Boston Marathon logo
BOSTON MARATHON 2025

Rebecca Chassie

Bib: 23224•F

SC

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 37%
Masters (Masters Women)
#0 / 6759
Top 22%
Division (F45-49)
#0 / 1813
Top 26%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:12/mi
25:29
↑ 97↓ 3451.5%
10K· 6.21 mi
8:10/mi
50:52
↑ 79↓ 1380.4%
15K· 9.32 mi
8:05/mi
1:15:58
↑ 67↓ 78
20K· 12.43 mi
8:08/mi
1:41:13
↑ 106↓ 860.1%
Half· 13.11 mi
7:55/mi
1:46:37
↑ 19↓ 370.5%
25K· 15.53 mi
8:15/mi
2:06:38
↑ 66↓ 880.2%
30K· 18.64 mi
8:23/mi
2:32:42
↑ 181↓ 1480.2%
20M
8:15/mi
2:43:55
↑ 64↓ 500.2%
21M
8:27/mi
2:52:22
↑ 106↓ 241.6%
35K· 21.75 mi
8:00/mi
2:58:21
↑ 17↓ 861.7%
23M
8:10/mi
3:08:34
↑ 23↓ 630.6%
24M
8:01/mi
3:16:35
↓ 821.3%
40K· 24.85 mi
8:00/mi
3:23:25
↓ 200.3%
25.2M
8:36/mi
3:26:23
↑ 13↓ 160.2%
Finish· 26.22 mi
7:41/mi
3:34:13
↑ 22↓ 21

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 Half⚖️ Balanced
Distance13.11 mi
Time1:46:37
Pace8:08 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:47:36
Pace8:12 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:23:0325:298:1225:29
8:12
-
10K
6.21 mi11:48:2650:528:1125:23
8:10
-0:02
15K
9.32 mi12:13:321:15:588:0925:06
8:05
-0:05
20K
12.43 mi12:38:471:41:138:0925:15
8:08
+0:03
Half
13.11 mi12:44:111:46:378:085:24
7:55
-0:13
25K
15.53 mi13:04:122:06:388:0920:01
8:15
+0:20
30K
18.64 mi13:30:162:32:428:1126:04
8:23
+0:08
20M
20.00 mi13:41:292:43:558:1211:13
8:15
-0:08
21M
21.00 mi13:49:562:52:228:128:27
8:27
+0:12
35K
21.75 mi13:55:552:58:218:125:59
8:00
-0:27
23M
23.00 mi14:06:083:08:348:1210:13
8:10
+0:10
24M
24.00 mi14:14:093:16:358:118:01
8:01
-0:09
40K
24.85 mi14:20:593:23:258:116:50
8:00
-0:01
25.2M
25.20 mi14:23:573:26:238:112:58
8:36
+0:36
Finish
26.22 mi14:31:473:34:138:117:50
7:41
-0:55

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

7:41 /mi

Average Pace

8:11 /mi

Slowest Pace

8:36 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:31:15

99% of race

Time at Steady Pace

2:58

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:10 /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 mi11:23:0325:298:1225:29
8:12
#18114
10K
6.21 mi11:48:2650:528:1125:23
8:10
#17881
15K
9.32 mi12:13:321:15:588:0925:06
8:05
#17435
20K
12.43 mi12:38:471:41:138:0925:15
8:08
#16999
Half
13.11 mi12:44:111:46:378:085:24
7:55
#16912
25K
15.53 mi13:04:122:06:388:0920:01
8:15
#16653
30K
18.64 mi13:30:162:32:428:1126:04
8:23
#16162
20M
20.00 mi13:41:292:43:558:1211:13
8:15
#15835
21M
21.00 mi13:49:562:52:228:128:27
8:27
#15452
35K
21.75 mi13:55:552:58:218:125:59
8:00
#15304
23M
23.00 mi14:06:083:08:348:1210:13
8:10
#15011
24M
24.00 mi14:14:093:16:358:118:01
8:01
#14819
40K
24.85 mi14:20:593:23:258:116:50
8:00
#14621
25.2M
25.20 mi14:23:573:26:238:112:58
8:36
#14535
Finish
26.22 mi14:31:473:34:138:117:50
7:41
#14349
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi181146409640916606(Top 58%)5499(Top 45%)5499(Top 303%)
10K6.21 mi3.10 mi17881+2336254+1556254+15517693(Top 62%)6109(Top 50%)6109(Top 337%)
15K9.32 mi3.11 mi17435+4465970+2845970+28416606(Top 58%)5499(Top 45%)5499(Top 303%)
20K12.43 mi3.11 mi16999+4365738+2325738+23215840(Top 56%)5119(Top 42%)5119(Top 282%)
Half13.11 mi0.68 mi16912+875686+525686+5215265(Top 54%)4762(Top 39%)4762(Top 263%)
25K15.53 mi2.42 mi16653+2595556+1305556+13015648(Top 55%)5096(Top 42%)5096(Top 281%)
30K18.64 mi3.11 mi16162+4915318+2385318+23814090(Top 50%)4426(Top 36%)4426(Top 244%)
20M20.00 mi1.36 mi15835+3275172+1465172+14612216(Top 43%)3566(Top 29%)3566(Top 197%)
21M21.00 mi1.00 mi15452+3834984+1884984+18810202(Top 36%)2717(Top 22%)2717(Top 150%)
35K21.75 mi0.75 mi15304+1484912+724912+7212307(Top 43%)3814(Top 31%)3814(Top 210%)
23M23.00 mi1.25 mi15011+2934769+1434769+14311160(Top 39%)3317(Top 27%)3317(Top 183%)
24M24.00 mi1.00 mi14819+1924694+754694+7511417(Top 40%)3540(Top 29%)3540(Top 195%)
40K24.85 mi0.85 mi14621+1984610+844610+8410209(Top 36%)3049(Top 25%)3049(Top 168%)
25.2M25.20 mi0.35 mi14535+864584+264584+269556(Top 34%)2833(Top 23%)2833(Top 156%)
Finish26.22 mi1.02 mi14349+1864510+744510+7410658(Top 38%)3303(Top 27%)3303(Top 182%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 58%
×21story building
+97ft-345ft

Overall

16606

Females

5499

F45-49

5499

5K→10K

3.1 - 6.2 mi

Top 62%
×5story building
+79ft-138ft

Overall

17693

Females

6109

F45-49

6109

10K→15K

6.2 - 9.3 mi

Top 58%
×3story building
+67ft-78ft

Overall

16606

Females

5499

F45-49

5499

15K→20K

9.3 - 12.4 mi

Top 56%
×5story building
+106ft-86ft

Overall

15840

Females

5119

F45-49

5119

20K→Half

12.4 - 13.1 mi

Top 54%
×2story building
+19ft-37ft

Overall

15265

Females

4762

F45-49

4762

Half→25K

13.1 - 15.5 mi

Top 55%
×4story building
+66ft-88ft

Overall

15648

Females

5096

F45-49

5096

25K→30K

15.5 - 18.6 mi

Top 50%
×9story building
+181ft-148ft

Overall

14090

Females

4426

F45-49

4426

30K→20M

18.6 - 20.0 mi

Top 43%
×5story building
+64ft-50ft

Overall

12216

Females

3566

F45-49

3566

20M→21M

20.0 - 21.0 mi

Top 36%
×8story building
+106ft-24ft

Overall

10202

Females

2717

F45-49

2717

21M→35K

21.0 - 21.8 mi

Top 43%
×7story building
+17ft-86ft

Overall

12307

Females

3814

F45-49

3814

35K→23M

21.8 - 23.0 mi

Top 39%
×5story building
+23ft-63ft

Overall

11160

Females

3317

F45-49

3317

23M→24M

23.0 - 24.0 mi

Top 40%
×6story building
+12ft-82ft

Overall

11417

Females

3540

F45-49

3540

24M→40K

24.0 - 24.9 mi

Top 36%
×1story
+6ft-20ft

Overall

10209

Females

3049

F45-49

3049

40K→25.2M

24.9 - 25.2 mi

Top 34%
×1story
+13ft-16ft

Overall

9556

Females

2833

F45-49

2833

25.2M→Finish

25.2 - 26.2 mi

Top 38%
×2story building
+22ft-21ft

Overall

10658

Females

3303

F45-49

3303

Passing Analysis

Category:
Athletes Passed
4118
Passed By
353
Net Change
+3765
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18114
5K → 10K415182+233#18114#17881
10K → 15K48842+446#17881#17435
15K → 20K45620+436#17435#16999
20K → Half936+87#16999#16912
Half → 25K29940+259#16912#16653
25K → 30K51827+491#16653#16162
30K → 20M3314+327#16162#15835
20M → 21M3863+383#15835#15452
21M → 35K1557+148#15452#15304
35K → 23M2974+293#15304#15011
23M → 24M1997+192#15011#14819
24M → 40K2002+198#14819#14621
40K → 25.2M882+86#14621#14535
25.2M → Finish1937+186#14535#14349
TOTALS4118353+3765
📊

Passing Visuals

Category:
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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing