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BOSTON MARATHON 2025

Aimee Simpson

Bib: 20688•F

WI

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F40-44)
#0 / 1718
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
8:25/mi
26:08
↑ 97↓ 3451.5%
10K· 6.21 mi
8:21/mi
52:03
↑ 79↓ 1380.4%
15K· 9.32 mi
8:45/mi
1:19:14
↑ 67↓ 78
20K· 12.43 mi
9:57/mi
1:50:09
↑ 106↓ 860.1%
Half· 13.11 mi
8:39/mi
1:56:03
↑ 19↓ 370.5%
25K· 15.53 mi
10:02/mi
2:20:23
↑ 66↓ 880.2%
30K· 18.64 mi
10:05/mi
2:51:43
↑ 181↓ 1480.2%
20M
10:59/mi
3:06:39
↑ 64↓ 500.2%
21M
14:52/mi
3:21:31
↑ 106↓ 241.6%
35K· 21.75 mi
9:41/mi
3:28:46
↑ 17↓ 861.7%
23M
10:43/mi
3:42:11
↑ 23↓ 630.6%
24M
10:43/mi
3:52:53
↓ 821.3%
40K· 24.85 mi
10:43/mi
4:02:03
↓ 200.3%
25.2M
12:14/mi
4:06:16
↑ 13↓ 160.2%
Finish· 26.22 mi
9:22/mi
4:15:49
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:56:03
Pace8:51 /mi
2nd Half
Distance13.11 mi
Time2:19:46
Pace10:40 /mi
📊Positive Split: 20.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:42:2826:088:2526:08
8:25
-
10K
6.21 mi12:08:2352:038:2325:55
8:21
-0:04
15K
9.32 mi12:35:341:19:148:3027:11
8:45
+0:24
20K
12.43 mi13:06:291:50:098:5230:55
9:57
+1:12
Half
13.11 mi13:12:231:56:038:515:54
8:39
-1:18
25K
15.53 mi13:36:432:20:239:0224:20
10:02
+1:23
30K
18.64 mi14:08:032:51:439:1331:20
10:05
+0:03
20M
20.00 mi14:22:593:06:399:2014:56
10:59
+0:54
21M
21.00 mi14:37:513:21:319:3614:52
14:52
+3:53
35K
21.75 mi14:45:063:28:469:367:15
9:41
-5:11
23M
23.00 mi14:58:313:42:119:4013:25
10:43
+1:02
24M
24.00 mi15:09:133:52:539:4210:42
10:43
0:00
40K
24.85 mi15:18:234:02:039:449:10
10:43
0:00
25.2M
25.20 mi15:22:364:06:169:464:13
12:14
+1:31
Finish
26.22 mi15:32:094:15:499:469:33
9:22
-2:52

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

8:21 /mi

Average Pace

9:46 /mi

Slowest Pace

14:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:25:08

33% of race

Time at Steady Pace

2:16:40

53% of race

Time at Slower Pace

34:01

13% of race

Average Pace: 9:45 /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 mi11:42:2826:088:2526:08
8:25
#19395
10K
6.21 mi12:08:2352:038:2325:55
8:21
#19112
15K
9.32 mi12:35:341:19:148:3027:11
8:45
#19661
20K
12.43 mi13:06:291:50:098:5230:55
9:57
#21239
Half
13.11 mi13:12:231:56:038:515:54
8:39
#21190
25K
15.53 mi13:36:432:20:239:0224:20
10:02
#21731
30K
18.64 mi14:08:032:51:439:1331:20
10:05
#21815
20M
20.00 mi14:22:593:06:399:2014:56
10:59
#22012
21M
21.00 mi14:37:513:21:319:3614:52
14:52
#22552
35K
21.75 mi14:45:063:28:469:367:15
9:41
#22483
23M
23.00 mi14:58:313:42:119:4013:25
10:43
#22480
24M
24.00 mi15:09:133:52:539:4210:42
10:43
#22504
40K
24.85 mi15:18:234:02:039:449:10
10:43
#22492
25.2M
25.20 mi15:22:364:06:169:464:13
12:14
#22522
Finish
26.22 mi15:32:094:15:499:469:33
9:22
#22456
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi193957142714220771(Top 73%)7872(Top 64%)7872(Top 458%)
10K6.21 mi3.10 mi19112+2836967+1756967+17518841(Top 66%)6791(Top 56%)6791(Top 395%)
15K9.32 mi3.11 mi19661-5497271-3047271-30420771(Top 73%)7872(Top 64%)7872(Top 458%)
20K12.43 mi3.11 mi21239-15788164-8938164-89324127(Top 85%)9781(Top 80%)9781(Top 569%)
Half13.11 mi0.68 mi21190+498134+308134+3020132(Top 71%)7572(Top 62%)7572(Top 441%)
25K15.53 mi2.42 mi21731-5418462-3288462-32823354(Top 82%)9394(Top 77%)9394(Top 547%)
30K18.64 mi3.11 mi21815-848520-588520-5821851(Top 77%)8699(Top 71%)8699(Top 506%)
20M20.00 mi1.36 mi22012-1978646-1268646-12623560(Top 83%)9716(Top 79%)9716(Top 566%)
21M21.00 mi1.00 mi22552-5408974-3288974-32827049(Top 95%)11590(Top 95%)11590(Top 675%)
35K21.75 mi0.75 mi22483+698953+218953+2121011(Top 74%)8515(Top 70%)8515(Top 496%)
23M23.00 mi1.25 mi22480+38977-248977-2422538(Top 79%)9365(Top 77%)9365(Top 545%)
24M24.00 mi1.00 mi22504-249015-389015-3823330(Top 82%)9798(Top 80%)9798(Top 570%)
40K24.85 mi0.85 mi22492+129029-149029-1422513(Top 79%)9464(Top 77%)9464(Top 551%)
25.2M25.20 mi0.35 mi22522-309044-159044-1523677(Top 83%)10009(Top 82%)10009(Top 583%)
Finish26.22 mi1.02 mi22456+669033+119033+1120703(Top 73%)8508(Top 70%)8508(Top 495%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 73%
×21story building
+97ft-345ft

Overall

20771

Females

7872

F40-44

7872

5K→10K

3.1 - 6.2 mi

Top 66%
×5story building
+79ft-138ft

Overall

18841

Females

6791

F40-44

6791

10K→15K

6.2 - 9.3 mi

Top 73%
×3story building
+67ft-78ft

Overall

20771

Females

7872

F40-44

7872

15K→20K

9.3 - 12.4 mi

Top 85%
×5story building
+106ft-86ft

Overall

24127

Females

9781

F40-44

9781

20K→Half

12.4 - 13.1 mi

Top 71%
×2story building
+19ft-37ft

Overall

20132

Females

7572

F40-44

7572

Half→25K

13.1 - 15.5 mi

Top 82%
×4story building
+66ft-88ft

Overall

23354

Females

9394

F40-44

9394

25K→30K

15.5 - 18.6 mi

Top 77%
×9story building
+181ft-148ft

Overall

21851

Females

8699

F40-44

8699

30K→20M

18.6 - 20.0 mi

Top 83%
×5story building
+64ft-50ft

Overall

23560

Females

9716

F40-44

9716

20M→21M

20.0 - 21.0 mi

Top 95%
×8story building
+106ft-24ft

Overall

27049

Females

11590

F40-44

11590

21M→35K

21.0 - 21.8 mi

Top 74%
×7story building
+17ft-86ft

Overall

21011

Females

8515

F40-44

8515

35K→23M

21.8 - 23.0 mi

Top 79%
×5story building
+23ft-63ft

Overall

22538

Females

9365

F40-44

9365

23M→24M

23.0 - 24.0 mi

Top 82%
×6story building
+12ft-82ft

Overall

23330

Females

9798

F40-44

9798

24M→40K

24.0 - 24.9 mi

Top 79%
×1story
+6ft-20ft

Overall

22513

Females

9464

F40-44

9464

40K→25.2M

24.9 - 25.2 mi

Top 83%
×1story
+13ft-16ft

Overall

23677

Females

10009

F40-44

10009

25.2M→Finish

25.2 - 26.2 mi

Top 73%
×2story building
+22ft-21ft

Overall

20703

Females

8508

F40-44

8508

Passing Analysis

Category:
Athletes Passed
1184
Passed By
4245
Net Change
-3061
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19395
5K → 10K427144+283#19395#19112
10K → 15K62611-549#19112#19661
15K → 20K231601-1578#19661#21239
20K → Half6112+49#21239#21190
Half → 25K41582-541#21190#21731
25K → 30K168252-84#21731#21815
30K → 20M45242-197#21815#22012
20M → 21M10550-540#22012#22552
21M → 35K8415+69#22552#22483
35K → 23M7572+3#22483#22480
23M → 24M4367-24#22480#22504
24M → 40K5240+12#22504#22492
40K → 25.2M939-30#22492#22522
25.2M → Finish8418+66#22522#22456
TOTALS11844245-3061
📊

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