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BOSTON MARATHON 2025

Shannon Ahern

Bib: 13160•F

NY

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 27%
Gender (Female)
#0 / 12228
Top 10%
Division (F18-39)
#0 / 5469
Top 19%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:06
Rank: #11662
Start → 5K
7:26/mi
23:06 split
10K· 6.21 mi
46:18
Rank: #11711 (-49)
5K → 10K
7:28/mi
23:12 split
15K· 9.32 mi
1:09:25
Rank: #11513 (+198)
10K → 15K
7:26/mi
23:07 split
20K· 12.43 mi
1:32:32
Rank: #11182 (+331)
15K → 20K
7:26/mi
23:07 split
Half· 13.11 mi
1:37:34
Rank: #11167 (+15)
20K → Half
7:23/mi
5:02 split
25K· 15.53 mi
1:55:24
Rank: #10684 (+483)
Half → 25K
7:21/mi
17:50 split
30K· 18.64 mi
2:18:39
Rank: #10031 (+653)
25K → 30K
7:29/mi
23:15 split
20M
2:28:41
Rank: #9668 (+363)
30K → 20M
7:23/mi
10:02 split
21M
2:36:10
Rank: #9279 (+389)
20M → 21M
7:29/mi
7:29 split
35K· 21.75 mi
2:41:15
Rank: #9049 (+230)
21M → 35K
6:48/mi
5:05 split
23M
2:50:08
Rank: #8616 (+433)
35K → 23M
7:06/mi
8:53 split
24M
2:57:17
Rank: #8389 (+227)
23M → 24M
7:09/mi
7:09 split
40K· 24.85 mi
3:03:21
Rank: #8185 (+204)
24M → 40K
7:06/mi
6:04 split
25.2M
3:05:56
Rank: #8087 (+98)
40K → 25.2M
7:29/mi
2:35 split
Finish· 26.22 mi
3:12:33
Rank: #7760 (+327)
25.2M → Finish
6:30/mi
6:37 split

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time1:37:34
Pace7:27 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:34:59
Pace7:15 /mi
📊Negative Split: 2.6% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:2623:067:2623:06
7:26
-
10K
6.21 mi11:15:3846:187:2723:12
7:28
+0:02
15K
9.32 mi11:38:451:09:257:2723:07
7:26
-0:02
20K
12.43 mi12:01:521:32:327:2723:07
7:26
0:00
Half
13.11 mi12:06:541:37:347:275:02
7:23
-0:03
25K
15.53 mi12:24:441:55:247:2617:50
7:21
-0:02
30K
18.64 mi12:47:592:18:397:2623:15
7:29
+0:08
20M
20.00 mi12:58:012:28:417:2610:02
7:23
-0:06
21M
21.00 mi13:05:302:36:107:267:29
7:29
+0:06
35K
21.75 mi13:10:352:41:157:255:05
6:48
-0:41
23M
23.00 mi13:19:282:50:087:248:53
7:06
+0:18
24M
24.00 mi13:26:372:57:177:237:09
7:09
+0:03
40K
24.85 mi13:32:413:03:217:236:04
7:06
-0:03
25.2M
25.20 mi13:35:163:05:567:232:35
7:29
+0:23
Finish
26.22 mi13:41:533:12:337:216:37
6:30
-0:59

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

6:30 /mi

Average Pace

7:21 /mi

Slowest Pace

7:29 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

26:39

14% of race

Time at Steady Pace

2:45:54

86% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:21 /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 mi10:52:2623:067:2623:06
7:26
#11662
10K
6.21 mi11:15:3846:187:2723:12
7:28
#11711
15K
9.32 mi11:38:451:09:257:2723:07
7:26
#11513
20K
12.43 mi12:01:521:32:327:2723:07
7:26
#11182
Half
13.11 mi12:06:541:37:347:275:02
7:23
#11167
25K
15.53 mi12:24:441:55:247:2617:50
7:21
#10684
30K
18.64 mi12:47:592:18:397:2623:15
7:29
#10031
20M
20.00 mi12:58:012:28:417:2610:02
7:23
#9668
21M
21.00 mi13:05:302:36:107:267:29
7:29
#9279
35K
21.75 mi13:10:352:41:157:255:05
6:48
#9049
23M
23.00 mi13:19:282:50:087:248:53
7:06
#8616
24M
24.00 mi13:26:372:57:177:237:09
7:09
#8389
40K
24.85 mi13:32:413:03:217:236:04
7:06
#8185
25.2M
25.20 mi13:35:163:05:567:232:35
7:29
#8087
Finish
26.22 mi13:41:533:12:337:216:37
6:30
#7760
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi116622608260811242(Top 40%)2491(Top 20%)2491(Top 46%)
10K6.21 mi3.10 mi11711-492649-412649-4111788(Top 42%)2702(Top 22%)2702(Top 49%)
15K9.32 mi3.11 mi11513+1982585+642585+6411242(Top 40%)2491(Top 20%)2491(Top 46%)
20K12.43 mi3.11 mi11182+3312442+1432442+14310254(Top 36%)2081(Top 17%)2081(Top 38%)
Half13.11 mi0.68 mi11167+152436+62436+610685(Top 38%)2250(Top 18%)2250(Top 41%)
25K15.53 mi2.42 mi10684+4832221+2152221+2158792(Top 31%)1543(Top 13%)1543(Top 28%)
30K18.64 mi3.11 mi10031+6531968+2531968+2537647(Top 27%)1250(Top 10%)1250(Top 23%)
20M20.00 mi1.36 mi9668+3631843+1251843+1256319(Top 22%)898(Top 7%)898(Top 16%)
21M21.00 mi1.00 mi9279+3891700+1431700+1434577(Top 16%)513(Top 4%)513(Top 9%)
35K21.75 mi0.75 mi9049+2301613+871613+874144(Top 15%)433(Top 4%)433(Top 8%)
23M23.00 mi1.25 mi8616+4331477+1361477+1364340(Top 15%)496(Top 4%)496(Top 9%)
24M24.00 mi1.00 mi8389+2271425+521425+525552(Top 20%)910(Top 7%)910(Top 17%)
40K24.85 mi0.85 mi8185+2041372+531372+534499(Top 16%)646(Top 5%)646(Top 12%)
25.2M25.20 mi0.35 mi8087+981349+231349+233467(Top 12%)434(Top 4%)434(Top 8%)
Finish26.22 mi1.02 mi7760+3271261+881261+882829(Top 10%)293(Top 2%)293(Top 5%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 40%
×21story building
+97ft-345ft

Overall

11242

Females

2491

F18-39

2491

5K→10K

3.1 - 6.2 mi

Top 42%
×5story building
+79ft-138ft

Overall

11788

Females

2702

F18-39

2702

10K→15K

6.2 - 9.3 mi

Top 40%
×3story building
+67ft-78ft

Overall

11242

Females

2491

F18-39

2491

15K→20K

9.3 - 12.4 mi

Top 36%
×5story building
+106ft-86ft

Overall

10254

Females

2081

F18-39

2081

20K→Half

12.4 - 13.1 mi

Top 38%
×2story building
+19ft-37ft

Overall

10685

Females

2250

F18-39

2250

Half→25K

13.1 - 15.5 mi

Top 31%
×4story building
+66ft-88ft

Overall

8792

Females

1543

F18-39

1543

25K→30K

15.5 - 18.6 mi

Top 27%
×9story building
+181ft-148ft

Overall

7647

Females

1250

F18-39

1250

30K→20M

18.6 - 20.0 mi

Top 22%
×5story building
+64ft-50ft

Overall

6319

Females

898

F18-39

898

20M→21M

20.0 - 21.0 mi

Top 16%
×8story building
+106ft-24ft

Overall

4577

Females

513

F18-39

513

21M→35K

21.0 - 21.8 mi

Top 15%
×7story building
+17ft-86ft

Overall

4144

Females

433

F18-39

433

35K→23M

21.8 - 23.0 mi

Top 15%
×5story building
+23ft-63ft

Overall

4340

Females

496

F18-39

496

23M→24M

23.0 - 24.0 mi

Top 20%
×6story building
+12ft-82ft

Overall

5552

Females

910

F18-39

910

24M→40K

24.0 - 24.9 mi

Top 16%
×1story
+6ft-20ft

Overall

4499

Females

646

F18-39

646

40K→25.2M

24.9 - 25.2 mi

Top 12%
×1story
+13ft-16ft

Overall

3467

Females

434

F18-39

434

25.2M→Finish

25.2 - 26.2 mi

Top 10%
×2story building
+22ft-21ft

Overall

2829

Females

293

F18-39

293

Passing Analysis

Category:
Athletes Passed
4358*
Passed By
456
Net Change
+3902
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11662
5K → 10K222271-49#11662#11711
10K → 15K28284+198#11711#11513
15K → 20K38150+331#11513#11182
20K → Half4429+15#11182#11167
Half → 25K4874+483#11167#10684
25K → 30K661*8+653#10684#10031
30K → 20M3641+363#10031#9668
20M → 21M3890+389#9668#9279
21M → 35K2300+230#9279#9049
35K → 23M4341+433#9049#8616
23M → 24M2314+227#8616#8389
24M → 40K2062+204#8389#8185
40K → 25.2M1002+98#8185#8087
25.2M → Finish3270+327#8087#7760
TOTALS4358*456+3902

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

📊

Passing Visuals

Category:
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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing