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BOSTON MARATHON 2025

Cassandra Ostrander

Bib: 28160•F

ME

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

Start
0:00:00
Race begins
5K· 3.11 mi
32:32
Rank: #26689
Start → 5K
10:28/mi
32:32 split
10K· 6.21 mi
1:05:32
Rank: #26581 (+108)
5K → 10K
10:37/mi
33:00 split
15K· 9.32 mi
1:38:21
Rank: #26372 (+209)
10K → 15K
10:34/mi
32:49 split
20K· 12.43 mi
2:10:52
Rank: #26030 (+342)
15K → 20K
10:28/mi
32:31 split
Half· 13.11 mi
2:17:38
Rank: #25951 (+79)
20K → Half
9:55/mi
6:46 split
25K· 15.53 mi
2:44:03
Rank: #25797 (+154)
Half → 25K
10:54/mi
26:25 split
30K· 18.64 mi
3:19:11
Rank: #25564 (+233)
25K → 30K
11:18/mi
35:08 split
20M
3:34:38
Rank: #25474 (+90)
30K → 20M
11:22/mi
15:27 split
21M
3:46:43
Rank: #25390 (+84)
20M → 21M
12:05/mi
12:05 split
35K· 21.75 mi
3:55:03
Rank: #25354 (+36)
21M → 35K
11:08/mi
8:20 split
23M
4:09:53
Rank: #25339 (+15)
35K → 23M
11:51/mi
14:50 split
24M
4:21:16
Rank: #25302 (+37)
23M → 24M
11:23/mi
11:23 split
40K· 24.85 mi
4:30:51
Rank: #25259 (+43)
24M → 40K
11:13/mi
9:35 split
25.2M
4:34:56
Rank: #25242 (+17)
40K → 25.2M
11:50/mi
4:05 split
Finish· 26.22 mi
4:45:15
Rank: #25201 (+41)
25.2M → Finish
10:07/mi
10:19 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:17:38
Pace10:30 /mi
2nd Half
Distance13.11 mi
Time2:27:37
Pace11:16 /mi
📊Positive Split: 7.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:56:2432:3210:2832:32
10:28
-
10K
6.21 mi12:29:241:05:3210:3333:00
10:37
+0:09
15K
9.32 mi13:02:131:38:2110:3332:49
10:34
-0:03
20K
12.43 mi13:34:442:10:5210:3232:31
10:28
-0:06
Half
13.11 mi13:41:302:17:3810:306:46
9:55
-0:33
25K
15.53 mi14:07:552:44:0310:3426:25
10:54
+0:59
30K
18.64 mi14:43:033:19:1110:4135:08
11:18
+0:24
20M
20.00 mi14:58:303:34:3810:4415:27
11:22
+0:04
21M
21.00 mi15:10:353:46:4310:4812:05
12:05
+0:43
35K
21.75 mi15:18:553:55:0310:488:20
11:08
-0:57
23M
23.00 mi15:33:454:09:5310:5214:50
11:51
+0:43
24M
24.00 mi15:45:084:21:1610:5311:23
11:23
-0:28
40K
24.85 mi15:54:434:30:5110:549:35
11:13
-0:10
25.2M
25.20 mi15:58:484:34:5610:554:05
11:50
+0:37
Finish
26.22 mi16:09:074:45:1510:5310:19
10:07
-1:43

