%)
21M21.00 mi1.00 mi1224-231170-231170-232058(Top 8%)1944(Top 13%)1944(Top 37%)
35K21.75 mi0.75 mi1255-311199-291199-292775(Top 10%)2602(Top 17%)2602(Top 49%)
23M23.00 mi1.25 mi1380-1251316-1171316-1174375(Top 16%)3984(Top 26%)3984(Top 75%)
24M24.00 mi1.00 mi1484-1041415-991415-995513(Top 21%)4775(Top 31%)4775(Top 90%)
40K24.85 mi0.85 mi1559-751489-741489-744602(Top 17%)4053(Top 27%)4053(Top 77%)
25.2M25.20 mi0.35 mi1590-311520-311520-314445(Top 17%)3858(Top 25%)3858(Top 73%)
Finish26.22 mi1.02 mi1661-711585-651585-654795(Top 18%)4118(Top 27%)4118(Top 78%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 5%
×21story building
+97ft-345ft

Overall

1381

Males

1315

M18-39

1315

5K→10K

3.1 - 6.2 mi

Top 5%
×5story building
+79ft-138ft

Overall

1296

Males

1233

M18-39

1233

10K→15K

6.2 - 9.3 mi

Top 5%
×3story building
+67ft-78ft

Overall

1381

Males

1315

M18-39

1315

15K→20K

9.3 - 12.4 mi

Top 5%
×5story building
+106ft-86ft

Overall

1273

Males

1218

M18-39

1218

20K→Half

12.4 - 13.1 mi

Top 5%
×2story building
+19ft-37ft

Overall

1307

Males

1255

M18-39

1255

Half→25K

13.1 - 15.5 mi

Top 5%
×4story building
+66ft-88ft

Overall

1256

Males

1200

M18-39

1200

25K→30K

15.5 - 18.6 mi

Top 4%
×9story building
+181ft-148ft

Overall

1154

Males

1099

M18-39

1099

30K→20M

18.6 - 20.0 mi

Top 6%
×5story building
+64ft-50ft

Overall

1726

Males

1646

M18-39

1646

20M→21M

20.0 - 21.0 mi

Top 8%
×8story building
+106ft-24ft

Overall

2058

Males

1944

M18-39

1944

21M→35K

21.0 - 21.8 mi

Top 10%
×7story building
+17ft-86ft

Overall

2775

Males

2602

M18-39

2602

35K→23M

21.8 - 23.0 mi

Top 16%
×5story building
+23ft-63ft

Overall

4375

Males

3984

M18-39

3984

23M→24M

23.0 - 24.0 mi

Top 21%
×6story building
+12ft-82ft

Overall

5513

Males

4775

M18-39

4775

24M→40K

24.0 - 24.9 mi

Top 17%
×1story
+6ft-20ft

Overall

4602

Males

4053

M18-39

4053

40K→25.2M

24.9 - 25.2 mi

Top 17%
×1story
+13ft-16ft

Overall

4445

Males

3858

M18-39

3858

25.2M→Finish

25.2 - 26.2 mi

Top 18%
×2story building
+22ft-21ft

Overall

4795

Males

4118

M18-39

4118

Passing Analysis

Category:
Athletes Passed
236
Passed By
770
Net Change
-534
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1127
5K → 10K3379-46#1127#1173
10K → 15K2061-41#1173#1214
15K → 20K4033+7#1214#1207
20K → Half38-5#1207#1212
Half → 25K2520+5#1212#1207
25K → 30K5023+27#1207#1180
30K → 20M1334-21#1180#1201
20M → 21M1437-23#1201#1224
21M → 35K1344-31#1224#1255
35K → 23M4129-125#1255#1380
23M → 24M5109-104#1380#1484
24M → 40K1085-75#1484#1559
40K → 25.2M132-31#1559#1590
25.2M → Finish576-71#1590#1661
TOTALS236770-534
📊

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