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BOSTON MARATHON 2025

Chen Lo

Bib: 19388•F

CA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 38%
Gender (Female)
#0 / 12228
Top 21%
Masters (Masters Women)
#0 / 6759
Top 8%
Division (F40-44)
#0 / 1718
Top 18%
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
7:48/mi
24:13
↑ 97↓ 3451.5%
10K· 6.21 mi
7:43/mi
48:10
↑ 79↓ 1380.4%
15K· 9.32 mi
7:26/mi
1:11:16
↑ 67↓ 78
20K· 12.43 mi
7:26/mi
1:34:22
↑ 106↓ 860.1%
Half· 13.11 mi
7:14/mi
1:39:18
↑ 19↓ 370.5%
25K· 15.53 mi
7:24/mi
1:57:14
↑ 66↓ 880.2%
30K· 18.64 mi
7:38/mi
2:20:58
↑ 181↓ 1480.2%
20M
7:33/mi
2:31:14
↑ 64↓ 500.2%
21M
8:45/mi
2:39:59
↑ 106↓ 241.6%
35K· 21.75 mi
7:16/mi
2:45:25
↑ 17↓ 861.7%
23M
7:58/mi
2:55:23
↑ 23↓ 630.6%
24M
7:43/mi
3:03:06
↓ 821.3%
40K· 24.85 mi
8:15/mi
3:10:09
↓ 200.3%
25.2M
8:35/mi
3:13:07
↑ 13↓ 160.2%
Finish· 26.22 mi
8:35/mi
3:21:52
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:39:18
Pace7:34 /mi
2nd Half
Distance13.11 mi
Time1:42:34
Pace7:49 /mi
📊Positive Split: 3.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:18:3124:137:4824:13
7:48
-
10K
6.21 mi11:42:2848:107:4523:57
7:43
-0:05
15K
9.32 mi12:05:341:11:167:3923:06
7:26
-0:17
20K
12.43 mi12:28:401:34:227:3623:06
7:26
0:00
Half
13.11 mi12:33:361:39:187:344:56
7:14
-0:12
25K
15.53 mi12:51:321:57:147:3317:56
7:24
+0:10
30K
18.64 mi13:15:162:20:587:3423:44
7:38
+0:14
20M
20.00 mi13:25:322:31:147:3410:16
7:33
-0:05
21M
21.00 mi13:34:172:39:597:378:45
8:45
+1:12
35K
21.75 mi13:39:432:45:257:365:26
7:16
-1:29
23M
23.00 mi13:49:412:55:237:389:58
7:58
+0:42
24M
24.00 mi13:57:243:03:067:387:43
7:43
-0:15
40K
24.85 mi14:04:273:10:097:397:03
8:15
+0:32
25.2M
25.20 mi14:07:253:13:077:402:58
8:35
+0:20
Finish
26.22 mi14:16:103:21:527:428:45
8:35
0:00

