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BOSTON MARATHON 2025

Chelsea Grogan

Bib: 10671•F

NJ

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 31%
Gender (Female)
#0 / 12228
Top 14%
Division (F18-39)
#0 / 5469
Top 25%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:05
Rank: #8730
Start → 5K
22:05 | 7:06/mi
10K· 6.21 mi
43:52
Rank: #8354 (+376)
5K → 10K
21:47 | 7:01/mi
15K· 9.32 mi
1:05:38
Rank: #8056 (+298)
10K → 15K
21:46 | 7:00/mi
20K· 12.43 mi
1:27:41
Rank: #7871 (+185)
15K → 20K
22:03 | 7:06/mi
Half· 13.11 mi
1:32:29
Rank: #7861 (+10)
20K → Half
4:48 | 7:02/mi
25K· 15.53 mi
1:50:06
Rank: #7842 (+19)
Half → 25K
17:37 | 7:16/mi
30K· 18.64 mi
2:14:07
Rank: #7991 (-149)
25K → 30K
24:01 | 7:44/mi
20M
2:25:18
Rank: #8259 (-268)
30K → 20M
11:11 | 8:14/mi
21M
2:34:12
Rank: #8483 (-224)
20M → 21M
8:54 | 8:54/mi
35K· 21.75 mi
2:40:07
Rank: #8585 (-102)
21M → 35K
5:55 | 7:55/mi
23M
2:50:10
Rank: #8635 (-50)
35K → 23M
10:03 | 8:02/mi
24M
2:58:00
Rank: #8671 (-36)
23M → 24M
7:50 | 7:50/mi
40K· 24.85 mi
3:04:50
Rank: #8687 (-16)
24M → 40K
6:50 | 8:00/mi
25.2M
3:07:50
Rank: #8701 (-14)
40K → 25.2M
3:00 | 8:42/mi
Finish· 26.22 mi
3:15:38
Rank: #8759 (-58)
25.2M → Finish
7:48 | 7:39/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:32:29
Pace7:03 /mi
2nd Half
Distance13.11 mi
Time1:43:09
Pace7:52 /mi
📊Positive Split: 11.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:47:5422:057:0622:05
7:06
-
10K
6.21 mi11:09:4143:527:0421:47
7:01
-0:05
15K
9.32 mi11:31:271:05:387:0321:46
7:00
-0:01
20K
12.43 mi11:53:301:27:417:0322:03
7:06
+0:06
Half
13.11 mi11:58:181:32:297:034:48
7:02
-0:04
25K
15.53 mi12:15:551:50:067:0517:37
7:16
+0:14
30K
18.64 mi12:39:562:14:077:1224:01
7:44
+0:28
20M
20.00 mi12:51:072:25:187:1611:11
8:14
+0:30
21M
21.00 mi13:00:012:34:127:218:54
8:54
+0:40
35K
21.75 mi13:05:562:40:077:225:55
7:55
-0:59
23M
23.00 mi13:15:592:50:107:2410:03
8:02
+0:07
24M
24.00 mi13:23:492:58:007:257:50
7:50
-0:12
40K
24.85 mi13:30:393:04:507:266:50
8:00
+0:10
25.2M
25.20 mi13:33:393:07:507:273:00
8:42
+0:42
Finish
26.22 mi13:41:273:15:387:287:48
7:39
-1:03

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

7:00 /mi

Average Pace

7:28 /mi

Slowest Pace

8:54 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:50:06

56% of race

Time at Steady Pace

52:24

27% of race

Time at Slower Pace

33:08

17% of race

Average Pace: 7:28 /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 mi10:47:5422:057:0622:05
7:06
#8730
10K
6.21 mi11:09:4143:527:0421:47
7:01
#8354
15K
9.32 mi11:31:271:05:387:0321:46
7:00
#8056
20K
12.43 mi11:53:301:27:417:0322:03
7:06
#7871
Half
13.11 mi11:58:181:32:297:034:48
7:02
#7861
25K
15.53 mi12:15:551:50:067:0517:37
7:16
#7842
30K
18.64 mi12:39:562:14:077:1224:01
7:44
#7991
20M
20.00 mi12:51:072:25:187:1611:11
8:14
#8259
21M
21.00 mi13:00:012:34:127:218:54
8:54
#8483
35K
21.75 mi13:05:562:40:077:225:55
7:55
#8585
23M
23.00 mi13:15:592:50:107:2410:03
8:02
#8635
24M
24.00 mi13:23:492:58:007:257:50
7:50
#8671
40K
24.85 mi13:30:393:04:507:266:50
8:00
#8687
25.2M
25.20 mi13:33:393:07:507:273:00
8:42
#8701
Finish
26.22 mi13:41:273:15:387:287:48
7:39
#8759
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi8730125712577679(Top 27%)929(Top 8%)929(Top 17%)
10K6.21 mi3.10 mi8354+3761129+1281129+1288010(Top 28%)1013(Top 8%)1013(Top 19%)
15K9.32 mi3.11 mi8056+2981025+1041025+1047679(Top 27%)929(Top 8%)929(Top 17%)
20K12.43 mi3.11 mi7871+185978+47978+477510(Top 26%)936(Top 8%)936(Top 17%)
Half13.11 mi0.68 mi7861+109789787910(Top 28%)1069(Top 9%)1069(Top 20%)
25K15.53 mi2.42 mi7842+19989-11989-118124(Top 29%)1268(Top 10%)1268(Top 23%)
30K18.64 mi3.11 mi7991-1491107-1181107-1189413(Top 33%)2007(Top 16%)2007(Top 37%)
20M20.00 mi1.36 mi8259-2681234-1271234-12712002(Top 42%)3435(Top 28%)3435(Top 63%)
21M21.00 mi1.00 mi8483-2241362-1281362-12812926(Top 46%)4069(Top 33%)4069(Top 74%)
35K21.75 mi0.75 mi8585-1021424-621424-6211636(Top 41%)3438(Top 28%)3438(Top 63%)
23M23.00 mi1.25 mi8635-501485-611485-6110224(Top 36%)2842(Top 23%)2842(Top 52%)
24M24.00 mi1.00 mi8671-361537-521537-5210066(Top 35%)2830(Top 23%)2830(Top 52%)
40K24.85 mi0.85 mi8687-161587-501587-5010150(Top 36%)2990(Top 24%)2990(Top 55%)
25.2M25.20 mi0.35 mi8701-141605-181605-1810025(Top 35%)3012(Top 25%)3012(Top 55%)
Finish26.22 mi1.02 mi8759-581659-541659-5410360(Top 36%)3146(Top 26%)3146(Top 58%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 27%
×21stories
+97ft-345ft

Overall

7679

Females

929

F18-39

929

5K→10K

3.1 - 6.2 mi

Top 28%
×5stories
+79ft-138ft

Overall

8010

Females

1013

F18-39

1013

10K→15K

6.2 - 9.3 mi

Top 27%
×3stories
+67ft-78ft

Overall

7679

Females

929

F18-39

929

15K→20K

9.3 - 12.4 mi

Top 26%
×5stories
+106ft-86ft

Overall

7510

Females

936

F18-39

936

20K→Half

12.4 - 13.1 mi

Top 28%
×2stories
+19ft-37ft

Overall

7910

Females

1069

F18-39

1069

Half→25K

13.1 - 15.5 mi

Top 29%
×4stories
+66ft-88ft

Overall

8124

Females

1268

F18-39

1268

25K→30K

15.5 - 18.6 mi

Top 33%
×9stories
+181ft-148ft

Overall

9413

Females

2007

F18-39

2007

30K→20M

18.6 - 20.0 mi

Top 42%
×5stories
+64ft-50ft

Overall

12002

Females

3435

F18-39

3435

20M→21M

20.0 - 21.0 mi

Top 46%
×8stories
+106ft-24ft

Overall

12926

Females

4069

F18-39

4069

21M→35K

21.0 - 21.8 mi

Top 41%
×7stories
+17ft-86ft

Overall

11636

Females

3438

F18-39

3438

35K→23M

21.8 - 23.0 mi

Top 36%
×5stories
+23ft-63ft

Overall

10224

Females

2842

F18-39

2842

23M→24M

23.0 - 24.0 mi

Top 35%
×6stories
+12ft-82ft

Overall

10066

Females

2830

F18-39

2830

24M→40K

24.0 - 24.9 mi

Top 36%
×1story
+6ft-20ft

Overall

10150

Females

2990

F18-39

2990

40K→25.2M

24.9 - 25.2 mi

Top 35%
×1story
+13ft-16ft

Overall

10025

Females

3012

F18-39

3012

25.2M→Finish

25.2 - 26.2 mi

Top 36%
×2stories
+22ft-21ft

Overall

10360

Females

3146

F18-39

3146

Passing Analysis

Category:
Athletes Passed
1784
Passed By
1813
Net Change
-29
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8730
5K → 10K45478+376#8730#8354
10K → 15K32426+298#8354#8056
15K → 20K24459+185#8056#7871
20K → Half3323+10#7871#7861
Half → 25K126107+19#7861#7842
25K → 30K142291-149#7842#7991
30K → 20M45313-268#7991#8259
20M → 21M38262-224#8259#8483
21M → 35K34136-102#8483#8585
35K → 23M103153-50#8585#8635
23M → 24M67103-36#8635#8671
24M → 40K85101-16#8671#8687
40K → 25.2M2943-14#8687#8701
25.2M → Finish60118-58#8701#8759
TOTALS17841813-29
📊

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