Boston Marathon logo
BOSTON MARATHON 2025

Katherine Fleming

Bib: 23831•F

NY

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F50-54)
#0 / 1303
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
8:38/mi
26:48
↑ 97↓ 3451.5%
10K· 6.21 mi
8:50/mi
54:16
↑ 79↓ 1380.4%
15K· 9.32 mi
8:42/mi
1:21:19
↑ 67↓ 78
20K· 12.43 mi
8:55/mi
1:49:02
↑ 106↓ 860.1%
Half· 13.11 mi
8:26/mi
1:54:47
↑ 19↓ 370.5%
25K· 15.53 mi
9:13/mi
2:17:07
↑ 66↓ 880.2%
30K· 18.64 mi
9:35/mi
2:46:54
↑ 181↓ 1480.2%
20M
10:03/mi
3:00:33
↑ 64↓ 500.2%
21M
10:50/mi
3:11:23
↑ 106↓ 241.6%
35K· 21.75 mi
9:13/mi
3:18:17
↑ 17↓ 861.7%
23M
10:05/mi
3:30:54
↑ 23↓ 630.6%
24M
9:27/mi
3:40:21
↓ 821.3%
40K· 24.85 mi
10:20/mi
3:49:11
↓ 200.3%
25.2M
11:42/mi
3:53:13
↑ 13↓ 160.2%
Finish· 26.22 mi
9:48/mi
4:03:12
↑ 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 HalfFaster
Distance13.11 mi
Time1:54:47
Pace8:45 /mi
2nd Half
Distance13.11 mi
Time2:08:25
Pace9:48 /mi
📊Positive Split: 11.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:24:2326:488:3826:48
8:38
-
10K
6.21 mi11:51:5154:168:4427:28
8:50
+0:12
15K
9.32 mi12:18:541:21:198:4327:03
8:42
-0:08
20K
12.43 mi12:46:371:49:028:4627:43
8:55
+0:13
Half
13.11 mi12:52:221:54:478:455:45
8:26
-0:29
25K
15.53 mi13:14:422:17:078:5022:20
9:13
+0:47
30K
18.64 mi13:44:292:46:548:5729:47
9:35
+0:22
20M
20.00 mi13:58:083:00:339:0213:39
10:03
+0:28
21M
21.00 mi14:08:583:11:239:0710:50
10:50
+0:47
35K
21.75 mi14:15:523:18:179:076:54
9:13
-1:37
23M
23.00 mi14:28:293:30:549:1012:37
10:05
+0:52
24M
24.00 mi14:37:563:40:219:119:27
9:27
-0:38
40K
24.85 mi14:46:463:49:119:138:50
10:20
+0:53
25.2M
25.20 mi14:50:483:53:139:154:02
11:42
+1:22
Finish
26.22 mi15:00:474:03:129:179:59
9:48
-1:54

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

8:26 /mi

Average Pace

9:17 /mi

Slowest Pace

11:42 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:54:47

47% of race

Time at Steady Pace

1:18:27

32% of race

Time at Slower Pace

49:58

21% of race

Average Pace: 9:17 /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 mi11:24:2326:488:3826:48
8:38
#20623
10K
6.21 mi11:51:5154:168:4427:28
8:50
#21080
15K
9.32 mi12:18:541:21:198:4327:03
8:42
#20879
20K
12.43 mi12:46:371:49:028:4627:43
8:55
#20792
Half
13.11 mi12:52:221:54:478:455:45
8:26
#20703
25K
15.53 mi13:14:422:17:078:5022:20
9:13
#20750
30K
18.64 mi13:44:292:46:548:5729:47
9:35
#20648
20M
20.00 mi13:58:083:00:339:0213:39
10:03
#20685
21M
21.00 mi14:08:583:11:239:0710:50
10:50
#20700
35K
21.75 mi14:15:523:18:179:076:54
9:13
#20648
23M
23.00 mi14:28:293:30:549:1012:37
10:05
#20691
24M
24.00 mi14:37:563:40:219:119:27
9:27
#20641
40K
24.85 mi14:46:463:49:119:138:50
10:20
#20701
25.2M
25.20 mi14:50:483:53:139:154:02
11:42
#20743
Finish
26.22 mi15:00:474:03:129:179:59
9:48
#20797
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi206237872787220539(Top 72%)7738(Top 63%)7738(Top 594%)
10K6.21 mi3.10 mi21080-4578096-2248096-22421609(Top 76%)8372(Top 68%)8372(Top 643%)
15K9.32 mi3.11 mi20879+2017974+1227974+12220539(Top 72%)7738(Top 63%)7738(Top 594%)
20K12.43 mi3.11 mi20792+877924+507924+5020591(Top 72%)7829(Top 64%)7829(Top 601%)
Half13.11 mi0.68 mi20703+897875+497875+4918816(Top 66%)6810(Top 56%)6810(Top 523%)
25K15.53 mi2.42 mi20750-477904-297904-2920817(Top 73%)7988(Top 65%)7988(Top 613%)
30K18.64 mi3.11 mi20648+1027902+27902+220308(Top 71%)7828(Top 64%)7828(Top 601%)
20M20.00 mi1.36 mi20685-377934-327934-3221111(Top 74%)8417(Top 69%)8417(Top 646%)
21M21.00 mi1.00 mi20700-157959-257959-2520939(Top 74%)8421(Top 69%)8421(Top 646%)
35K21.75 mi0.75 mi20648+527948+117948+1119300(Top 68%)7609(Top 62%)7609(Top 584%)
23M23.00 mi1.25 mi20691-437997-497997-4920743(Top 73%)8427(Top 69%)8427(Top 647%)
24M24.00 mi1.00 mi20641+507981+167981+1619454(Top 68%)7804(Top 64%)7804(Top 599%)
40K24.85 mi0.85 mi20701-608028-478028-4721482(Top 76%)8916(Top 73%)8916(Top 684%)
25.2M25.20 mi0.35 mi20743-428066-388066-3822567(Top 79%)9443(Top 77%)9443(Top 725%)
Finish26.22 mi1.02 mi20797-548114-488114-4822276(Top 78%)9309(Top 76%)9309(Top 714%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 72%
×21story building
+97ft-345ft

Overall

20539

Females

7738

F50-54

7738

5K→10K

3.1 - 6.2 mi

Top 76%
×5story building
+79ft-138ft

Overall

21609

Females

8372

F50-54

8372

10K→15K

6.2 - 9.3 mi

Top 72%
×3story building
+67ft-78ft

Overall

20539

Females

7738

F50-54

7738

15K→20K

9.3 - 12.4 mi

Top 72%
×5story building
+106ft-86ft

Overall

20591

Females

7829

F50-54

7829

20K→Half

12.4 - 13.1 mi

Top 66%
×2story building
+19ft-37ft

Overall

18816

Females

6810

F50-54

6810

Half→25K

13.1 - 15.5 mi

Top 73%
×4story building
+66ft-88ft

Overall

20817

Females

7988

F50-54

7988

25K→30K

15.5 - 18.6 mi

Top 71%
×9story building
+181ft-148ft

Overall

20308

Females

7828

F50-54

7828

30K→20M

18.6 - 20.0 mi

Top 74%
×5story building
+64ft-50ft

Overall

21111

Females

8417

F50-54

8417

20M→21M

20.0 - 21.0 mi

Top 74%
×8story building
+106ft-24ft

Overall

20939

Females

8421

F50-54

8421

21M→35K

21.0 - 21.8 mi

Top 68%
×7story building
+17ft-86ft

Overall

19300

Females

7609

F50-54

7609

35K→23M

21.8 - 23.0 mi

Top 73%
×5story building
+23ft-63ft

Overall

20743

Females

8427

F50-54

8427

23M→24M

23.0 - 24.0 mi

Top 68%
×6story building
+12ft-82ft

Overall

19454

Females

7804

F50-54

7804

24M→40K

24.0 - 24.9 mi

Top 76%
×1story
+6ft-20ft

Overall

21482

Females

8916

F50-54

8916

40K→25.2M

24.9 - 25.2 mi

Top 79%
×1story
+13ft-16ft

Overall

22567

Females

9443

F50-54

9443

25.2M→Finish

25.2 - 26.2 mi

Top 78%
×2story building
+22ft-21ft

Overall

22276

Females

9309

F50-54

9309

Passing Analysis

Category:
Athletes Passed
1607
Passed By
1781
Net Change
-174
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20623
5K → 10K106563-457#20623#21080
10K → 15K28988+201#21080#20879
15K → 20K227140+87#20879#20792
20K → Half923+89#20792#20703
Half → 25K140187-47#20703#20750
25K → 30K265163+102#20750#20648
30K → 20M91128-37#20648#20685
20M → 21M90105-15#20685#20700
21M → 35K7321+52#20700#20648
35K → 23M77120-43#20648#20691
23M → 24M8434+50#20691#20641
24M → 40K3393-60#20641#20701
40K → 25.2M1658-42#20701#20743
25.2M → Finish2478-54#20743#20797
TOTALS16071781-174
📊

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing