Boston Marathon logo
BOSTON MARATHON 2025

Cassie Chambers

Bib: 15633•F

FL

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 28%
Gender (Female)
#0 / 12228
Top 11%
Division (F18-39)
#0 / 5469
Top 21%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:45
Rank: #10585
Start → 5K
22:45 | 7:19/mi
10K· 6.21 mi
45:11
Rank: #10094 (+491)
5K → 10K
22:26 | 7:13/mi
15K· 9.32 mi
1:07:40
Rank: #9852 (+242)
10K → 15K
22:29 | 7:14/mi
20K· 12.43 mi
1:30:01
Rank: #9368 (+484)
15K → 20K
22:21 | 7:12/mi
Half· 13.11 mi
1:34:52
Rank: #9316 (+52)
20K → Half
4:51 | 7:07/mi
25K· 15.53 mi
1:52:24
Rank: #8993 (+323)
Half → 25K
17:32 | 7:14/mi
30K· 18.64 mi
2:15:58
Rank: #8782 (+211)
25K → 30K
23:34 | 7:35/mi
20M
2:26:18
Rank: #8658 (+124)
30K → 20M
10:20 | 7:36/mi
21M
2:34:27
Rank: #8593 (+65)
20M → 21M
8:09 | 8:09/mi
35K· 21.75 mi
2:40:01
Rank: #8548 (+45)
21M → 35K
5:34 | 7:26/mi
23M
2:49:42
Rank: #8447 (+101)
35K → 23M
9:41 | 7:44/mi
24M
2:57:10
Rank: #8342 (+105)
23M → 24M
7:28 | 7:28/mi
40K· 24.85 mi
3:03:33
Rank: #8243 (+99)
24M → 40K
6:23 | 7:28/mi
25.2M
3:06:17
Rank: #8188 (+55)
40K → 25.2M
2:44 | 7:56/mi
Finish· 26.22 mi
3:13:24
Rank: #8036 (+152)
25.2M → Finish
7:07 | 6:59/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:34:52
Pace7:14 /mi
2nd Half
Distance13.11 mi
Time1:38:32
Pace7:31 /mi
📊Positive Split: 3.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:54:1922:457:1922:45
7:19
-
10K
6.21 mi11:16:4545:117:1622:26
7:13
-0:06
15K
9.32 mi11:39:141:07:407:1622:29
7:14
+0:01
20K
12.43 mi12:01:351:30:017:1522:21
7:12
-0:02
Half
13.11 mi12:06:261:34:527:144:51
7:07
-0:05
25K
15.53 mi12:23:581:52:247:1417:32
7:14
+0:07
30K
18.64 mi12:47:322:15:587:1823:34
7:35
+0:21
20M
20.00 mi12:57:522:26:187:1910:20
7:36
+0:01
21M
21.00 mi13:06:012:34:277:218:09
8:09
+0:33
35K
21.75 mi13:11:352:40:017:215:34
7:26
-0:43
23M
23.00 mi13:21:162:49:427:239:41
7:44
+0:18
24M
24.00 mi13:28:442:57:107:237:28
7:28
-0:16
40K
24.85 mi13:35:073:03:337:236:23
7:28
0:00
25.2M
25.20 mi13:37:513:06:177:242:44
7:56
+0:28
Finish
26.22 mi13:44:583:13:247:237:07
6:59
-0:57

