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BOSTON MARATHON 2025

Crystal Zemlin

Bib: 13301•F

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0:00
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 46%
Division (F18-39)
#0 / 5469
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:32
Rank: #12918
Start → 5K
23:32 | 7:34/mi
10K· 6.21 mi
48:45
Rank: #15217 (-2299)
5K → 10K
25:13 | 8:07/mi
15K· 9.32 mi
1:14:36
Rank: #16367 (-1150)
10K → 15K
25:51 | 8:19/mi
20K· 12.43 mi
1:41:01
Rank: #16888 (-521)
15K → 20K
26:25 | 8:30/mi
Half· 13.11 mi
1:46:31
Rank: #16862 (+26)
20K → Half
5:30 | 8:04/mi
25K· 15.53 mi
2:07:34
Rank: #17031 (-169)
Half → 25K
21:03 | 8:41/mi
30K· 18.64 mi
2:35:44
Rank: #17161 (-130)
25K → 30K
28:10 | 9:04/mi
20M
2:48:15
Rank: #17211 (-50)
30K → 20M
12:31 | 9:13/mi
21M
2:57:33
Rank: #17057 (+154)
20M → 21M
9:18 | 9:18/mi
35K· 21.75 mi
3:04:01
Rank: #17019 (+38)
21M → 35K
6:28 | 8:39/mi
23M
3:14:39
Rank: #16771 (+248)
35K → 23M
10:38 | 8:30/mi
24M
3:23:10
Rank: #16658 (+113)
23M → 24M
8:31 | 8:31/mi
40K· 24.85 mi
3:30:40
Rank: #16580 (+78)
24M → 40K
7:30 | 8:46/mi
25.2M
3:33:55
Rank: #16540 (+40)
40K → 25.2M
3:15 | 9:25/mi
Finish· 26.22 mi
3:41:52
Rank: #16334 (+206)
25.2M → Finish
7:57 | 7:48/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:46:31
Pace8:08 /mi
2nd Half
Distance13.11 mi
Time1:55:21
Pace8:48 /mi
📊Positive Split: 8.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:0723:327:3423:32
7:34
-
10K
6.21 mi11:18:2048:457:5125:13
8:07
+0:33
15K
9.32 mi11:44:111:14:368:0025:51
8:19
+0:12
20K
12.43 mi12:10:361:41:018:0826:25
8:30
+0:11
Half
13.11 mi12:16:061:46:318:085:30
8:04
-0:26
25K
15.53 mi12:37:092:07:348:1321:03
8:41
+0:37
30K
18.64 mi13:05:192:35:448:2128:10
9:04
+0:23
20M
20.00 mi13:17:502:48:158:2512:31
9:13
+0:09
21M
21.00 mi13:27:082:57:338:279:18
9:18
+0:05
35K
21.75 mi13:33:363:04:018:286:28
8:39
-0:39
23M
23.00 mi13:44:143:14:398:2810:38
8:30
-0:09
24M
24.00 mi13:52:453:23:108:288:31
8:31
+0:01
40K
24.85 mi14:00:153:30:408:297:30
8:46
+0:15
25.2M
25.20 mi14:03:303:33:558:293:15
9:25
+0:39
Finish
26.22 mi14:11:273:41:528:287:57
7:48
-1:37

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

7:34 /mi

Average Pace

8:28 /mi

Slowest Pace

9:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:02:12

28% of race

Time at Steady Pace

1:46:26

48% of race

Time at Slower Pace

53:14

24% of race

Average Pace: 8:28 /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 mi10:53:0723:327:3423:32
7:34
#12918
10K
6.21 mi11:18:2048:457:5125:13
8:07
#15217
15K
9.32 mi11:44:111:14:368:0025:51
8:19
#16367
20K
12.43 mi12:10:361:41:018:0826:25
8:30
#16888
Half
13.11 mi12:16:061:46:318:085:30
8:04
#16862
25K
15.53 mi12:37:092:07:348:1321:03
8:41
#17031
30K
18.64 mi13:05:192:35:448:2128:10
9:04
#17161
20M
20.00 mi13:17:502:48:158:2512:31
9:13
#17211
21M
21.00 mi13:27:082:57:338:279:18
9:18
#17057
35K
21.75 mi13:33:363:04:018:286:28
8:39
#17019
23M
23.00 mi13:44:143:14:398:2810:38
8:30
#16771
24M
24.00 mi13:52:453:23:108:288:31
8:31
#16658
40K
24.85 mi14:00:153:30:408:297:30
8:46
#16580
25.2M
25.20 mi14:03:303:33:558:293:15
9:25
#16540
Finish
26.22 mi14:11:273:41:528:287:57
7:48
#16334
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi129183277327718191(Top 64%)6431(Top 53%)6431(Top 118%)
10K6.21 mi3.10 mi15217-22994673-13964673-139617332(Top 61%)5899(Top 48%)5899(Top 108%)
15K9.32 mi3.11 mi16367-11505355-6825355-68218191(Top 64%)6431(Top 53%)6431(Top 118%)
20K12.43 mi3.11 mi16888-5215674-3195674-31918263(Top 64%)6479(Top 53%)6479(Top 118%)
Half13.11 mi0.68 mi16862+265652+225652+2216434(Top 58%)5439(Top 44%)5439(Top 99%)
25K15.53 mi2.42 mi17031-1695783-1315783-13118284(Top 64%)6575(Top 54%)6575(Top 120%)
30K18.64 mi3.11 mi17161-1305912-1295912-12918011(Top 63%)6574(Top 54%)6574(Top 120%)
20M20.00 mi1.36 mi17211-505974-625974-6217834(Top 63%)6608(Top 54%)6608(Top 121%)
21M21.00 mi1.00 mi17057+1545911+635911+6315169(Top 53%)5273(Top 43%)5273(Top 96%)
35K21.75 mi0.75 mi17019+385910+15910+116357(Top 58%)5977(Top 49%)5977(Top 109%)
23M23.00 mi1.25 mi16771+2485794+1165794+11613301(Top 47%)4439(Top 36%)4439(Top 81%)
24M24.00 mi1.00 mi16658+1135747+475747+4714646(Top 52%)5182(Top 42%)5182(Top 95%)
40K24.85 mi0.85 mi16580+785735+125735+1215054(Top 53%)5549(Top 45%)5549(Top 101%)
25.2M25.20 mi0.35 mi16540+405722+135722+1314240(Top 50%)5160(Top 42%)5160(Top 94%)
Finish26.22 mi1.02 mi16334+2065626+965626+9611498(Top 40%)3715(Top 30%)3715(Top 68%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 64%
×21stories
+97ft-345ft

Overall

18191

Females

6431

F18-39

6431

5K→10K

3.1 - 6.2 mi

Top 61%
×5stories
+79ft-138ft

Overall

17332

Females

5899

F18-39

5899

10K→15K

6.2 - 9.3 mi

Top 64%
×3stories
+67ft-78ft

Overall

18191

Females

6431

F18-39

6431

15K→20K

9.3 - 12.4 mi

Top 64%
×5stories
+106ft-86ft

Overall

18263

Females

6479

F18-39

6479

20K→Half

12.4 - 13.1 mi

Top 58%
×2stories
+19ft-37ft

Overall

16434

Females

5439

F18-39

5439

Half→25K

13.1 - 15.5 mi

Top 64%
×4stories
+66ft-88ft

Overall

18284

Females

6575

F18-39

6575

25K→30K

15.5 - 18.6 mi

Top 63%
×9stories
+181ft-148ft

Overall

18011

Females

6574

F18-39

6574

30K→20M

18.6 - 20.0 mi

Top 63%
×5stories
+64ft-50ft

Overall

17834

Females

6608

F18-39

6608

20M→21M

20.0 - 21.0 mi

Top 53%
×8stories
+106ft-24ft

Overall

15169

Females

5273

F18-39

5273

21M→35K

21.0 - 21.8 mi

Top 58%
×7stories
+17ft-86ft

Overall

16357

Females

5977

F18-39

5977

35K→23M

21.8 - 23.0 mi

Top 47%
×5stories
+23ft-63ft

Overall

13301

Females

4439

F18-39

4439

23M→24M

23.0 - 24.0 mi

Top 52%
×6stories
+12ft-82ft

Overall

14646

Females

5182

F18-39

5182

24M→40K

24.0 - 24.9 mi

Top 53%
×1story
+6ft-20ft

Overall

15054

Females

5549

F18-39

5549

40K→25.2M

24.9 - 25.2 mi

Top 50%
×1story
+13ft-16ft

Overall

14240

Females

5160

F18-39

5160

25.2M→Finish

25.2 - 26.2 mi

Top 40%
×2stories
+22ft-21ft

Overall

11498

Females

3715

F18-39

3715

Passing Analysis

Category:
Athletes Passed
1611
Passed By
5027
Net Change
-3416
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12918
5K → 10K172316-2299#12918#15217
10K → 15K311181-1150#15217#16367
15K → 20K73594-521#16367#16888
20K → Half4923+26#16888#16862
Half → 25K107276-169#16862#17031
25K → 30K189319-130#17031#17161
30K → 20M90140-50#17161#17211
20M → 21M19137+154#17211#17057
21M → 35K8648+38#17057#17019
35K → 23M2579+248#17019#16771
23M → 24M13623+113#16771#16658
24M → 40K11537+78#16658#16580
40K → 25.2M5414+40#16580#16540
25.2M → Finish21610+206#16540#16334
TOTALS16115027-3416
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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