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BOSTON MARATHON 2025

Chloe Brennan

Bib: 9868•F

BC

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 28%
Gender (Female)
#0 / 12228
Top 11%
Division (F18-39)
#0 / 5469
Top 20%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:14
Rank: #6608
Start → 5K
21:14 | 6:50/mi
10K· 6.21 mi
42:36
Rank: #6812 (-204)
5K → 10K
21:22 | 6:53/mi
15K· 9.32 mi
1:04:01
Rank: #6824 (-12)
10K → 15K
21:25 | 6:54/mi
20K· 12.43 mi
1:25:42
Rank: #6791 (+33)
15K → 20K
21:41 | 6:59/mi
Half· 13.11 mi
1:30:23
Rank: #6792 (-1)
20K → Half
4:41 | 6:52/mi
25K· 15.53 mi
1:47:14
Rank: #6595 (+197)
Half → 25K
16:51 | 6:57/mi
30K· 18.64 mi
2:10:17
Rank: #6594 (+1)
25K → 30K
23:03 | 7:25/mi
20M
2:22:11
Rank: #7130 (-536)
30K → 20M
11:54 | 8:45/mi
21M
2:29:58
Rank: #7004 (+126)
20M → 21M
7:47 | 7:47/mi
35K· 21.75 mi
2:35:35
Rank: #7030 (-26)
21M → 35K
5:37 | 7:30/mi
23M
2:46:02
Rank: #7232 (-202)
35K → 23M
10:27 | 8:21/mi
24M
2:53:59
Rank: #7347 (-115)
23M → 24M
7:57 | 7:57/mi
40K· 24.85 mi
3:01:02
Rank: #7456 (-109)
24M → 40K
7:03 | 8:15/mi
25.2M
3:05:00
Rank: #7776 (-320)
40K → 25.2M
3:58 | 11:30/mi
Finish· 26.22 mi
3:13:04
Rank: #7926 (-150)
25.2M → Finish
8:04 | 7:55/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:30:23
Pace6:54 /mi
2nd Half
Distance13.11 mi
Time1:42:41
Pace7:50 /mi
📊Positive Split: 13.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:49:3021:146:5021:14
6:50
-
10K
6.21 mi11:10:5242:366:5121:22
6:53
+0:03
15K
9.32 mi11:32:171:04:016:5221:25
6:54
+0:01
20K
12.43 mi11:53:581:25:426:5421:41
6:59
+0:05
Half
13.11 mi11:58:391:30:236:544:41
6:52
-0:07
25K
15.53 mi12:15:301:47:146:5416:51
6:57
+0:05
30K
18.64 mi12:38:332:10:176:5923:03
7:25
+0:28
20M
20.00 mi12:50:272:22:117:0711:54
8:45
+1:20
21M
21.00 mi12:58:142:29:587:087:47
7:47
-0:58
35K
21.75 mi13:03:512:35:357:095:37
7:30
-0:17
23M
23.00 mi13:14:182:46:027:1310:27
8:21
+0:51
24M
24.00 mi13:22:152:53:597:157:57
7:57
-0:24
40K
24.85 mi13:29:183:01:027:177:03
8:15
+0:18
25.2M
25.20 mi13:33:163:05:007:203:58
11:30
+3:15
Finish
26.22 mi13:41:203:13:047:228:04
7:55
-3:35

