Boston Marathon logo
BOSTON MARATHON 2023

Jenna Castro

Bib: 8135•F

MA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 25%
Gender (Female)
#0 / 11423
Top 7%
Division (F18-39)
#0 / 4884
Top 13%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:58
Rank: #4143
Start → 5K
20:58 | 6:45/mi
10K· 6.21 mi
42:00
Rank: #4604 (-461)
5K → 10K
21:02 | 6:46/mi
15K· 9.32 mi
1:03:04
Rank: #4673 (-69)
10K → 15K
21:04 | 6:47/mi
20K· 12.43 mi
1:24:26
Rank: #4792 (-119)
15K → 20K
21:22 | 6:53/mi
Half· 13.11 mi
1:29:09
Rank: #4872 (-80)
20K → Half
4:43 | 6:55/mi
25K· 15.53 mi
1:46:37
Rank: #5315 (-443)
Half → 25K
17:28 | 7:12/mi
30K· 18.64 mi
2:09:24
Rank: #5482 (-167)
25K → 30K
22:47 | 7:20/mi
20M
2:19:38
Rank: #5555 (-73)
30K → 20M
10:14 | 7:32/mi
21M
2:28:02
Rank: #5709 (-154)
20M → 21M
8:24 | 8:24/mi
35K· 21.75 mi
2:34:46
Rank: #6065 (-356)
21M → 35K
6:44 | 9:00/mi
23M
2:44:34
Rank: #6138 (-73)
35K → 23M
9:48 | 7:50/mi
24M
2:52:30
Rank: #6243 (-105)
23M → 24M
7:56 | 7:56/mi
40K· 24.85 mi
2:59:35
Rank: #6386 (-143)
24M → 40K
7:05 | 8:17/mi
25.2M
3:02:37
Rank: #6432 (-46)
40K → 25.2M
3:02 | 8:48/mi
Finish· 26.22 mi
3:10:52
Rank: #6609 (-177)
25.2M → Finish
8:15 | 8:06/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
Time1:29:09
Pace6:48 /mi
2nd Half
Distance13.11 mi
Time1:41:43
Pace7:46 /mi
📊Positive Split: 14.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:46:0420:586:4520:58
6:45
-
10K
6.21 mi11:07:0642:006:4621:02
6:46
+0:01
15K
9.32 mi11:28:101:03:046:4621:04
6:47
+0:01
20K
12.43 mi11:49:321:24:266:4821:22
6:53
+0:06
Half
13.11 mi11:54:151:29:096:484:43
6:55
+0:02
25K
15.53 mi12:11:431:46:376:5217:28
7:12
+0:17
30K
18.64 mi12:34:302:09:246:5622:47
7:20
+0:08
20M
20.00 mi12:44:442:19:386:5910:14
7:32
+0:12
21M
21.00 mi12:53:082:28:027:038:24
8:24
+0:52
35K
21.75 mi12:59:522:34:467:076:44
9:00
+0:36
23M
23.00 mi13:09:402:44:347:099:48
7:50
-1:10
24M
24.00 mi13:17:362:52:307:117:56
7:56
+0:06
40K
24.85 mi13:24:412:59:357:147:05
8:17
+0:21
25.2M
25.20 mi13:27:433:02:377:153:02
8:48
+0:31
Finish
26.22 mi13:35:583:10:527:178:15
8:06
-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

