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BOSTON MARATHON 2025

Xiaomei Zhou

Bib: 21108•F

MA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 50%
Gender (Female)
#0 / 12228
Top 36%
Masters (Masters Women)
#0 / 6759
Top 21%
Division (F45-49)
#0 / 1813
Top 25%
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
8:06/mi
25:09
↑ 97↓ 3451.5%
10K· 6.21 mi
8:03/mi
50:11
↑ 79↓ 1380.4%
15K· 9.32 mi
8:03/mi
1:15:11
↑ 67↓ 78
20K· 12.43 mi
8:09/mi
1:40:29
↑ 106↓ 860.1%
Half· 13.11 mi
7:45/mi
1:45:46
↑ 19↓ 370.5%
25K· 15.53 mi
8:03/mi
2:05:16
↑ 66↓ 880.2%
30K· 18.64 mi
8:15/mi
2:30:53
↑ 181↓ 1480.2%
20M
8:23/mi
2:42:17
↑ 64↓ 500.2%
21M
8:47/mi
2:51:04
↑ 106↓ 241.6%
35K· 21.75 mi
8:13/mi
2:57:13
↑ 17↓ 861.7%
23M
8:20/mi
3:07:39
↑ 23↓ 630.6%
24M
7:58/mi
3:15:37
↓ 821.3%
40K· 24.85 mi
7:58/mi
3:22:26
↓ 200.3%
25.2M
8:39/mi
3:25:25
↑ 13↓ 160.2%
Finish· 26.22 mi
7:41/mi
3:33:15
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:45:46
Pace8:04 /mi
2nd Half
Distance13.11 mi
Time1:47:29
Pace8:12 /mi
📊Positive Split: 1.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:3525:098:0625:09
8:06
-
10K
6.21 mi11:44:3750:118:0525:02
8:03
-0:03
15K
9.32 mi12:09:371:15:118:0425:00
8:03
0:00
20K
12.43 mi12:34:551:40:298:0525:18
8:09
+0:06
Half
13.11 mi12:40:121:45:468:045:17
7:45
-0:24
25K
15.53 mi12:59:422:05:168:0419:30
8:03
+0:18
30K
18.64 mi13:25:192:30:538:0625:37
8:15
+0:12
20M
20.00 mi13:36:432:42:178:0711:24
8:23
+0:08
21M
21.00 mi13:45:302:51:048:098:47
8:47
+0:24
35K
21.75 mi13:51:392:57:138:096:09
8:13
-0:34
23M
23.00 mi14:02:053:07:398:1010:26
8:20
+0:07
24M
24.00 mi14:10:033:15:378:097:58
7:58
-0:22
40K
24.85 mi14:16:523:22:268:096:49
7:58
0:00
25.2M
25.20 mi14:19:513:25:258:092:59
8:39
+0:41
Finish
26.22 mi14:27:413:33:158:087:50
7:41
-0:58

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

8:08 /mi

Slowest Pace

8:47 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:21:29

94% of race

Time at Steady Pace

11:46

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:08 /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 mi11:19:3525:098:0625:09
8:06
#17317
10K
6.21 mi11:44:3750:118:0525:02
8:03
#17083
15K
9.32 mi12:09:371:15:118:0425:00
8:03
#16821
20K
12.43 mi12:34:551:40:298:0525:18
8:09
#16572
Half
13.11 mi12:40:121:45:468:045:17
7:45
#16443
25K
15.53 mi12:59:422:05:168:0419:30
8:03
#16053
30K
18.64 mi13:25:192:30:538:0625:37
8:15
#15460
20M
20.00 mi13:36:432:42:178:0711:24
8:23
#15252
21M
21.00 mi13:45:302:51:048:098:47
8:47
#14996
35K
21.75 mi13:51:392:57:138:096:09
8:13
#14937
23M
23.00 mi14:02:053:07:398:1010:26
8:20
#14726
24M
24.00 mi14:10:033:15:378:097:58
7:58
#14550
40K
24.85 mi14:16:523:22:268:096:49
7:58
#14353
25.2M
25.20 mi14:19:513:25:258:092:59
8:39
#14273
Finish
26.22 mi14:27:413:33:158:087:50
7:41
#14110
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi173175922592216387(Top 58%)5368(Top 44%)5368(Top 296%)
10K6.21 mi3.10 mi17083+2345772+1505772+15016895(Top 59%)5640(Top 46%)5640(Top 311%)
15K9.32 mi3.11 mi16821+2625621+1515621+15116387(Top 58%)5368(Top 44%)5368(Top 296%)
20K12.43 mi3.11 mi16572+2495481+1405481+14015939(Top 56%)5175(Top 42%)5175(Top 285%)
Half13.11 mi0.68 mi16443+1295399+825399+8213854(Top 49%)3993(Top 33%)3993(Top 220%)
25K15.53 mi2.42 mi16053+3905190+2095190+20914239(Top 50%)4332(Top 35%)4332(Top 239%)
30K18.64 mi3.11 mi15460+5934924+2664924+26613153(Top 46%)3922(Top 32%)3922(Top 216%)
20M20.00 mi1.36 mi15252+2084834+904834+9013107(Top 46%)4042(Top 33%)4042(Top 223%)
21M21.00 mi1.00 mi14996+2564717+1174717+11712234(Top 43%)3731(Top 31%)3731(Top 206%)
35K21.75 mi0.75 mi14937+594699+184699+1813787(Top 49%)4567(Top 37%)4567(Top 252%)
23M23.00 mi1.25 mi14726+2114613+864613+8612265(Top 43%)3890(Top 32%)3890(Top 215%)
24M24.00 mi1.00 mi14550+1764539+744539+7411049(Top 39%)3339(Top 27%)3339(Top 184%)
40K24.85 mi0.85 mi14353+1974471+684471+6810060(Top 35%)2972(Top 24%)2972(Top 164%)
25.2M25.20 mi0.35 mi14273+804432+394432+399840(Top 35%)2966(Top 24%)2966(Top 164%)
Finish26.22 mi1.02 mi14110+1634373+594373+5910657(Top 38%)3302(Top 27%)3302(Top 182%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 58%
×21story building
+97ft-345ft

Overall

16387

Females

5368

F45-49

5368

5K→10K

3.1 - 6.2 mi

Top 59%
×5story building
+79ft-138ft

Overall

16895

Females

5640

F45-49

5640

10K→15K

6.2 - 9.3 mi

Top 58%
×3story building
+67ft-78ft

Overall

16387

Females

5368

F45-49

5368

15K→20K

9.3 - 12.4 mi

Top 56%
×5story building
+106ft-86ft

Overall

15939

Females

5175

F45-49

5175

20K→Half

12.4 - 13.1 mi

Top 49%
×2story building
+19ft-37ft

Overall

13854

Females

3993

F45-49

3993

Half→25K

13.1 - 15.5 mi

Top 50%
×4story building
+66ft-88ft

Overall

14239

Females

4332

F45-49

4332

25K→30K

15.5 - 18.6 mi

Top 46%
×9story building
+181ft-148ft

Overall

13153

Females

3922

F45-49

3922

30K→20M

18.6 - 20.0 mi

Top 46%
×5story building
+64ft-50ft

Overall

13107

Females

4042

F45-49

4042

20M→21M

20.0 - 21.0 mi

Top 43%
×8story building
+106ft-24ft

Overall

12234

Females

3731

F45-49

3731

21M→35K

21.0 - 21.8 mi

Top 49%
×7story building
+17ft-86ft

Overall

13787

Females

4567

F45-49

4567

35K→23M

21.8 - 23.0 mi

Top 43%
×5story building
+23ft-63ft

Overall

12265

Females

3890

F45-49

3890

23M→24M

23.0 - 24.0 mi

Top 39%
×6story building
+12ft-82ft

Overall

11049

Females

3339

F45-49

3339

24M→40K

24.0 - 24.9 mi

Top 35%
×1story
+6ft-20ft

Overall

10060

Females

2972

F45-49

2972

40K→25.2M

24.9 - 25.2 mi

Top 35%
×1story
+13ft-16ft

Overall

9840

Females

2966

F45-49

2966

25.2M→Finish

25.2 - 26.2 mi

Top 38%
×2story building
+22ft-21ft

Overall

10657

Females

3302

F45-49

3302

Passing Analysis

Category:
Athletes Passed
3725
Passed By
518
Net Change
+3207
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17317
5K → 10K422188+234#17317#17083
10K → 15K35391+262#17083#16821
15K → 20K33485+249#16821#16572
20K → Half1323+129#16572#16443
Half → 25K40212+390#16443#16053
25K → 30K61421+593#16053#15460
30K → 20M23325+208#15460#15252
20M → 21M27014+256#15252#14996
21M → 35K8526+59#14996#14937
35K → 23M23524+211#14937#14726
23M → 24M18610+176#14726#14550
24M → 40K2014+197#14550#14353
40K → 25.2M811+80#14353#14273
25.2M → Finish17714+163#14273#14110
TOTALS3725518+3207
📊

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