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

6:50 /mi

Average Pace

7:22 /mi

Slowest Pace

11:30 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:08:42

36% of race

Time at Steady Pace

1:31:00

47% of race

Time at Slower Pace

33:22

17% of race

Average Pace: 7:22 /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 mi10:49:3021:146:5021:14
6:50
#6608
10K
6.21 mi11:10:5242:366:5121:22
6:53
#6812
15K
9.32 mi11:32:171:04:016:5221:25
6:54
#6824
20K
12.43 mi11:53:581:25:426:5421:41
6:59
#6791
Half
13.11 mi11:58:391:30:236:544:41
6:52
#6792
25K
15.53 mi12:15:301:47:146:5416:51
6:57
#6595
30K
18.64 mi12:38:332:10:176:5923:03
7:25
#6594
20M
20.00 mi12:50:272:22:117:0711:54
8:45
#7130
21M
21.00 mi12:58:142:29:587:087:47
7:47
#7004
35K
21.75 mi13:03:512:35:357:095:37
7:30
#7030
23M
23.00 mi13:14:182:46:027:1310:27
8:21
#7232
24M
24.00 mi13:22:152:53:597:157:57
7:57
#7347
40K
24.85 mi13:29:183:01:027:177:03
8:15
#7456
25.2M
25.20 mi13:33:163:05:007:203:58
11:30
#7776
Finish
26.22 mi13:41:203:13:047:228:04
7:55
#7926
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi66085965966924(Top 24%)715(Top 6%)715(Top 13%)
10K6.21 mi3.10 mi6812-204653-57653-577090(Top 25%)728(Top 6%)728(Top 13%)
15K9.32 mi3.11 mi6824-12671-18671-186924(Top 24%)715(Top 6%)715(Top 13%)
20K12.43 mi3.11 mi6791+33656+15656+156761(Top 24%)722(Top 6%)722(Top 13%)
Half13.11 mi0.68 mi6792-1658-2658-26739(Top 24%)717(Top 6%)717(Top 13%)
25K15.53 mi2.42 mi6595+197636+22636+226006(Top 21%)594(Top 5%)594(Top 11%)
30K18.64 mi3.11 mi6594+1674-38674-387182(Top 25%)1092(Top 9%)1092(Top 20%)
20M20.00 mi1.36 mi7130-536836-162836-16215419(Top 54%)5269(Top 43%)5269(Top 96%)
21M21.00 mi1.00 mi7004+126830+6830+66131(Top 22%)976(Top 8%)976(Top 18%)
35K21.75 mi0.75 mi7030-26855-25855-258698(Top 31%)1977(Top 16%)1977(Top 36%)
23M23.00 mi1.25 mi7232-202967-112967-11212321(Top 43%)3904(Top 32%)3904(Top 71%)
24M24.00 mi1.00 mi7347-1151040-731040-7310896(Top 38%)3238(Top 26%)3238(Top 59%)
40K24.85 mi0.85 mi7456-1091114-741114-7411833(Top 42%)3820(Top 31%)3820(Top 70%)
25.2M25.20 mi0.35 mi7776-3201242-1281242-12822061(Top 78%)9171(Top 75%)9171(Top 168%)
Finish26.22 mi1.02 mi7926-1501325-831325-8312298(Top 43%)4068(Top 33%)4068(Top 74%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 24%
×21stories
+97ft-345ft

Overall

6924

Females

715

F18-39

715

5K→10K

3.1 - 6.2 mi

Top 25%
×5stories
+79ft-138ft

Overall

7090

Females

728

F18-39

728

10K→15K

6.2 - 9.3 mi

Top 24%
×3stories
+67ft-78ft

Overall

6924

Females

715

F18-39

715

15K→20K

9.3 - 12.4 mi

Top 24%
×5stories
+106ft-86ft

Overall

6761

Females

722

F18-39

722

20K→Half

12.4 - 13.1 mi

Top 24%
×2stories
+19ft-37ft

Overall

6739

Females

717

F18-39

717

Half→25K

13.1 - 15.5 mi

Top 21%
×4stories
+66ft-88ft

Overall

6006

Females

594

F18-39

594

25K→30K

15.5 - 18.6 mi

Top 25%
×9stories
+181ft-148ft

Overall

7182

Females

1092

F18-39

1092

30K→20M

18.6 - 20.0 mi

Top 54%
×5stories
+64ft-50ft

Overall

15419

Females

5269

F18-39

5269

20M→21M

20.0 - 21.0 mi

Top 22%
×8stories
+106ft-24ft

Overall

6131

Females

976

F18-39

976

21M→35K

21.0 - 21.8 mi

Top 31%
×7stories
+17ft-86ft

Overall

8698

Females

1977

F18-39

1977

35K→23M

21.8 - 23.0 mi

Top 43%
×5stories
+23ft-63ft

Overall

12321

Females

3904

F18-39

3904

23M→24M

23.0 - 24.0 mi

Top 38%
×6stories
+12ft-82ft

Overall

10896

Females

3238

F18-39

3238

24M→40K

24.0 - 24.9 mi

Top 42%
×1story
+6ft-20ft

Overall

11833

Females

3820

F18-39

3820

40K→25.2M

24.9 - 25.2 mi

Top 78%
×1story
+13ft-16ft

Overall

22061

Females

9171

F18-39

9171

25.2M→Finish

25.2 - 26.2 mi

Top 43%
×2stories
+22ft-21ft

Overall

12298

Females

4068

F18-39

4068

Passing Analysis

Category:
Athletes Passed
1213
Passed By
2531
Net Change
-1318
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#6608
5K → 10K119323-204#6608#6812
10K → 15K145157-12#6812#6824
15K → 20K141108+33#6824#6791
20K → Half2324-1#6791#6792
Half → 25K22831+197#6792#6595
25K → 30K186185+1#6595#6594
30K → 20M17553-536#6594#7130
20M → 21M14923+126#7130#7004
21M → 35K4571-26#7004#7030
35K → 23M39241-202#7030#7232
23M → 24M41156-115#7232#7347
24M → 40K45154-109#7347#7456
40K → 25.2M4324-320#7456#7776
25.2M → Finish31181-150#7776#7926
TOTALS12132531-1318
📊

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