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

7:14 /mi

Average Pace

7:42 /mi

Slowest Pace

8:45 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:14:30

37% of race

Time at Steady Pace

1:29:53

45% of race

Time at Slower Pace

37:29

19% of race

Average Pace: 7:42 /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 mi11:18:3124:137:4824:13
7:48
#14765
10K
6.21 mi11:42:2848:107:4523:57
7:43
#14333
15K
9.32 mi12:05:341:11:167:3923:06
7:26
#13286
20K
12.43 mi12:28:401:34:227:3623:06
7:26
#12441
Half
13.11 mi12:33:361:39:187:344:56
7:14
#12291
25K
15.53 mi12:51:321:57:147:3317:56
7:24
#11730
30K
18.64 mi13:15:162:20:587:3423:44
7:38
#11138
20M
20.00 mi13:25:322:31:147:3410:16
7:33
#10784
21M
21.00 mi13:34:172:39:597:378:45
8:45
#10823
35K
21.75 mi13:39:432:45:257:365:26
7:16
#10659
23M
23.00 mi13:49:412:55:237:389:58
7:58
#10555
24M
24.00 mi13:57:243:03:067:387:43
7:43
#10475
40K
24.85 mi14:04:273:10:097:397:03
8:15
#10490
25.2M
25.20 mi14:07:253:13:077:402:58
8:35
#10446
Finish
26.22 mi14:16:103:21:527:428:45
8:35
#10688
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi147654386438611206(Top 39%)2479(Top 20%)2479(Top 144%)
10K6.21 mi3.10 mi14333+4324137+2494137+24913971(Top 49%)3940(Top 32%)3940(Top 229%)
15K9.32 mi3.11 mi13286+10473562+5753562+57511206(Top 39%)2479(Top 20%)2479(Top 144%)
20K12.43 mi3.11 mi12441+8453111+4513111+45110221(Top 36%)2070(Top 17%)2070(Top 120%)
Half13.11 mi0.68 mi12291+1503035+763035+769481(Top 33%)1724(Top 14%)1724(Top 100%)
25K15.53 mi2.42 mi11730+5612772+2632772+2639159(Top 32%)1715(Top 14%)1715(Top 100%)
30K18.64 mi3.11 mi11138+5922537+2352537+2358765(Top 31%)1735(Top 14%)1735(Top 101%)
20M20.00 mi1.36 mi10784+3542401+1362401+1367424(Top 26%)1319(Top 11%)1319(Top 77%)
21M21.00 mi1.00 mi10823-392460-592460-5911988(Top 42%)3581(Top 29%)3581(Top 208%)
35K21.75 mi0.75 mi10659+1642389+712389+717054(Top 25%)1327(Top 11%)1327(Top 77%)
23M23.00 mi1.25 mi10555+1042378+112378+119764(Top 34%)2620(Top 21%)2620(Top 153%)
24M24.00 mi1.00 mi10475+802373+52373+59246(Top 33%)2444(Top 20%)2444(Top 142%)
40K24.85 mi0.85 mi10490-152409-362409-3611841(Top 42%)3828(Top 31%)3828(Top 223%)
25.2M25.20 mi0.35 mi10446+442407+22407+29279(Top 33%)2716(Top 22%)2716(Top 158%)
Finish26.22 mi1.02 mi10688-2422568-1612568-16116811(Top 59%)6472(Top 53%)6472(Top 377%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 39%
×21story building
+97ft-345ft

Overall

11206

Females

2479

F40-44

2479

5K→10K

3.1 - 6.2 mi

Top 49%
×5story building
+79ft-138ft

Overall

13971

Females

3940

F40-44

3940

10K→15K

6.2 - 9.3 mi

Top 39%
×3story building
+67ft-78ft

Overall

11206

Females

2479

F40-44

2479

15K→20K

9.3 - 12.4 mi

Top 36%
×5story building
+106ft-86ft

Overall

10221

Females

2070

F40-44

2070

20K→Half

12.4 - 13.1 mi

Top 33%
×2story building
+19ft-37ft

Overall

9481

Females

1724

F40-44

1724

Half→25K

13.1 - 15.5 mi

Top 32%
×4story building
+66ft-88ft

Overall

9159

Females

1715

F40-44

1715

25K→30K

15.5 - 18.6 mi

Top 31%
×9story building
+181ft-148ft

Overall

8765

Females

1735

F40-44

1735

30K→20M

18.6 - 20.0 mi

Top 26%
×5story building
+64ft-50ft

Overall

7424

Females

1319

F40-44

1319

20M→21M

20.0 - 21.0 mi

Top 42%
×8story building
+106ft-24ft

Overall

11988

Females

3581

F40-44

3581

21M→35K

21.0 - 21.8 mi

Top 25%
×7story building
+17ft-86ft

Overall

7054

Females

1327

F40-44

1327

35K→23M

21.8 - 23.0 mi

Top 34%
×5story building
+23ft-63ft

Overall

9764

Females

2620

F40-44

2620

23M→24M

23.0 - 24.0 mi

Top 33%
×6story building
+12ft-82ft

Overall

9246

Females

2444

F40-44

2444

24M→40K

24.0 - 24.9 mi

Top 42%
×1story
+6ft-20ft

Overall

11841

Females

3828

F40-44

3828

40K→25.2M

24.9 - 25.2 mi

Top 33%
×1story
+13ft-16ft

Overall

9279

Females

2716

F40-44

2716

25.2M→Finish

25.2 - 26.2 mi

Top 59%
×2story building
+22ft-21ft

Overall

16811

Females

6472

F40-44

6472

Passing Analysis

Category:
Athletes Passed
4821
Passed By
744
Net Change
+4077
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#14765
5K → 10K561129+432#14765#14333
10K → 15K10492+1047#14333#13286
15K → 20K8483+845#13286#12441
20K → Half1511+150#12441#12291
Half → 25K5665+561#12291#11730
25K → 30K61624+592#11730#11138
30K → 20M3573+354#11138#10784
20M → 21M84123-39#10784#10823
21M → 35K1684+164#10823#10659
35K → 23M15248+104#10659#10555
23M → 24M12343+80#10555#10475
24M → 40K6176-15#10475#10490
40K → 25.2M6319+44#10490#10446
25.2M → Finish22264-242#10446#10688
TOTALS4821744+4077
📊

Passing Visuals

Category:
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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