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BOSTON MARATHON 2025

Karin Nelson

Bib: 21247•F

GA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Top 46%
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
8:36/mi
26:42
↑ 97↓ 3451.5%
10K· 6.21 mi
9:08/mi
55:05
↑ 79↓ 1380.4%
15K· 9.32 mi
9:18/mi
1:23:59
↑ 67↓ 78
20K· 12.43 mi
9:31/mi
1:53:32
↑ 106↓ 860.1%
Half· 13.11 mi
9:32/mi
2:00:02
↑ 19↓ 370.5%
25K· 15.53 mi
8:31/mi
2:20:40
↑ 66↓ 880.2%
30K· 18.64 mi
8:31/mi
2:47:07
↑ 181↓ 1480.2%
20M
8:28/mi
2:58:38
↑ 64↓ 500.2%
21M
8:34/mi
3:07:12
↑ 106↓ 241.6%
35K· 21.75 mi
8:13/mi
3:13:21
↑ 17↓ 861.7%
23M
8:14/mi
3:23:40
↑ 23↓ 630.6%
24M
8:07/mi
3:31:47
↓ 821.3%
40K· 24.85 mi
8:09/mi
3:38:45
↓ 200.3%
25.2M
8:59/mi
3:41:51
↑ 13↓ 160.2%
Finish· 26.22 mi
7:53/mi
3:49:53
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time2:00:02
Pace9:09 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:49:51
Pace8:23 /mi
📊Negative Split: 8.5% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:43:1426:428:3626:42
8:36
-
10K
6.21 mi12:11:3755:058:5228:23
9:08
+0:32
15K
9.32 mi12:40:311:23:599:0128:54
9:18
+0:10
20K
12.43 mi13:10:041:53:329:0829:33
9:31
+0:13
Half
13.11 mi13:16:342:00:029:096:30
9:32
+0:01
25K
15.53 mi13:37:122:20:409:0320:38
8:31
-1:01
30K
18.64 mi14:03:392:47:078:5826:27
8:31
0:00
20M
20.00 mi14:15:102:58:388:5611:31
8:28
-0:03
21M
21.00 mi14:23:443:07:128:558:34
8:34
+0:06
35K
21.75 mi14:29:533:13:218:536:09
8:13
-0:21
23M
23.00 mi14:40:123:23:408:5110:19
8:14
+0:01
24M
24.00 mi14:48:193:31:478:498:07
8:07
-0:07
40K
24.85 mi14:55:173:38:458:486:58
8:09
+0:02
25.2M
25.20 mi14:58:233:41:518:483:06
8:59
+0:50
Finish
26.22 mi15:06:253:49:538:468:02
7:53
-1:06

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

7:53 /mi

Average Pace

8:46 /mi

Slowest Pace

9:32 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

39:35

17% of race

Time at Steady Pace

1:33:52

41% of race

Time at Slower Pace

1:36:26

42% of race

Average Pace: 8:46 /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 mi11:43:1426:428:3626:42
8:36
#20425
10K
6.21 mi12:11:3755:058:5228:23
9:08
#21781
15K
9.32 mi12:40:311:23:599:0128:54
9:18
#22327
20K
12.43 mi13:10:041:53:329:0829:33
9:31
#22505
Half
13.11 mi13:16:342:00:029:096:30
9:32
#22598
25K
15.53 mi13:37:122:20:409:0320:38
8:31
#21815
30K
18.64 mi14:03:392:47:078:5826:27
8:31
#20704
20M
20.00 mi14:15:102:58:388:5611:31
8:28
#20223
21M
21.00 mi14:23:443:07:128:558:34
8:34
#19769
35K
21.75 mi14:29:533:13:218:536:09
8:13
#19588
23M
23.00 mi14:40:123:23:408:5110:19
8:14
#19174
24M
24.00 mi14:48:193:31:478:498:07
8:07
#18907
40K
24.85 mi14:55:173:38:458:486:58
8:09
#18624
25.2M
25.20 mi14:58:233:41:518:483:06
8:59
#18504
Finish
26.22 mi15:06:253:49:538:468:02
7:53
#18300
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi204257757775723218(Top 82%)9214(Top 75%)9214(Top 508%)
10K6.21 mi3.10 mi21781-13568487-7308487-73022946(Top 81%)9099(Top 74%)9099(Top 502%)
15K9.32 mi3.11 mi22327-5468768-2818768-28123218(Top 82%)9214(Top 75%)9214(Top 508%)
20K12.43 mi3.11 mi22505-1788867-998867-9922946(Top 81%)9117(Top 75%)9117(Top 503%)
Half13.11 mi0.68 mi22598-938906-398906-3923642(Top 83%)9503(Top 78%)9503(Top 524%)
25K15.53 mi2.42 mi21815+7838507+3998507+39917279(Top 61%)6019(Top 49%)6019(Top 332%)
30K18.64 mi3.11 mi20704+11117928+5797928+57914856(Top 52%)4828(Top 39%)4828(Top 266%)
20M20.00 mi1.36 mi20223+4817680+2487680+24813673(Top 48%)4346(Top 36%)4346(Top 240%)
21M21.00 mi1.00 mi19769+4547441+2397441+23910947(Top 39%)3084(Top 25%)3084(Top 170%)
35K21.75 mi0.75 mi19588+1817359+827359+8213830(Top 49%)4610(Top 38%)4610(Top 254%)
23M23.00 mi1.25 mi19174+4147143+2167143+21611692(Top 41%)3590(Top 29%)3590(Top 198%)
24M24.00 mi1.00 mi18907+2677022+1217022+12112082(Top 43%)3861(Top 32%)3861(Top 213%)
40K24.85 mi0.85 mi18624+2836891+1316891+13111286(Top 40%)3570(Top 29%)3570(Top 197%)
25.2M25.20 mi0.35 mi18504+1206834+576834+5711870(Top 42%)3946(Top 32%)3946(Top 218%)
Finish26.22 mi1.02 mi18300+2046745+896745+8912108(Top 43%)3996(Top 33%)3996(Top 220%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 82%
×21story building
+97ft-345ft

