Boston Marathon logo
BOSTON MARATHON 2025

Joon Hee Shim

Bib: 23827•F

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
8:42/mi
27:01
↑ 97↓ 3451.5%
10K· 6.21 mi
9:20/mi
56:01
↑ 79↓ 1380.4%
15K· 9.32 mi
10:02/mi
1:27:10
↑ 67↓ 78
20K· 12.43 mi
10:43/mi
2:00:27
↑ 106↓ 860.1%
Half· 13.11 mi
10:07/mi
2:07:21
↑ 19↓ 370.5%
25K· 15.53 mi
11:15/mi
2:34:37
↑ 66↓ 880.2%
30K· 18.64 mi
12:18/mi
3:12:51
↑ 181↓ 1480.2%
20M
12:59/mi
3:30:30
↑ 64↓ 500.2%
21M
14:58/mi
3:45:28
↑ 106↓ 241.6%
35K· 21.75 mi
11:03/mi
3:53:44
↑ 17↓ 861.7%
23M
12:42/mi
4:09:38
↑ 23↓ 630.6%
24M
13:07/mi
4:22:45
↓ 821.3%
40K· 24.85 mi
13:05/mi
4:33:56
↓ 200.3%
25.2M
13:26/mi
4:38:34
↑ 13↓ 160.2%
Finish· 26.22 mi
12:01/mi
4:50:49
↑ 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
Time2:07:21
Pace9:43 /mi
2nd Half
Distance13.11 mi
Time2:43:28
Pace12:28 /mi
📊Positive Split: 28.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:25:0827:018:4227:01
8:42
-
10K
6.21 mi11:54:0856:019:0129:00
9:20
+0:38
15K
9.32 mi12:25:171:27:109:2131:09
10:02
+0:42
20K
12.43 mi12:58:342:00:279:4233:17
10:43
+0:41
Half
13.11 mi13:05:282:07:219:436:54
10:07
-0:36
25K
15.53 mi13:32:442:34:379:5727:16
11:15
+1:08
30K
18.64 mi14:10:583:12:5110:2138:14
12:18
+1:03
20M
20.00 mi14:28:373:30:3010:3117:39
12:59
+0:41
21M
21.00 mi14:43:353:45:2810:4414:58
14:58
+1:59
35K
21.75 mi14:51:513:53:4410:458:16
11:03
-3:55
23M
23.00 mi15:07:454:09:3810:5115:54
12:42
+1:39
24M
24.00 mi15:20:524:22:4510:5713:07
13:07
+0:25
40K
24.85 mi15:32:034:33:5611:0111:11
13:05
-0:02
25.2M
25.20 mi15:36:414:38:3411:034:38
13:26
+0:21
Finish
26.22 mi15:48:564:50:4911:0612:15
12:01
-1:25

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

8:42 /mi

Average Pace

11:06 /mi

Slowest Pace

14:58 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:15:37

47% of race

Time at Steady Pace

1:33:39

32% of race

Time at Slower Pace

1:01:33

21% of race

Average Pace: 11:05 /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 mi11:25:0827:018:4227:01
8:42
#20979
10K
6.21 mi11:54:0856:019:0129:00
9:20
#22485
15K
9.32 mi12:25:171:27:109:2131:09
10:02
#23605
20K
12.43 mi12:58:342:00:279:4233:17
10:43
#24283
Half
13.11 mi13:05:282:07:219:436:54
10:07
#24319
25K
15.53 mi13:32:442:34:379:5727:16
11:15
#24616
30K
18.64 mi14:10:583:12:5110:2138:14
12:18
#24965
20M
20.00 mi14:28:373:30:3010:3117:39
12:59
#25112
21M
21.00 mi14:43:353:45:2810:4414:58
14:58
#25276
35K
21.75 mi14:51:513:53:4410:458:16
11:03
#25261
23M
23.00 mi15:07:454:09:3810:5115:54
12:42
#25323
24M
24.00 mi15:20:524:22:4510:5713:07
13:07
#25413
40K
24.85 mi15:32:034:33:5611:0111:11
13:05
#25476
25.2M
25.20 mi15:36:414:38:3411:034:38
13:26
#25485
Finish
26.22 mi15:48:564:50:4911:0612:15
12:01
#25571
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi209798074807425038(Top 88%)10235(Top 84%)10235(Top 785%)
10K6.21 mi3.10 mi22485-15068882-8088882-80823620(Top 83%)9478(Top 78%)9478(Top 727%)
15K9.32 mi3.11 mi23605-11209465-5839465-58325038(Top 88%)10235(Top 84%)10235(Top 785%)
20K12.43 mi3.11 mi24283-6789851-3869851-38625556(Top 90%)10571(Top 86%)10571(Top 811%)
Half13.11 mi0.68 mi24319-369881-309881-3025042(Top 88%)10289(Top 84%)10289(Top 790%)
25K15.53 mi2.42 mi24616-29710042-16110042-16125540(Top 90%)10596(Top 87%)10596(Top 813%)
30K18.64 mi3.11 mi24965-34910261-21910261-21925939(Top 91%)10910(Top 89%)10910(Top 837%)
20M20.00 mi1.36 mi25112-14710351-9010351-9026428(Top 93%)11245(Top 92%)11245(Top 863%)
21M21.00 mi1.00 mi25276-16410465-11410465-11427112(Top 95%)11622(Top 95%)11622(Top 892%)
35K21.75 mi0.75 mi25261+1510458+710458+724290(Top 86%)10218(Top 84%)10218(Top 784%)
23M23.00 mi1.25 mi25323-6210506-4810506-4826034(Top 92%)11110(Top 91%)11110(Top 853%)
24M24.00 mi1.00 mi25413-9010570-6410570-6426968(Top 95%)11618(Top 95%)11618(Top 892%)
40K24.85 mi0.85 mi25476-6310614-4410614-4426365(Top 93%)11322(Top 93%)11322(Top 869%)
25.2M25.20 mi0.35 mi25485-910623-910623-925560(Top 90%)10978(Top 90%)10978(Top 843%)
Finish26.22 mi1.02 mi25571-8610683-6010683-6026810(Top 94%)11533(Top 94%)11533(Top 885%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 88%
×21story building
+97ft-345ft

Overall

25038

Females

10235

F50-54

10235

5K→10K

3.1 - 6.2 mi

Top 83%
×5story building
+79ft-138ft

Overall

23620

Females

9478

F50-54

9478

10K→15K

6.2 - 9.3 mi

Top 88%
×3story building
+67ft-78ft

Overall

25038

Females

10235

F50-54

10235

15K→20K

9.3 - 12.4 mi

Top 90%
×5story building
+106ft-86ft

Overall

25556

Females

10571

F50-54

10571

20K→Half

12.4 - 13.1 mi

Top 88%
×2story building
+19ft-37ft

Overall

25042

Females

10289

F50-54

10289

Half→25K

13.1 - 15.5 mi

Top 90%
×4story building
+66ft-88ft

Overall

25540

Females

10596

F50-54

10596

25K→30K

15.5 - 18.6 mi

Top 91%
×9story building
+181ft-148ft

Overall

25939

Females

10910

F50-54

10910

30K→20M

18.6 - 20.0 mi

Top 93%
×5story building
+64ft-50ft

Overall

26428

Females

11245

F50-54

11245

20M→21M

20.0 - 21.0 mi

Top 95%
×8story building
+106ft-24ft

Overall

27112

Females

11622

F50-54

11622

21M→35K

21.0 - 21.8 mi

Top 86%
×7story building
+17ft-86ft

Overall

24290

Females

10218

F50-54

10218

35K→23M

21.8 - 23.0 mi

Top 92%
×5story building
+23ft-63ft

Overall

26034

Females

11110

F50-54

11110

23M→24M

23.0 - 24.0 mi

Top 95%
×6story building
+12ft-82ft

Overall

26968

Females

11618

F50-54

11618

24M→40K

24.0 - 24.9 mi

Top 93%
×1story
+6ft-20ft

Overall

26365

Females

11322

F50-54

11322

40K→25.2M

24.9 - 25.2 mi

Top 90%
×1story
+13ft-16ft

Overall

25560

Females

10978

F50-54

10978

25.2M→Finish

25.2 - 26.2 mi

Top 94%
×2story building
+22ft-21ft

Overall

26810

Females

11533

F50-54

11533

Passing Analysis

Category:
Athletes Passed
300
Passed By
4892
Net Change
-4592
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20979
5K → 10K221528-1506#20979#22485
10K → 15K241144-1120#22485#23605
15K → 20K18696-678#23605#24283
20K → Half1147-36#24283#24319
Half → 25K35332-297#24319#24616
25K → 30K48397-349#24616#24965
30K → 20M23170-147#24965#25112
20M → 21M13177-164#25112#25276
21M → 35K3318+15#25276#25261
35K → 23M2183-62#25261#25323
23M → 24M16106-90#25323#25413
24M → 40K1780-63#25413#25476
40K → 25.2M918-9#25476#25485
25.2M → Finish1096-86#25485#25571
TOTALS3004892-4592
📊

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