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BOSTON MARATHON 2025

Na Zeng Greenwood

Bib: 21218•F

CA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F45-49)
#0 / 1813
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
8:37/mi
26:47
↑ 97↓ 3451.5%
10K· 6.21 mi
8:17/mi
52:30
↑ 79↓ 1380.4%
15K· 9.32 mi
8:17/mi
1:18:13
↑ 67↓ 78
20K· 12.43 mi
8:39/mi
1:45:07
↑ 106↓ 860.1%
Half· 13.11 mi
8:43/mi
1:51:04
↑ 19↓ 370.5%
25K· 15.53 mi
10:06/mi
2:15:34
↑ 66↓ 880.2%
30K· 18.64 mi
11:49/mi
2:52:18
↑ 181↓ 1480.2%
20M
10:36/mi
3:06:42
↑ 64↓ 500.2%
21M
15:59/mi
3:22:41
↑ 106↓ 241.6%
35K· 21.75 mi
10:04/mi
3:30:13
↑ 17↓ 861.7%
23M
11:05/mi
3:44:06
↑ 23↓ 630.6%
24M
10:33/mi
3:54:39
↓ 821.3%
40K· 24.85 mi
10:49/mi
4:03:54
↓ 200.3%
25.2M
11:39/mi
4:07:55
↑ 13↓ 160.2%
Finish· 26.22 mi
10:18/mi
4:18:25
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:51:04
Pace8:28 /mi
2nd Half
Distance13.11 mi
Time2:27:21
Pace11:14 /mi
📊Positive Split: 32.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:4026:478:3726:47
8:37
-
10K
6.21 mi11:45:2352:308:2725:43
8:17
-0:20
15K
9.32 mi12:11:061:18:138:2425:43
8:17
0:00
20K
12.43 mi12:38:001:45:078:2826:54
8:39
+0:22
Half
13.11 mi12:43:571:51:048:285:57
8:43
+0:04
25K
15.53 mi13:08:272:15:348:4424:30
10:06
+1:23
30K
18.64 mi13:45:112:52:189:1536:44
11:49
+1:43
20M
20.00 mi13:59:353:06:429:2014:24
10:36
-1:13
21M
21.00 mi14:15:343:22:419:3915:59
15:59
+5:23
35K
21.75 mi14:23:063:30:139:407:32
10:04
-5:55
23M
23.00 mi14:36:593:44:069:4513:53
11:05
+1:01
24M
24.00 mi14:47:323:54:399:4710:33
10:33
-0:32
40K
24.85 mi14:56:474:03:549:499:15
10:49
+0:16
25.2M
25.20 mi15:00:484:07:559:504:01
11:39
+0:50
Finish
26.22 mi15:11:184:18:259:5210:30
10:18
-1:21

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

8:17 /mi

Average Pace

9:52 /mi

Slowest Pace

15:59 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:51:04

43% of race

Time at Steady Pace

1:30:37

35% of race

Time at Slower Pace

56:44

22% of race

Average Pace: 9:51 /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 mi11:19:4026:478:3726:47
8:37
#20588
10K
6.21 mi11:45:2352:308:2725:43
8:17
#19538
15K
9.32 mi12:11:061:18:138:2425:43
8:17
#18981
20K
12.43 mi12:38:001:45:078:2826:54
8:39
#19006
Half
13.11 mi12:43:571:51:048:285:57
8:43
#19085
25K
15.53 mi13:08:272:15:348:4424:30
10:06
#20231
30K
18.64 mi13:45:112:52:189:1536:44
11:49
#21949
20M
20.00 mi13:59:353:06:429:2014:24
10:36
#22021
21M
21.00 mi14:15:343:22:419:3915:59
15:59
#22728
35K
21.75 mi14:23:063:30:139:407:32
10:04
#22690
23M
23.00 mi14:36:593:44:069:4513:53
11:05
#22743
24M
24.00 mi14:47:323:54:399:4710:33
10:33
#22719
40K
24.85 mi14:56:474:03:549:499:15
10:49
#22704
25.2M
25.20 mi15:00:484:07:559:504:01
11:39
#22710
Finish
26.22 mi15:11:184:18:259:5210:30
10:18
#22758
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi205887858785817915(Top 63%)6268(Top 51%)6268(Top 346%)
10K6.21 mi3.10 mi19538+10507206+6527206+65218419(Top 65%)6554(Top 54%)6554(Top 362%)
15K9.32 mi3.11 mi18981+5576902+3046902+30417915(Top 63%)6268(Top 51%)6268(Top 346%)
20K12.43 mi3.11 mi19006-256910-86910-819203(Top 68%)7028(Top 57%)7028(Top 388%)
Half13.11 mi0.68 mi19085-796955-456955-4520561(Top 72%)7809(Top 64%)7809(Top 431%)
25K15.53 mi2.42 mi20231-11467625-6707625-67023523(Top 83%)9492(Top 78%)9492(Top 524%)
30K18.64 mi3.11 mi21949-17188595-9708595-97025352(Top 89%)10587(Top 87%)10587(Top 584%)
20M20.00 mi1.36 mi22021-728651-568651-5622697(Top 80%)9248(Top 76%)9248(Top 510%)
21M21.00 mi1.00 mi22728-7079075-4249075-42427800(Top 98%)11955(Top 98%)11955(Top 659%)
35K21.75 mi0.75 mi22690+389069+69069+622113(Top 78%)9092(Top 74%)9092(Top 501%)
23M23.00 mi1.25 mi22743-539121-529121-5223438(Top 83%)9820(Top 80%)9820(Top 542%)
24M24.00 mi1.00 mi22719+249130-99130-922959(Top 81%)9613(Top 79%)9613(Top 530%)
40K24.85 mi0.85 mi22704+159140-109140-1022728(Top 80%)9568(Top 78%)9568(Top 528%)
25.2M25.20 mi0.35 mi22710-69150-109150-1022468(Top 79%)9391(Top 77%)9391(Top 518%)
Finish26.22 mi1.02 mi22758-489196-469196-4623818(Top 84%)10080(Top 82%)10080(Top 556%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21story building
+97ft-345ft

Overall

17915

Females

6268

F45-49

6268

5K→10K

3.1 - 6.2 mi

Top 65%
×5story building
+79ft-138ft

Overall

18419

Females

6554

F45-49

6554

10K→15K

6.2 - 9.3 mi

Top 63%
×3story building
+67ft-78ft

Overall

17915

Females

6268

F45-49

6268

15K→20K

9.3 - 12.4 mi

Top 68%
×5story building
+106ft-86ft

Overall

19203

Females

7028

F45-49

7028

20K→Half

12.4 - 13.1 mi

Top 72%
×2story building
+19ft-37ft

Overall

20561

Females

7809

F45-49

7809

Half→25K

13.1 - 15.5 mi

Top 83%
×4story building
+66ft-88ft

Overall

23523

Females

9492

F45-49

9492

25K→30K

15.5 - 18.6 mi

Top 89%
×9story building
+181ft-148ft

Overall

25352

Females

10587

F45-49

10587

30K→20M

18.6 - 20.0 mi

Top 80%
×5story building
+64ft-50ft

Overall

22697

Females

9248

F45-49

9248

20M→21M

20.0 - 21.0 mi

Top 98%
×8story building
+106ft-24ft

Overall

27800

Females

11955

F45-49

11955

21M→35K

21.0 - 21.8 mi

Top 78%
×7story building
+17ft-86ft

Overall

22113

Females

9092

F45-49

9092

35K→23M

21.8 - 23.0 mi

Top 83%
×5story building
+23ft-63ft

Overall

23438

Females

9820

F45-49

9820

23M→24M

23.0 - 24.0 mi

Top 81%
×6story building
+12ft-82ft

Overall

22959

Females

9613

F45-49

9613

24M→40K

24.0 - 24.9 mi

Top 80%
×1story
+6ft-20ft

Overall

22728

Females

9568

F45-49

9568

40K→25.2M

24.9 - 25.2 mi

Top 79%
×1story
+13ft-16ft

Overall

22468

Females

9391

F45-49

9391

25.2M→Finish

25.2 - 26.2 mi

Top 84%
×2story building
+22ft-21ft

Overall

23818

Females

10080

F45-49

10080

Passing Analysis

Category:
Athletes Passed
2293
Passed By
4463
Net Change
-2170
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20588
5K → 10K108737+1050#20588#19538
10K → 15K59538+557#19538#18981
15K → 20K195220-25#18981#19006
20K → Half1190-79#19006#19085
Half → 25K191165-1146#19085#20231
25K → 30K191737-1718#20231#21949
30K → 20M69141-72#21949#22021
20M → 21M6713-707#22021#22728
21M → 35K6931+38#22728#22690
35K → 23M54107-53#22690#22743
23M → 24M6440+24#22743#22719
24M → 40K5742+15#22719#22704
40K → 25.2M1521-6#22704#22710
25.2M → Finish3381-48#22710#22758
TOTALS22934463-2170
📊

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