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

9:55 /mi

Average Pace

10:53 /mi

Slowest Pace

12:05 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:27:57

52% of race

Time at Steady Pace

1:46:18

37% of race

Time at Slower Pace

31:00

11% of race

Average Pace: 10:53 /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 mi11:56:2432:3210:2832:32
10:28
#26689
10K
6.21 mi12:29:241:05:3210:3333:00
10:37
#26581
15K
9.32 mi13:02:131:38:2110:3332:49
10:34
#26372
20K
12.43 mi13:34:442:10:5210:3232:31
10:28
#26030
Half
13.11 mi13:41:302:17:3810:306:46
9:55
#25951
25K
15.53 mi14:07:552:44:0310:3426:25
10:54
#25797
30K
18.64 mi14:43:033:19:1110:4135:08
11:18
#25564
20M
20.00 mi14:58:303:34:3810:4415:27
11:22
#25474
21M
21.00 mi15:10:353:46:4310:4812:05
12:05
#25390
35K
21.75 mi15:18:553:55:0310:488:20
11:08
#25354
23M
23.00 mi15:33:454:09:5310:5214:50
11:51
#25339
24M
24.00 mi15:45:084:21:1610:5311:23
11:23
#25302
40K
24.85 mi15:54:434:30:5110:549:35
11:13
#25259
25.2M
25.20 mi15:58:484:34:5610:554:05
11:50
#25242
Finish
26.22 mi16:09:074:45:1510:5310:19
10:07
#25201
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi26689111501115026034(Top 92%)10808(Top 88%)10808(Top 198%)
10K6.21 mi3.10 mi26581+10811094+5611094+5626470(Top 93%)11055(Top 90%)11055(Top 202%)
15K9.32 mi3.11 mi26372+20910987+10710987+10726034(Top 92%)10808(Top 88%)10808(Top 198%)
20K12.43 mi3.11 mi26030+34210805+18210805+18225129(Top 88%)10334(Top 85%)10334(Top 189%)
Half13.11 mi0.68 mi25951+7910764+4110764+4124634(Top 87%)10081(Top 82%)10081(Top 184%)
25K15.53 mi2.42 mi25797+15410691+7310691+7325044(Top 88%)10319(Top 84%)10319(Top 189%)
30K18.64 mi3.11 mi25564+23310601+9010601+9024561(Top 86%)10162(Top 83%)10162(Top 186%)
20M20.00 mi1.36 mi25474+9010559+4210559+4224294(Top 86%)10113(Top 83%)10113(Top 185%)
21M21.00 mi1.00 mi25390+8410533+2610533+2623724(Top 84%)9883(Top 81%)9883(Top 181%)
35K21.75 mi0.75 mi25354+3610519+1410519+1424486(Top 86%)10324(Top 84%)10324(Top 189%)
23M23.00 mi1.25 mi25339+1510520-110520-124842(Top 87%)10517(Top 86%)10517(Top 192%)
24M24.00 mi1.00 mi25302+3710508+1210508+1224686(Top 87%)10481(Top 86%)10481(Top 192%)
40K24.85 mi0.85 mi25259+4310494+1410494+1423562(Top 83%)9972(Top 82%)9972(Top 182%)
25.2M25.20 mi0.35 mi25242+1710482+1210482+1222821(Top 80%)9589(Top 78%)9589(Top 175%)
Finish26.22 mi1.02 mi25201+4110470+1210470+1223266(Top 82%)9808(Top 80%)9808(Top 179%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 92%
×21stories
+97ft-345ft

Overall

26034

Females

10808

F18-39

10808

5K→10K

3.1 - 6.2 mi

Top 93%
×5stories
+79ft-138ft

Overall

26470

Females

11055

F18-39

11055

10K→15K

6.2 - 9.3 mi

Top 92%
×3stories
+67ft-78ft

Overall

26034

Females

10808

F18-39

10808

15K→20K

9.3 - 12.4 mi

Top 88%
×5stories
+106ft-86ft

Overall

25129

Females

10334

F18-39

10334

20K→Half

12.4 - 13.1 mi

Top 87%
×2stories
+19ft-37ft

Overall

24634

Females

10081

F18-39

10081

Half→25K

13.1 - 15.5 mi

Top 88%
×4stories
+66ft-88ft

Overall

25044

Females

10319

F18-39

10319

25K→30K

15.5 - 18.6 mi

Top 86%
×9stories
+181ft-148ft

Overall

24561

Females

10162

F18-39

10162

30K→20M

18.6 - 20.0 mi

Top 86%
×5stories
+64ft-50ft

Overall

24294

Females

10113

F18-39

10113

20M→21M

20.0 - 21.0 mi

Top 84%
×8stories
+106ft-24ft

Overall

23724

Females

9883

F18-39

9883

21M→35K

21.0 - 21.8 mi

Top 86%
×7stories
+17ft-86ft

Overall

24486

Females

10324

F18-39

10324

35K→23M

21.8 - 23.0 mi

Top 87%
×5stories
+23ft-63ft

Overall

24842

Females

10517

F18-39

10517

23M→24M

23.0 - 24.0 mi

Top 87%
×6stories
+12ft-82ft

Overall

24686

Females

10481

F18-39

10481

24M→40K

24.0 - 24.9 mi

Top 83%
×1story
+6ft-20ft

Overall

23562

Females

9972

F18-39

9972

40K→25.2M

24.9 - 25.2 mi

Top 80%
×1story
+13ft-16ft

Overall

22821

Females

9589

F18-39

9589

25.2M→Finish

25.2 - 26.2 mi

Top 82%
×2stories
+22ft-21ft

Overall

23266

Females

9808

F18-39

9808

Passing Analysis

Category:
Athletes Passed
1821
Passed By
333
Net Change
+1488
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#26689
5K → 10K235127+108#26689#26581
10K → 15K24334+209#26581#26372
15K → 20K3475+342#26372#26030
20K → Half812+79#26030#25951
Half → 25K18127+154#25951#25797
25K → 30K25926+233#25797#25564
30K → 20M10414+90#25564#25474
20M → 21M9511+84#25474#25390
21M → 35K4913+36#25390#25354
35K → 23M4732+15#25354#25339
23M → 24M5720+37#25339#25302
24M → 40K518+43#25302#25259
40K → 25.2M236+17#25259#25242
25.2M → Finish498+41#25242#25201
TOTALS1821333+1488
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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