6:45 /mi

Average Pace

7:17 /mi

Slowest Pace

9:00 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:29:09

47% of race

Time at Steady Pace

1:00:17

32% of race

Time at Slower Pace

41:26

22% of race

Average Pace: 7:17 /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 mi10:46:0420:586:4520:58
6:45
#4143
10K
6.21 mi11:07:0642:006:4621:02
6:46
#4604
15K
9.32 mi11:28:101:03:046:4621:04
6:47
#4673
20K
12.43 mi11:49:321:24:266:4821:22
6:53
#4792
Half
13.11 mi11:54:151:29:096:484:43
6:55
#4872
25K
15.53 mi12:11:431:46:376:5217:28
7:12
#5315
30K
18.64 mi12:34:302:09:246:5622:47
7:20
#5482
20M
20.00 mi12:44:442:19:386:5910:14
7:32
#5555
21M
21.00 mi12:53:082:28:027:038:24
8:24
#5709
35K
21.75 mi12:59:522:34:467:076:44
9:00
#6065
23M
23.00 mi13:09:402:44:347:099:48
7:50
#6138
24M
24.00 mi13:17:362:52:307:117:56
7:56
#6243
40K
24.85 mi13:24:412:59:357:147:05
8:17
#6386
25.2M
25.20 mi13:27:433:02:377:153:02
8:48
#6432
Finish
26.22 mi13:35:583:10:527:178:15
8:06
#6609
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi41432572574955(Top 19%)349(Top 3%)349(Top 7%)
10K6.21 mi3.10 mi4604-461300-43300-435019(Top 19%)367(Top 3%)367(Top 8%)
15K9.32 mi3.11 mi4673-69314-14314-144955(Top 19%)349(Top 3%)349(Top 7%)
20K12.43 mi3.11 mi4792-119322-8322-85189(Top 19%)390(Top 3%)390(Top 8%)
Half13.11 mi0.68 mi4872-80332-10332-106128(Top 23%)545(Top 5%)545(Top 11%)
25K15.53 mi2.42 mi5315-443391-59391-596707(Top 25%)766(Top 7%)766(Top 16%)
30K18.64 mi3.11 mi5482-167424-33424-336232(Top 23%)690(Top 6%)690(Top 14%)
20M20.00 mi1.36 mi5555-73445-21445-217013(Top 26%)1021(Top 9%)1021(Top 21%)
21M21.00 mi1.00 mi5709-154479-34479-349856(Top 37%)2302(Top 20%)2302(Top 47%)
35K21.75 mi0.75 mi6065-356577-98577-9817911(Top 67%)6779(Top 59%)6779(Top 139%)
23M23.00 mi1.25 mi6138-73603-26603-268611(Top 32%)1838(Top 16%)1838(Top 38%)
24M24.00 mi1.00 mi6243-105640-37640-3710784(Top 41%)2963(Top 26%)2963(Top 61%)
40K24.85 mi0.85 mi6386-143694-54694-5411918(Top 45%)3608(Top 32%)3608(Top 74%)
25.2M25.20 mi0.35 mi6432-46709-15709-1511314(Top 42%)3326(Top 29%)3326(Top 68%)
Finish26.22 mi1.02 mi6609-177782-73782-7312747(Top 48%)4071(Top 36%)4071(Top 83%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 19%
×21stories
+97ft-345ft

Overall

4955

Females

349

F18-39

349

5K→10K

3.1 - 6.2 mi

Top 19%
×5stories
+79ft-138ft

Overall

5019

Females

367

F18-39

367

10K→15K

6.2 - 9.3 mi

Top 19%
×3stories
+67ft-78ft

Overall

4955

Females

349

F18-39

349

15K→20K

9.3 - 12.4 mi

Top 19%
×5stories
+106ft-86ft

Overall

5189

Females

390

F18-39

390

20K→Half

12.4 - 13.1 mi

Top 23%
×2stories
+19ft-37ft

Overall

6128

Females

545

F18-39

545

Half→25K

13.1 - 15.5 mi

Top 25%
×4stories
+66ft-88ft

Overall

6707

Females

766

F18-39

766

25K→30K

15.5 - 18.6 mi

Top 23%
×9stories
+181ft-148ft

Overall

6232

Females

690

F18-39

690

30K→20M

18.6 - 20.0 mi

Top 26%
×5stories
+64ft-50ft

Overall

7013

Females

1021

F18-39

1021

20M→21M

20.0 - 21.0 mi

Top 37%
×8stories
+106ft-24ft

Overall

9856

Females

2302

F18-39

2302

21M→35K

21.0 - 21.8 mi

Top 67%
×7stories
+17ft-86ft

Overall

17911

Females

6779

F18-39

6779

35K→23M

21.8 - 23.0 mi

Top 32%
×5stories
+23ft-63ft

Overall

8611

Females

1838

F18-39

1838

23M→24M

23.0 - 24.0 mi

Top 41%
×6stories
+12ft-82ft

Overall

10784

Females

2963

F18-39

2963

24M→40K

24.0 - 24.9 mi

Top 45%
×1story
+6ft-20ft

Overall

11918

Females

3608

F18-39

3608

40K→25.2M

24.9 - 25.2 mi

Top 42%
×1story
+13ft-16ft

Overall

11314

Females

3326

F18-39

3326

25.2M→Finish

25.2 - 26.2 mi

Top 48%
×2stories
+22ft-21ft

Overall

12747

Females

4071

F18-39

4071

Passing Analysis

Category:
Athletes Passed
527
Passed By
2993
Net Change
-2466
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4143
5K → 10K73534-461#4143#4604
10K → 15K96165-69#4604#4673
15K → 20K62181-119#4673#4792
20K → Half1090-80#4792#4872
Half → 25K30473-443#4872#5315
25K → 30K78245-167#5315#5482
30K → 20M35108-73#5482#5555
20M → 21M15169-154#5555#5709
21M → 35K4360-356#5709#6065
35K → 23M47120-73#6065#6138
23M → 24M31136-105#6138#6243
24M → 40K18161-143#6243#6386
40K → 25.2M1460-46#6386#6432
25.2M → Finish14191-177#6432#6609
TOTALS5272993-2466
📊

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