Boston Marathon logo
BOSTON MARATHON 2023

Alison Reifenberg

Bib: 12544•F

IL

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 38%
Gender (Female)
#0 / 11423
Top 18%
Division (F18-39)
#0 / 4884
Top 32%
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
7:46/mi
24:09
↑ 97↓ 3451.5%
10K· 6.21 mi
7:32/mi
47:34
↑ 79↓ 1380.4%
15K· 9.32 mi
7:30/mi
1:10:53
↑ 67↓ 78
20K· 12.43 mi
7:34/mi
1:34:23
↑ 106↓ 860.1%
Half· 13.11 mi
7:26/mi
1:39:27
↑ 19↓ 370.5%
25K· 15.53 mi
7:37/mi
1:57:54
↑ 66↓ 880.2%
30K· 18.64 mi
7:53/mi
2:22:23
↑ 181↓ 1480.2%
20M
7:52/mi
2:33:05
↑ 64↓ 500.2%
21M
8:24/mi
2:41:29
↑ 106↓ 241.6%
35K· 21.75 mi
7:33/mi
2:47:08
↑ 17↓ 861.7%
23M
7:53/mi
2:57:00
↑ 23↓ 630.6%
24M
7:46/mi
3:04:46
↓ 821.3%
40K· 24.85 mi
8:03/mi
3:11:39
↓ 200.3%
25.2M
8:51/mi
3:14:42
↑ 13↓ 160.2%
Finish· 26.22 mi
7:59/mi
3:22:50
↑ 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
Time1:39:27
Pace7:35 /mi
2nd Half
Distance13.11 mi
Time1:43:23
Pace7:53 /mi
📊Positive Split: 4.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:1124:097:4624:09
7:46
-
10K
6.21 mi11:15:3647:347:3923:25
7:32
-0:14
15K
9.32 mi11:38:551:10:537:3623:19
7:30
-0:02
20K
12.43 mi12:02:251:34:237:3623:30
7:34
+0:04
Half
13.11 mi12:07:291:39:277:355:04
7:26
-0:08
25K
15.53 mi12:25:561:57:547:3518:27
7:37
+0:11
30K
18.64 mi12:50:252:22:237:3824:29
7:53
+0:16
20M
20.00 mi13:01:072:33:057:3910:42
7:52
-0:01
21M
21.00 mi13:09:312:41:297:418:24
8:24
+0:32
35K
21.75 mi13:15:102:47:087:415:39
7:33
-0:51
23M
23.00 mi13:25:022:57:007:429:52
7:53
+0:20
24M
24.00 mi13:32:483:04:467:427:46
7:46
-0:07
40K
24.85 mi13:39:413:11:397:436:53
8:03
+0:17
25.2M
25.20 mi13:42:443:14:427:443:03
8:51
+0:48
Finish
26.22 mi13:50:523:22:507:458:08
7:59
-0:52

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

7:26 /mi

Average Pace

7:45 /mi

Slowest Pace

8:51 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:11:23

94% of race

Time at Steady Pace

8:24

4% of race

Time at Slower Pace

3:03

2% of race

Average Pace: 7:44 /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 mi10:52:1124:097:4624:09
7:46
#12118
10K
6.21 mi11:15:3647:347:3923:25
7:32
#11394
15K
9.32 mi11:38:551:10:537:3623:19
7:30
#10965
20K
12.43 mi12:02:251:34:237:3623:30
7:34
#10665
Half
13.11 mi12:07:291:39:277:355:04
7:26
#10600
25K
15.53 mi12:25:561:57:547:3518:27
7:37
#10402
30K
18.64 mi12:50:252:22:237:3824:29
7:53
#10284
20M
20.00 mi13:01:072:33:057:3910:42
7:52
#10197
21M
21.00 mi13:09:312:41:297:418:24
8:24
#10139
35K
21.75 mi13:15:102:47:087:415:39
7:33
#10068
23M
23.00 mi13:25:022:57:007:429:52
7:53
#9970
24M
24.00 mi13:32:483:04:467:427:46
7:46
#9929
40K
24.85 mi13:39:413:11:397:436:53
8:03
#9920
25.2M
25.20 mi13:42:443:14:427:443:03
8:51
#9937
Finish
26.22 mi13:50:523:22:507:458:08
7:59
#10003
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi121182931293110228(Top 38%)1949(Top 17%)1949(Top 40%)
10K6.21 mi3.10 mi11394+7242541+3902541+39010793(Top 41%)2199(Top 19%)2199(Top 45%)
15K9.32 mi3.11 mi10965+4292316+2252316+22510228(Top 38%)1949(Top 17%)1949(Top 40%)
20K12.43 mi3.11 mi10665+3002165+1512165+1519825(Top 37%)1835(Top 16%)1835(Top 38%)
Half13.11 mi0.68 mi10600+652122+432122+439687(Top 36%)1758(Top 15%)1758(Top 36%)
25K15.53 mi2.42 mi10402+1982045+772045+779640(Top 36%)1843(Top 16%)1843(Top 38%)
30K18.64 mi3.11 mi10284+1182044+12044+19989(Top 38%)2156(Top 19%)2156(Top 44%)
20M20.00 mi1.36 mi10197+872023+212023+219418(Top 35%)1986(Top 17%)1986(Top 41%)
21M21.00 mi1.00 mi10139+582011+122011+129877(Top 37%)2323(Top 20%)2323(Top 48%)
35K21.75 mi0.75 mi10068+712000+112000+118973(Top 34%)1910(Top 17%)1910(Top 39%)
23M23.00 mi1.25 mi9970+981973+271973+278967(Top 34%)2011(Top 18%)2011(Top 41%)
24M24.00 mi1.00 mi9929+411997-241997-249548(Top 36%)2358(Top 21%)2358(Top 48%)
40K24.85 mi0.85 mi9920+92025-282025-2810387(Top 39%)2829(Top 25%)2829(Top 58%)
25.2M25.20 mi0.35 mi9937-172051-262051-2611594(Top 44%)3490(Top 31%)3490(Top 71%)
Finish26.22 mi1.02 mi10003-662096-452096-4511998(Top 45%)3696(Top 32%)3696(Top 76%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 38%
×21story building
+97ft-345ft

Overall

10228

Females

1949

F18-39

1949

5K→10K

3.1 - 6.2 mi

Top 41%
×5story building
+79ft-138ft

Overall

10793

Females

2199

F18-39

2199

10K→15K

6.2 - 9.3 mi

Top 38%
×3story building
+67ft-78ft

Overall

10228

Females

1949

F18-39

1949

15K→20K

9.3 - 12.4 mi

Top 37%
×5story building
+106ft-86ft

Overall

9825

Females

1835

F18-39

1835

20K→Half

12.4 - 13.1 mi

Top 36%
×2story building
+19ft-37ft

Overall

9687

Females

1758

F18-39

1758

Half→25K

13.1 - 15.5 mi

Top 36%
×4story building
+66ft-88ft

Overall

9640

Females

1843

F18-39

1843

25K→30K

15.5 - 18.6 mi

Top 38%
×9story building
+181ft-148ft

Overall

9989

Females

2156

F18-39

2156

30K→20M

18.6 - 20.0 mi

Top 35%
×5story building
+64ft-50ft

Overall

9418

Females

1986

F18-39

1986

20M→21M

20.0 - 21.0 mi

Top 37%
×8story building
+106ft-24ft

Overall

9877

Females

2323

F18-39

2323

21M→35K

21.0 - 21.8 mi

Top 34%
×7story building
+17ft-86ft

Overall

8973

Females

1910

F18-39

1910

35K→23M

21.8 - 23.0 mi

Top 34%
×5story building
+23ft-63ft

Overall

8967

Females

2011

F18-39

2011

23M→24M

23.0 - 24.0 mi

Top 36%
×6story building
+12ft-82ft

Overall

9548

Females

2358

F18-39

2358

24M→40K

24.0 - 24.9 mi

Top 39%
×1story
+6ft-20ft

Overall

10387

Females

2829

F18-39

2829

40K→25.2M

24.9 - 25.2 mi

Top 44%
×1story
+13ft-16ft

Overall

11594

Females

3490

F18-39

3490

25.2M→Finish

25.2 - 26.2 mi

Top 45%
×2story building
+22ft-21ft

Overall

11998

Females

3696

F18-39

3696

Passing Analysis

Category:
Athletes Passed
2821*
Passed By
704
Net Change
+2115
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12118
5K → 10K80682+724#12118#11394
10K → 15K47041+429#11394#10965
15K → 20K34242+300#10965#10665
20K → Half727+65#10665#10600
Half → 25K23840+198#10600#10402
25K → 30K20688+118#10402#10284
30K → 20M122*35+87#10284#10197
20M → 21M11355+58#10197#10139
21M → 35K8312+71#10139#10068
35K → 23M123*25+98#10068#9970
23M → 24M9654+41#9970#9929
24M → 40K7566+9#9929#9920
40K → 25.2M2441-17#9920#9937
25.2M → Finish51116-66#9937#10003
TOTALS2821*704+2115

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

📊

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