Boston Marathon logo
BOSTON MARATHON 2023

Leilani Castro

Bib: 27151•F

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Female)
#0 / 11423
Masters (Masters Women)
#0 / 6539
Division (F40-44)
#0 / 1878
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
11:19/mi
35:10
↑ 97↓ 3451.5%
10K· 6.21 mi
10:54/mi
1:09:03
↑ 79↓ 1380.4%
15K· 9.32 mi
11:13/mi
1:43:54
↑ 67↓ 78
20K· 12.43 mi
12:00/mi
2:21:12
↑ 106↓ 860.1%
Half· 13.11 mi
11:32/mi
2:29:04
↑ 19↓ 370.5%
25K· 15.53 mi
11:56/mi
2:58:01
↑ 66↓ 880.2%
30K· 18.64 mi
12:56/mi
3:38:12
↑ 181↓ 1480.2%
20M
12:40/mi
3:55:25
↑ 64↓ 500.2%
21M
14:03/mi
4:09:28
↑ 106↓ 241.6%
35K· 21.75 mi
11:36/mi
4:18:09
↑ 17↓ 861.7%
23M
11:51/mi
4:32:59
↑ 23↓ 630.6%
24M
11:44/mi
4:44:43
↓ 821.3%
40K· 24.85 mi
11:17/mi
4:54:22
↓ 200.3%
25.2M
13:29/mi
4:59:01
↑ 13↓ 160.2%
Finish· 26.22 mi
11:00/mi
5:10:14
↑ 22↓ 21

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
Time2:29:04
Pace11:22 /mi
2nd Half
Distance13.11 mi
Time2:41:10
Pace12:18 /mi
📊Positive Split: 8.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:52:4935:1011:1935:10
11:19
-
10K
6.21 mi12:26:421:09:0311:0733:53
10:54
-0:25
15K
9.32 mi13:01:331:43:5411:0934:51
11:13
+0:19
20K
12.43 mi13:38:512:21:1211:2237:18
12:00
+0:47
Half
13.11 mi13:46:432:29:0411:227:52
11:32
-0:28
25K
15.53 mi14:15:402:58:0111:2828:57
11:56
+0:24
30K
18.64 mi14:55:513:38:1211:4240:11
12:56
+1:00
20M
20.00 mi15:13:043:55:2511:4617:13
12:40
-0:16
21M
21.00 mi15:27:074:09:2811:5314:03
14:03
+1:23
35K
21.75 mi15:35:484:18:0911:528:41
11:36
-2:27
23M
23.00 mi15:50:384:32:5911:5214:50
11:51
+0:15
24M
24.00 mi16:02:224:44:4311:5211:44
11:44
-0:07
40K
24.85 mi16:12:014:54:2211:519:39
11:17
-0:27
25.2M
25.20 mi16:16:404:59:0111:524:39
13:29
+2:12
Finish
26.22 mi16:27:535:10:1411:5011:13
11:00
-2:29

