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BOSTON MARATHON 2025

Chelsea Cook

Bib: 18840•F

NH

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 45%
Masters (Masters Women)
#0 / 6759
Top 32%
Division (F40-44)
#0 / 1718
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:04
Rank: #17147
Start → 5K
25:04 | 8:04/mi
10K· 6.21 mi
50:32
Rank: #17509 (-362)
5K → 10K
25:28 | 8:12/mi
15K· 9.32 mi
1:16:20
Rank: #17696 (-187)
10K → 15K
25:48 | 8:18/mi
20K· 12.43 mi
1:42:19
Rank: #17572 (+124)
15K → 20K
25:59 | 8:22/mi
Half· 13.11 mi
1:47:56
Rank: #17564 (+8)
20K → Half
5:37 | 8:14/mi
25K· 15.53 mi
2:08:42
Rank: #17505 (+59)
Half → 25K
20:46 | 8:34/mi
30K· 18.64 mi
2:35:26
Rank: #17073 (+432)
25K → 30K
26:44 | 8:36/mi
20M
2:47:19
Rank: #16924 (+149)
30K → 20M
11:53 | 8:45/mi
21M
2:56:30
Rank: #16738 (+186)
20M → 21M
9:11 | 9:11/mi
35K· 21.75 mi
3:02:41
Rank: #16617 (+121)
21M → 35K
6:11 | 8:16/mi
23M
3:13:36
Rank: #16448 (+169)
35K → 23M
10:55 | 8:43/mi
24M
3:22:12
Rank: #16379 (+69)
23M → 24M
8:36 | 8:36/mi
40K· 24.85 mi
3:29:14
Rank: #16199 (+180)
24M → 40K
7:02 | 8:14/mi
25.2M
3:32:33
Rank: #16173 (+26)
40K → 25.2M
3:19 | 9:37/mi
Finish· 26.22 mi
3:41:08
Rank: #16149 (+24)
25.2M → Finish
8:35 | 8:25/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:56
Pace8:14 /mi
2nd Half
Distance13.11 mi
Time1:53:12
Pace8:38 /mi
📊Positive Split: 4.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:16:5825:048:0425:04
8:04
-
10K
6.21 mi11:42:2650:328:0825:28
8:12
+0:08
15K
9.32 mi12:08:141:16:208:1125:48
8:18
+0:06
20K
12.43 mi12:34:131:42:198:1425:59
8:22
+0:04
Half
13.11 mi12:39:501:47:568:145:37
8:14
-0:08
25K
15.53 mi13:00:362:08:428:1720:46
8:34
+0:20
30K
18.64 mi13:27:202:35:268:2026:44
8:36
+0:02
20M
20.00 mi13:39:132:47:198:2211:53
8:45
+0:09
21M
21.00 mi13:48:242:56:308:249:11
9:11
+0:26
35K
21.75 mi13:54:353:02:418:246:11
8:16
-0:55
23M
23.00 mi14:05:303:13:368:2510:55
8:43
+0:27
24M
24.00 mi14:14:063:22:128:268:36
8:36
-0:07
40K
24.85 mi14:21:083:29:148:257:02
8:14
-0:22
25.2M
25.20 mi14:24:273:32:338:263:19
9:37
+1:23
Finish
26.22 mi14:33:023:41:088:268:35
8:25
-1:12

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

8:04 /mi

Average Pace

8:26 /mi

Slowest Pace

9:37 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:28:38

94% of race

Time at Steady Pace

9:11

4% of race

Time at Slower Pace

3:19

1% of race

Average Pace: 8:26 /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 mi11:16:5825:048:0425:04
8:04
#17147
10K
6.21 mi11:42:2650:328:0825:28
8:12
#17509
15K
9.32 mi12:08:141:16:208:1125:48
8:18
#17696
20K
12.43 mi12:34:131:42:198:1425:59
8:22
#17572
Half
13.11 mi12:39:501:47:568:145:37
8:14
#17564
25K
15.53 mi13:00:362:08:428:1720:46
8:34
#17505
30K
18.64 mi13:27:202:35:268:2026:44
8:36
#17073
20M
20.00 mi13:39:132:47:198:2211:53
8:45
#16924
21M
21.00 mi13:48:242:56:308:249:11
9:11
#16738
35K
21.75 mi13:54:353:02:418:246:11
8:16
#16617
23M
23.00 mi14:05:303:13:368:2510:55
8:43
#16448
24M
24.00 mi14:14:063:22:128:268:36
8:36
#16379
40K
24.85 mi14:21:083:29:148:257:02
8:14
#16199
25.2M
25.20 mi14:24:273:32:338:263:19
9:37
#16173
Finish
26.22 mi14:33:023:41:088:268:35
8:25
#16149
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi171475824582418087(Top 64%)6369(Top 52%)6369(Top 371%)
10K6.21 mi3.10 mi17509-3626040-2166040-21617875(Top 63%)6223(Top 51%)6223(Top 362%)
15K9.32 mi3.11 mi17696-1876142-1026142-10218087(Top 64%)6369(Top 52%)6369(Top 371%)
20K12.43 mi3.11 mi17572+1246082+606082+6017319(Top 61%)5954(Top 49%)5954(Top 347%)
Half13.11 mi0.68 mi17564+86071+116071+1117505(Top 62%)6031(Top 49%)6031(Top 351%)
25K15.53 mi2.42 mi17505+596061+106061+1017582(Top 62%)6177(Top 51%)6177(Top 360%)
30K18.64 mi3.11 mi17073+4325863+1985863+19815432(Top 54%)5143(Top 42%)5143(Top 299%)
20M20.00 mi1.36 mi16924+1495792+715792+7115365(Top 54%)5244(Top 43%)5244(Top 305%)
21M21.00 mi1.00 mi16738+1865722+705722+7014569(Top 51%)4935(Top 40%)4935(Top 287%)
35K21.75 mi0.75 mi16617+1215672+505672+5014103(Top 50%)4739(Top 39%)4739(Top 276%)
23M23.00 mi1.25 mi16448+1695598+745598+7414678(Top 52%)5164(Top 42%)5164(Top 301%)
24M24.00 mi1.00 mi16379+695595+35595+315185(Top 53%)5483(Top 45%)5483(Top 319%)
40K24.85 mi0.85 mi16199+1805514+815514+8111775(Top 41%)3810(Top 31%)3810(Top 222%)
25.2M25.20 mi0.35 mi16173+265510+45510+415227(Top 54%)5668(Top 46%)5668(Top 330%)
Finish26.22 mi1.02 mi16149+245518-85518-815753(Top 55%)5885(Top 48%)5885(Top 343%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 64%
×21stories
+97ft-345ft

Overall

18087

Females

6369

F40-44

6369

5K→10K

3.1 - 6.2 mi

Top 63%
×5stories
+79ft-138ft

Overall

17875

Females

6223

F40-44

6223

10K→15K

6.2 - 9.3 mi

Top 64%
×3stories
+67ft-78ft

Overall

18087

Females

6369

F40-44

6369

15K→20K

9.3 - 12.4 mi

Top 61%
×5stories
+106ft-86ft

Overall

17319

Females

5954

F40-44

5954

20K→Half

12.4 - 13.1 mi

Top 62%
×2stories
+19ft-37ft

Overall

17505

Females

6031

F40-44

6031

Half→25K

13.1 - 15.5 mi

Top 62%
×4stories
+66ft-88ft

Overall

17582

Females

6177

F40-44

6177

25K→30K

15.5 - 18.6 mi

Top 54%
×9stories
+181ft-148ft

Overall

15432

Females

5143

F40-44

5143

30K→20M

18.6 - 20.0 mi

Top 54%
×5stories
+64ft-50ft

Overall

15365

Females

5244

F40-44

5244

20M→21M

20.0 - 21.0 mi

Top 51%
×8stories
+106ft-24ft

Overall

14569

Females

4935

F40-44

4935

21M→35K

21.0 - 21.8 mi

Top 50%
×7stories
+17ft-86ft

Overall

14103

Females

4739

F40-44

4739

35K→23M

21.8 - 23.0 mi

Top 52%
×5stories
+23ft-63ft

Overall

14678

Females

5164

F40-44

5164

23M→24M

23.0 - 24.0 mi

Top 53%
×6stories
+12ft-82ft

Overall

15185

Females

5483

F40-44

5483

24M→40K

24.0 - 24.9 mi

Top 41%
×1story
+6ft-20ft

Overall

11775

Females

3810

F40-44

3810

40K→25.2M

24.9 - 25.2 mi

Top 54%
×1story
+13ft-16ft

Overall

15227

Females

5668

F40-44

5668

25.2M→Finish

25.2 - 26.2 mi

Top 55%
×2stories
+22ft-21ft

Overall

15753

Females

5885

F40-44

5885

Passing Analysis

Category:
Athletes Passed
2379
Passed By
1381
Net Change
+998
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17147
5K → 10K153515-362#17147#17509
10K → 15K136323-187#17509#17696
15K → 20K249125+124#17696#17572
20K → Half4234+8#17572#17564
Half → 25K191132+59#17564#17505
25K → 30K46634+432#17505#17073
30K → 20M17627+149#17073#16924
20M → 21M20721+186#16924#16738
21M → 35K13211+121#16738#16617
35K → 23M19627+169#16617#16448
23M → 24M11546+69#16448#16379
24M → 40K1877+180#16379#16199
40K → 25.2M4822+26#16199#16173
25.2M → Finish8157+24#16173#16149
TOTALS23791381+998
📊

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