Overall

23218

Females

9214

F45-49

9214

5K→10K

3.1 - 6.2 mi

Top 81%
×5story building
+79ft-138ft

Overall

22946

Females

9099

F45-49

9099

10K→15K

6.2 - 9.3 mi

Top 82%
×3story building
+67ft-78ft

Overall

23218

Females

9214

F45-49

9214

15K→20K

9.3 - 12.4 mi

Top 81%
×5story building
+106ft-86ft

Overall

22946

Females

9117

F45-49

9117

20K→Half

12.4 - 13.1 mi

Top 83%
×2story building
+19ft-37ft

Overall

23642

Females

9503

F45-49

9503

Half→25K

13.1 - 15.5 mi

Top 61%
×4story building
+66ft-88ft

Overall

17279

Females

6019

F45-49

6019

25K→30K

15.5 - 18.6 mi

Top 52%
×9story building
+181ft-148ft

Overall

14856

Females

4828

F45-49

4828

30K→20M

18.6 - 20.0 mi

Top 48%
×5story building
+64ft-50ft

Overall

13673

Females

4346

F45-49

4346

20M→21M

20.0 - 21.0 mi

Top 39%
×8story building
+106ft-24ft

Overall

10947

Females

3084

F45-49

3084

21M→35K

21.0 - 21.8 mi

Top 49%
×7story building
+17ft-86ft

Overall

13830

Females

4610

F45-49

4610

35K→23M

21.8 - 23.0 mi

Top 41%
×5story building
+23ft-63ft

Overall

11692

Females

3590

F45-49

3590

23M→24M

23.0 - 24.0 mi

Top 43%
×6story building
+12ft-82ft

Overall

12082

Females

3861

F45-49

3861

24M→40K

24.0 - 24.9 mi

Top 40%
×1story
+6ft-20ft

Overall

11286

Females

3570

F45-49

3570

40K→25.2M

24.9 - 25.2 mi

Top 42%
×1story
+13ft-16ft

Overall

11870

Females

3946

F45-49

3946

25.2M→Finish

25.2 - 26.2 mi

Top 43%
×2story building
+22ft-21ft

Overall

12108

Females

3996

F45-49

3996

Passing Analysis

Category:
Athletes Passed
4544
Passed By
2419
Net Change
+2125
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20425
5K → 10K261382-1356#20425#21781
10K → 15K79625-546#21781#22327
15K → 20K116294-178#22327#22505
20K → Half12105-93#22505#22598
Half → 25K7830+783#22598#21815
25K → 30K11121+1111#21815#20704
30K → 20M4810+481#20704#20223
20M → 21M4540+454#20223#19769
21M → 35K1821+181#19769#19588
35K → 23M4140+414#19588#19174
23M → 24M2692+267#19174#18907
24M → 40K2841+283#18907#18624
40K → 25.2M1211+120#18624#18504
25.2M → Finish2117+204#18504#18300
TOTALS45442419+2125
📊

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