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

10:54 /mi

Average Pace

11:50 /mi

Slowest Pace

14:03 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:29:36

29% of race

Time at Steady Pace

2:24:32

47% of race

Time at Slower Pace

1:16:06

25% of race

Average Pace: 11:50 /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 mi11:52:4935:1011:1935:10
11:19
#26056
10K
6.21 mi12:26:421:09:0311:0733:53
10:54
#25739
15K
9.32 mi13:01:331:43:5411:0934:51
11:13
#25641
20K
12.43 mi13:38:512:21:1211:2237:18
12:00
#25649
Half
13.11 mi13:46:432:29:0411:227:52
11:32
#25656
25K
15.53 mi14:15:402:58:0111:2828:57
11:56
#25565
30K
18.64 mi14:55:513:38:1211:4240:11
12:56
#25540
20M
20.00 mi15:13:043:55:2511:4617:13
12:40
#25508
21M
21.00 mi15:27:074:09:2811:5314:03
14:03
#25483
35K
21.75 mi15:35:484:18:0911:528:41
11:36
#25451
23M
23.00 mi15:50:384:32:5911:5214:50
11:51
#25391
24M
24.00 mi16:02:224:44:4311:5211:44
11:44
#25353
40K
24.85 mi16:12:014:54:2211:519:39
11:17
#25287
25.2M
25.20 mi16:16:404:59:0111:524:39
13:29
#25286
Finish
26.22 mi16:27:535:10:1411:5011:13
11:00
#25239
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi26056110861108625444(Top 96%)10709(Top 94%)10709(Top 570%)
10K6.21 mi3.10 mi25739+31710885+20110885+20125355(Top 95%)10641(Top 93%)10641(Top 567%)
15K9.32 mi3.11 mi25641+9810819+6610819+6625444(Top 96%)10709(Top 94%)10709(Top 570%)
20K12.43 mi3.11 mi25649-810837-1810837-1825663(Top 96%)10863(Top 95%)10863(Top 578%)
Half13.11 mi0.68 mi25656-710845-810845-825522(Top 96%)10798(Top 95%)10798(Top 575%)
25K15.53 mi2.42 mi25565+9110796+4910796+4925113(Top 94%)10582(Top 93%)10582(Top 563%)
30K18.64 mi3.11 mi25540+25107961079625361(Top 95%)10768(Top 94%)10768(Top 573%)
20M20.00 mi1.36 mi25508+3210786+1010786+1024896(Top 94%)10549(Top 92%)10549(Top 562%)
21M21.00 mi1.00 mi25483+2510777+910777+925079(Top 94%)10652(Top 93%)10652(Top 567%)
35K21.75 mi0.75 mi25451+3210761+1610761+1624241(Top 91%)10254(Top 90%)10254(Top 546%)
23M23.00 mi1.25 mi25391+6010731+3010731+3023797(Top 89%)10003(Top 88%)10003(Top 533%)
24M24.00 mi1.00 mi25353+3810719+1210719+1224197(Top 91%)10276(Top 90%)10276(Top 547%)
40K24.85 mi0.85 mi25287+6610683+3610683+3622897(Top 86%)9613(Top 84%)9613(Top 512%)
25.2M25.20 mi0.35 mi25286+1106831068324522(Top 92%)10452(Top 91%)10452(Top 557%)
Finish26.22 mi1.02 mi25239+4710665+1810665+1823998(Top 90%)10165(Top 89%)10165(Top 541%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 96%
×21story building
+97ft-345ft

Overall

25444

Females

10709

F40-44

10709

5K→10K

3.1 - 6.2 mi

Top 95%
×5story building
+79ft-138ft

Overall

25355

Females

10641

F40-44

10641

10K→15K

6.2 - 9.3 mi

Top 96%
×3story building
+67ft-78ft

Overall

25444

Females

10709

F40-44

10709

15K→20K

9.3 - 12.4 mi

Top 96%
×5story building
+106ft-86ft

Overall

25663

Females

10863

F40-44

10863

20K→Half

12.4 - 13.1 mi

Top 96%
×2story building
+19ft-37ft

Overall

25522

Females

10798

F40-44

10798

Half→25K

13.1 - 15.5 mi

Top 94%
×4story building
+66ft-88ft

Overall

25113

Females

10582

F40-44

10582

25K→30K

15.5 - 18.6 mi

Top 95%
×9story building
+181ft-148ft

Overall

25361

Females

10768

F40-44

10768

30K→20M

18.6 - 20.0 mi

Top 94%
×5story building
+64ft-50ft

Overall

24896

Females

10549

F40-44

10549

20M→21M

20.0 - 21.0 mi

Top 94%
×8story building
+106ft-24ft

Overall

25079

Females

10652

F40-44

10652

21M→35K

21.0 - 21.8 mi

Top 91%
×7story building
+17ft-86ft

Overall

24241

Females

10254

F40-44

10254

35K→23M

21.8 - 23.0 mi

Top 89%
×5story building
+23ft-63ft

Overall

23797

Females

10003

F40-44

10003

23M→24M

23.0 - 24.0 mi

Top 91%
×6story building
+12ft-82ft

Overall

24197

Females

10276

F40-44

10276

24M→40K

24.0 - 24.9 mi

Top 86%
×1story
+6ft-20ft

Overall

22897

Females

9613

F40-44

9613

40K→25.2M

24.9 - 25.2 mi

Top 92%
×1story
+13ft-16ft

Overall

24522

Females

10452

F40-44

10452

25.2M→Finish

25.2 - 26.2 mi

Top 90%
×2story building
+22ft-21ft

Overall

23998

Females

10165

F40-44

10165

Passing Analysis

Category:
Athletes Passed
1122
Passed By
305
Net Change
+817
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#26056
5K → 10K33821+317#26056#25739
10K → 15K14446+98#25739#25641
15K → 20K8391-8#25641#25649
20K → Half2027-7#25649#25656
Half → 25K10615+91#25656#25565
25K → 30K7954+25#25565#25540
30K → 20M5220+32#25540#25508
20M → 21M349+25#25508#25483
21M → 35K397+32#25483#25451
35K → 23M622+60#25451#25391
23M → 24M446+38#25391#25353
24M → 40K682+66#25353#25287
40K → 25.2M32+1#25287#25286
25.2M → Finish503+47#25286#25239
TOTALS1122305+817
📊

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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing