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BOSTON MARATHON 2025

Samantha Riordan

Bib: 27921•F

CT

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

⏱️ 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
9:10/mi
28:29
↑ 97↓ 3451.5%
10K· 6.21 mi
8:55/mi
56:11
↑ 79↓ 1380.4%
15K· 9.32 mi
8:58/mi
1:24:02
↑ 67↓ 78
20K· 12.43 mi
9:05/mi
1:52:14
↑ 106↓ 860.1%
Half· 13.11 mi
8:39/mi
1:58:08
↑ 19↓ 370.5%
25K· 15.53 mi
8:53/mi
2:19:41
↑ 66↓ 880.2%
30K· 18.64 mi
9:11/mi
2:48:13
↑ 181↓ 1480.2%
20M
9:15/mi
3:00:47
↑ 64↓ 500.2%
21M
9:30/mi
3:10:17
↑ 106↓ 241.6%
35K· 21.75 mi
9:29/mi
3:17:23
↑ 17↓ 861.7%
23M
9:43/mi
3:29:33
↑ 23↓ 630.6%
24M
9:41/mi
3:39:14
↓ 821.3%
40K· 24.85 mi
10:07/mi
3:47:53
↓ 200.3%
25.2M
9:52/mi
3:51:17
↑ 13↓ 160.2%
Finish· 26.22 mi
8:34/mi
4:00:01
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:58:08
Pace9:01 /mi
2nd Half
Distance13.11 mi
Time2:01:53
Pace9:18 /mi
📊Positive Split: 3.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:45:0728:299:1028:29
9:10
-
10K
6.21 mi12:12:4956:119:0327:42
8:55
-0:15
15K
9.32 mi12:40:401:24:029:0127:51
8:58
+0:03
20K
12.43 mi13:08:521:52:149:0228:12
9:05
+0:07
Half
13.11 mi13:14:461:58:089:015:54
8:39
-0:26
25K
15.53 mi13:36:192:19:419:0021:33
8:53
+0:14
30K
18.64 mi14:04:512:48:139:0128:32
9:11
+0:18
20M
20.00 mi14:17:253:00:479:0212:34
9:15
+0:04
21M
21.00 mi14:26:553:10:179:049:30
9:30
+0:15
35K
21.75 mi14:34:013:17:239:057:06
9:29
-0:01
23M
23.00 mi14:46:113:29:339:0712:10
9:43
+0:14
24M
24.00 mi14:55:523:39:149:089:41
9:41
-0:02
40K
24.85 mi15:04:313:47:539:108:39
10:07
+0:26
25.2M
25.20 mi15:07:553:51:179:113:24
9:52
-0:15
Finish
26.22 mi15:16:394:00:019:108:44
8:34
-1:18

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

8:34 /mi

Average Pace

9:10 /mi

Slowest Pace

10:07 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:09:31

79% of race

Time at Steady Pace

41:51

17% of race

Time at Slower Pace

8:39

4% of race

Average Pace: 9:09 /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 mi11:45:0728:299:1028:29
9:10
#23104
10K
6.21 mi12:12:4956:119:0327:42
8:55
#22588
15K
9.32 mi12:40:401:24:029:0127:51
8:58
#22341
20K
12.43 mi13:08:521:52:149:0228:12
9:05
#22068
Half
13.11 mi13:14:461:58:089:015:54
8:39
#21977
25K
15.53 mi13:36:192:19:419:0021:33
8:53
#21515
30K
18.64 mi14:04:512:48:139:0128:32
9:11
#20989
20M
20.00 mi14:17:253:00:479:0212:34
9:15
#20752
21M
21.00 mi14:26:553:10:179:049:30
9:30
#20485
35K
21.75 mi14:34:013:17:239:057:06
9:29
#20481
23M
23.00 mi14:46:113:29:339:0712:10
9:43
#20426
24M
24.00 mi14:55:523:39:149:089:41
9:41
#20452
40K
24.85 mi15:04:313:47:539:108:39
10:07
#20487
25.2M
25.20 mi15:07:553:51:179:113:24
9:52
#20454
Finish
26.22 mi15:16:394:00:019:108:44
8:34
#20354
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi231049225922521871(Top 77%)8471(Top 69%)8471(Top 155%)
10K6.21 mi3.10 mi22588+5168931+2948931+29422012(Top 77%)8601(Top 70%)8601(Top 157%)
15K9.32 mi3.11 mi22341+2478774+1578774+15721871(Top 77%)8471(Top 69%)8471(Top 155%)
20K12.43 mi3.11 mi22068+2738634+1408634+14021353(Top 75%)8231(Top 67%)8231(Top 151%)
Half13.11 mi0.68 mi21977+918582+528582+5220111(Top 71%)7551(Top 62%)7551(Top 138%)
25K15.53 mi2.42 mi21515+4628331+2518331+25119389(Top 68%)7202(Top 59%)7202(Top 132%)
30K18.64 mi3.11 mi20989+5268085+2468085+24618593(Top 65%)6890(Top 56%)6890(Top 126%)
20M20.00 mi1.36 mi20752+2377970+1157970+11518060(Top 64%)6755(Top 55%)6755(Top 124%)
21M21.00 mi1.00 mi20485+2677846+1247846+12416125(Top 57%)5784(Top 47%)5784(Top 106%)
35K21.75 mi0.75 mi20481+47856-107856-1020316(Top 72%)8140(Top 67%)8140(Top 149%)
23M23.00 mi1.25 mi20426+557849+77849+719524(Top 69%)7802(Top 64%)7802(Top 143%)
24M24.00 mi1.00 mi20452-267876-277876-2720331(Top 72%)8257(Top 68%)8257(Top 151%)
40K24.85 mi0.85 mi20487-357913-377913-3720843(Top 73%)8578(Top 70%)8578(Top 157%)
25.2M25.20 mi0.35 mi20454+337907+67907+616486(Top 58%)6347(Top 52%)6347(Top 116%)
Finish26.22 mi1.02 mi20354+1007866+417866+4116714(Top 59%)6419(Top 52%)6419(Top 117%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 77%
×21story building
+97ft-345ft

Overall

21871

Females

8471

F18-39

8471

5K→10K

3.1 - 6.2 mi

Top 77%
×5story building
+79ft-138ft

Overall

22012

Females

8601

F18-39

8601

10K→15K

6.2 - 9.3 mi

Top 77%
×3story building
+67ft-78ft

Overall

21871

Females

8471

F18-39

8471

15K→20K

9.3 - 12.4 mi

Top 75%
×5story building
+106ft-86ft

Overall

21353

Females

8231

F18-39

8231

20K→Half

12.4 - 13.1 mi

Top 71%
×2story building
+19ft-37ft

Overall

20111

Females

7551

F18-39

7551

Half→25K

13.1 - 15.5 mi

Top 68%
×4story building
+66ft-88ft

Overall

19389

Females

7202

F18-39

7202

25K→30K

15.5 - 18.6 mi

Top 65%
×9story building
+181ft-148ft

Overall

18593

Females

6890

F18-39

6890

30K→20M

18.6 - 20.0 mi

Top 64%
×5story building
+64ft-50ft

Overall

18060

Females

6755

F18-39

6755

20M→21M

20.0 - 21.0 mi

Top 57%
×8story building
+106ft-24ft

Overall

16125

Females

5784

F18-39

5784

21M→35K

21.0 - 21.8 mi

Top 72%
×7story building
+17ft-86ft

Overall

20316

Females

8140

F18-39

8140

35K→23M

21.8 - 23.0 mi

Top 69%
×5story building
+23ft-63ft

Overall

19524

Females

7802

F18-39

7802

23M→24M

23.0 - 24.0 mi

Top 72%
×6story building
+12ft-82ft

Overall

20331

Females

8257

F18-39

8257

24M→40K

24.0 - 24.9 mi

Top 73%
×1story
+6ft-20ft

Overall

20843

Females

8578

F18-39

8578

40K→25.2M

24.9 - 25.2 mi

Top 58%
×1story
+13ft-16ft

Overall

16486

Females

6347

F18-39

6347

25.2M→Finish

25.2 - 26.2 mi

Top 59%
×2story building
+22ft-21ft

Overall

16714

Females

6419

F18-39

6419

Passing Analysis

Category:
Athletes Passed
3239
Passed By
489
Net Change
+2750
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23104
5K → 10K57155+516#23104#22588
10K → 15K32275+247#22588#22341
15K → 20K32047+273#22341#22068
20K → Half910+91#22068#21977
Half → 25K4675+462#21977#21515
25K → 30K5348+526#21515#20989
30K → 20M24811+237#20989#20752
20M → 21M2714+267#20752#20485
21M → 35K5652+4#20485#20481
35K → 23M11055+55#20481#20426
23M → 24M4571-26#20426#20452
24M → 40K4984-35#20452#20487
40K → 25.2M429+33#20487#20454
25.2M → Finish11313+100#20454#20354
TOTALS3239489+2750
📊

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