Boston Marathon logo
BOSTON MARATHON 2023

Samantha Williams

CA

Bib: 13906 F

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 33%
Gender (Female)
#0 / 11423
Top 14%
Division (F18-39)
#0 / 4884
Top 25%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:33/mi
23:27
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:27/mi
46:35
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:28/mi
1:09:46
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:27/mi
1:32:56
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:20/mi
1:37:56
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:27/mi
1:56:01
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:43/mi
2:20:01
↑ 181↓ 1480.2%
138 ft elev
20M
7:46/mi
2:30:34
↑ 64↓ 500.2%
148 ft elev
21M
8:05/mi
2:38:39
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
7:40/mi
2:44:23
↑ 17↓ 861.7%
156 ft elev
23M
7:49/mi
2:54:10
↑ 23↓ 630.6%
116 ft elev
24M
7:40/mi
3:01:50
↓ 821.3%
34 ft elev
40K· 24.85 mi
7:43/mi
3:08:26
↓ 200.3%
20 ft elev
25.2M
8:10/mi
3:11:15
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
7:19/mi
3:18:42
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Is this your race?

Claim it for a free AI report

A coach's-eye read of your race — emailed to you, free.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:37:56
Pace7:28 /mi
2nd Half
Distance13.11 mi
Time1:40:46
Pace7:41 /mi
📊Positive Split: 2.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:2323:277:3323:27
7:33
-
10K
6.21 mi11:14:3146:357:3023:08
7:27
-0:06
15K
9.32 mi11:37:421:09:467:2923:11
7:28
+0:01
20K
12.43 mi12:00:521:32:567:2923:10
7:27
-0:01
Half
13.11 mi12:05:521:37:567:285:00
7:20
-0:07
25K
15.53 mi12:23:571:56:017:2818:05
7:27
+0:07
30K
18.64 mi12:47:572:20:017:3124:00
7:43
+0:16
20M
20.00 mi12:58:302:30:347:3210:33
7:46
+0:03
21M
21.00 mi13:06:352:38:397:338:05
8:05
+0:19
35K
21.75 mi13:12:192:44:237:345:44
7:40
-0:25
23M
23.00 mi13:22:062:54:107:349:47
7:49
+0:09
24M
24.00 mi13:29:463:01:507:357:40
7:40
-0:09
40K
24.85 mi13:36:223:08:267:356:36
7:43
+0:03
25.2M
25.20 mi13:39:113:11:157:352:49
8:10
+0:27
Finish
26.22 mi13:46:383:18:427:357:27
7:19
-0:51

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

7:19 /mi

Average Pace

7:35 /mi

Slowest Pace

8:10 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:07:48

95% of race

Time at Steady Pace

10:54

5% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:35 /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 mi10:51:2323:277:3323:27
7:33
#10065
10K
6.21 mi11:14:3146:357:3023:08
7:27
#9999
15K
9.32 mi11:37:421:09:467:2923:11
7:28
#9907
20K
12.43 mi12:00:521:32:567:2923:10
7:27
#9639
Half
13.11 mi12:05:521:37:567:285:00
7:20
#9592
25K
15.53 mi12:23:571:56:017:2818:05
7:27
#9382
30K
18.64 mi12:47:572:20:017:3124:00
7:43
#9244
20M
20.00 mi12:58:302:30:347:3210:33
7:46
#9181
21M
21.00 mi13:06:352:38:397:338:05
8:05
#9060
35K
21.75 mi13:12:192:44:237:345:44
7:40
#9078
23M
23.00 mi13:22:062:54:107:349:47
7:49
#9017
24M
24.00 mi13:29:463:01:507:357:40
7:40
#8992
40K
24.85 mi13:36:223:08:267:356:36
7:43
#8931
25.2M
25.20 mi13:39:113:11:157:352:49
8:10
#8892
Finish
26.22 mi13:46:383:18:427:357:27
7:19
#8803
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi1006518901890988217871787
10K6.21 mi3.10 mi9999+661839+511839+511003718391839
15K9.32 mi3.11 mi9907+921785+541785+54988217871787
20K12.43 mi3.11 mi9639+2681679+1061679+106898814811481
Half13.11 mi0.68 mi9592+471662+171662+17889114411441
25K15.53 mi2.42 mi9382+2101600+621600+62848613571357
30K18.64 mi3.11 mi9244+1381580+201580+20883416451645
20M20.00 mi1.36 mi9181+631578+21578+2860316361636
21M21.00 mi1.00 mi9060+1211556+221556+22793514941494
35K21.75 mi0.75 mi9078-181577-211577-21972222262226
23M23.00 mi1.25 mi9017+611575+21575+2852718021802
24M24.00 mi1.00 mi8992+251594-191594-19887020322032
40K24.85 mi0.85 mi8931+611586+81586+8812517891789
25.2M25.20 mi0.35 mi8892+391581+51581+5755916291629
Finish26.22 mi1.02 mi8803+891563+181563+18722015131513

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 37%
×21story building
+97ft-345ft

Overall

9882

Females

1787

F18-39

1787

5K→10K

3.1 - 6.2 mi

Top 38%
×5story building
+79ft-138ft

Overall

10037

Females

1839

F18-39

1839

10K→15K

6.2 - 9.3 mi

Top 37%
×3story building
+67ft-78ft

Overall

9882

Females

1787

F18-39

1787

15K→20K

9.3 - 12.4 mi

Top 34%
×5story building
+106ft-86ft

Overall

8988

Females

1481

F18-39

1481

20K→Half

12.4 - 13.1 mi

Top 33%
×2story building
+19ft-37ft

Overall

8891

Females

1441

F18-39

1441

Half→25K

13.1 - 15.5 mi

Top 32%
×4story building
+66ft-88ft

Overall

8486

Females

1357

F18-39

1357

25K→30K

15.5 - 18.6 mi

Top 33%
×9story building
+181ft-148ft

Overall

8834

Females

1645

F18-39

1645

30K→20M

18.6 - 20.0 mi

Top 32%
×5story building
+64ft-50ft

Overall

8603

Females

1636

F18-39

1636

20M→21M

20.0 - 21.0 mi

Top 30%
×8story building
+106ft-24ft

Overall

7935

Females

1494

F18-39

1494

21M→35K

21.0 - 21.8 mi

Top 37%
×7story building
+17ft-86ft

Overall

9722

Females

2226

F18-39

2226

35K→23M

21.8 - 23.0 mi

Top 32%
×5story building
+23ft-63ft

Overall

8527

Females

1802

F18-39

1802

23M→24M

23.0 - 24.0 mi

Top 33%
×6story building
+12ft-82ft

Overall

8870

Females

2032

F18-39

2032

24M→40K

24.0 - 24.9 mi

Top 31%
×1story
+6ft-20ft

Overall

8125

Females

1789

F18-39

1789

40K→25.2M

24.9 - 25.2 mi

Top 28%
×1story
+13ft-16ft

Overall

7559

Females

1629

F18-39

1629

25.2M→Finish

25.2 - 26.2 mi

Top 27%
×2story building
+22ft-21ft

Overall

7220

Females

1513

F18-39

1513

Passing Analysis

Category:
Athletes Passed
1550*
Passed By
446
Net Change
+1104
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 15K----#9907
15K → 20K309*41+268#9907#9639
20K → Half569+47#9639#9592
Half → 25K23727+210#9592#9382
25K → 30K233*95+138#9382#9244
30K → 20M11047+63#9244#9181
20M → 21M14322+121#9181#9060
21M → 35K4159-18#9060#9078
35K → 23M10140+61#9078#9017
23M → 24M8156+25#9017#8992
24M → 40K8221+61#8992#8931
40K → 25.2M445+39#8931#8892
25.2M → Finish11324+89#8892#8803
TOTALS1550*446+1104

* Includes athletes who did not complete a segment (DNF/DNQ).

Passing Charts

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