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

6:59 /mi

Average Pace

7:23 /mi

Slowest Pace

8:09 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:52:50

89% of race

Time at Steady Pace

20:34

11% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:23 /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 mi10:54:1922:457:1922:45
7:19
#10585
10K
6.21 mi11:16:4545:117:1622:26
7:13
#10094
15K
9.32 mi11:39:141:07:407:1622:29
7:14
#9852
20K
12.43 mi12:01:351:30:017:1522:21
7:12
#9368
Half
13.11 mi12:06:261:34:527:144:51
7:07
#9316
25K
15.53 mi12:23:581:52:247:1417:32
7:14
#8993
30K
18.64 mi12:47:322:15:587:1823:34
7:35
#8782
20M
20.00 mi12:57:522:26:187:1910:20
7:36
#8658
21M
21.00 mi13:06:012:34:277:218:09
8:09
#8593
35K
21.75 mi13:11:352:40:017:215:34
7:26
#8548
23M
23.00 mi13:21:162:49:427:239:41
7:44
#8447
24M
24.00 mi13:28:442:57:107:237:28
7:28
#8342
40K
24.85 mi13:35:073:03:337:236:23
7:28
#8243
25.2M
25.20 mi13:37:513:06:177:242:44
7:56
#8188
Finish
26.22 mi13:44:583:13:247:237:07
6:59
#8036
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi10585207520759443(Top 33%)1623(Top 13%)1623(Top 30%)
10K6.21 mi3.10 mi10094+4911855+2201855+2209674(Top 34%)1670(Top 14%)1670(Top 31%)
15K9.32 mi3.11 mi9852+2421774+811774+819443(Top 33%)1623(Top 13%)1623(Top 30%)
20K12.43 mi3.11 mi9368+4841581+1931581+1938174(Top 29%)1178(Top 10%)1178(Top 22%)
Half13.11 mi0.68 mi9316+521560+211560+218423(Top 30%)1261(Top 10%)1261(Top 23%)
25K15.53 mi2.42 mi8993+3231445+1151445+1157852(Top 28%)1161(Top 9%)1161(Top 21%)
30K18.64 mi3.11 mi8782+2111410+351410+358352(Top 29%)1530(Top 13%)1530(Top 28%)
20M20.00 mi1.36 mi8658+1241404+61404+67728(Top 27%)1431(Top 12%)1431(Top 26%)
21M21.00 mi1.00 mi8593+651408-41408-48276(Top 29%)1835(Top 15%)1835(Top 34%)
35K21.75 mi0.75 mi8548+451404+41404+48243(Top 29%)1771(Top 14%)1771(Top 32%)
23M23.00 mi1.25 mi8447+1011413-91413-98121(Top 29%)1867(Top 15%)1867(Top 34%)
24M24.00 mi1.00 mi8342+1051399+141399+147480(Top 26%)1648(Top 13%)1648(Top 30%)
40K24.85 mi0.85 mi8243+991396+31396+36628(Top 23%)1393(Top 11%)1393(Top 25%)
25.2M25.20 mi0.35 mi8188+551389+71389+75654(Top 20%)1117(Top 9%)1117(Top 20%)
Finish26.22 mi1.02 mi8036+1521364+251364+255659(Top 20%)1125(Top 9%)1125(Top 21%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 33%
×21stories
+97ft-345ft

Overall

9443

Females

1623

F18-39

1623

5K→10K

3.1 - 6.2 mi

Top 34%
×5stories
+79ft-138ft

Overall

9674

Females

1670

F18-39

1670

10K→15K

6.2 - 9.3 mi

Top 33%
×3stories
+67ft-78ft

Overall

9443

Females

1623

F18-39

1623

15K→20K

9.3 - 12.4 mi

Top 29%
×5stories
+106ft-86ft

Overall

8174

Females

1178

F18-39

1178

20K→Half

12.4 - 13.1 mi

Top 30%
×2stories
+19ft-37ft

Overall

8423

Females

1261

F18-39

1261

Half→25K

13.1 - 15.5 mi

Top 28%
×4stories
+66ft-88ft

Overall

7852

Females

1161

F18-39

1161

25K→30K

15.5 - 18.6 mi

Top 29%
×9stories
+181ft-148ft

Overall

8352

Females

1530

F18-39

1530

30K→20M

18.6 - 20.0 mi

Top 27%
×5stories
+64ft-50ft

Overall

7728

Females

1431

F18-39

1431

20M→21M

20.0 - 21.0 mi

Top 29%
×8stories
+106ft-24ft

Overall

8276

Females

1835

F18-39

1835

21M→35K

21.0 - 21.8 mi

Top 29%
×7stories
+17ft-86ft

Overall

8243

Females

1771

F18-39

1771

35K→23M

21.8 - 23.0 mi

Top 29%
×5stories
+23ft-63ft

Overall

8121

Females

1867

F18-39

1867

23M→24M

23.0 - 24.0 mi

Top 26%
×6stories
+12ft-82ft

Overall

7480

Females

1648

F18-39

1648

24M→40K

24.0 - 24.9 mi

Top 23%
×1story
+6ft-20ft

Overall

6628

Females

1393

F18-39

1393

40K→25.2M

24.9 - 25.2 mi

Top 20%
×1story
+13ft-16ft

Overall

5654

Females

1117

F18-39

1117

25.2M→Finish

25.2 - 26.2 mi

Top 20%
×2stories
+22ft-21ft

Overall

5659

Females

1125

F18-39

1125

Passing Analysis

Category:
Athletes Passed
3123*
Passed By
574
Net Change
+2549
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10585
5K → 10K57382+491#10585#10094
10K → 15K316*74+242#10094#9852
15K → 20K49915+484#9852#9368
20K → Half586+52#9368#9316
Half → 25K33815+323#9316#8993
25K → 30K328117+211#8993#8782
30K → 20M16238+124#8782#8658
20M → 21M12762+65#8658#8593
21M → 35K8237+45#8593#8548
35K → 23M15857+101#8548#8447
23M → 24M13227+105#8447#8342
24M → 40K12122+99#8342#8243
40K → 25.2M616+55#8243#8188
25.2M → Finish16816+152#8188#8036
TOTALS3123*574+2549

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing