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BOSTON MARATHON 2025

Karen Mcelroy

ON

Bib: 21834 F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 46%
Masters (Masters Women)
#0 / 6759
Top 34%
Division (F45-49)
#0 / 1813
Top 42%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
8:09/mi
25:20
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
8:08/mi
50:36
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
8:17/mi
1:16:19
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:05/mi
1:41:26
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:59/mi
1:46:53
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:10/mi
2:06:42
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:47/mi
2:34:00
↑ 181↓ 1480.2%
138 ft elev
20M
8:34/mi
2:45:38
↑ 64↓ 500.2%
148 ft elev
21M
9:16/mi
2:54:54
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:25/mi
3:01:12
↑ 17↓ 861.7%
156 ft elev
23M
10:57/mi
3:14:55
↑ 23↓ 630.6%
116 ft elev
24M
8:19/mi
3:23:14
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:46/mi
3:30:44
↓ 200.3%
20 ft elev
25.2M
9:23/mi
3:33:58
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:08/mi
3:42:15
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:46:538:09 /mi⚡ faster
2nd Half
1:55:228:48 /mi+7.9%
Positive split — 7.9% slower in the second half
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Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:21:2525:208:0925:20
8:09
-
10K
6.21 mi11:46:4150:368:0925:16
8:08
-0:01
15K
9.32 mi12:12:241:16:198:1125:43
8:17
+0:09
20K
12.43 mi12:37:311:41:268:1025:07
8:05
-0:12
Half
13.11 mi12:42:581:46:538:095:27
7:59
-0:06
25K
15.53 mi13:02:472:06:428:0919:49
8:10
+0:11
30K
18.64 mi13:30:052:34:008:1627:18
8:47
+0:37
20M
20.00 mi13:41:432:45:388:1711:38
8:34
-0:13
21M
21.00 mi13:50:592:54:548:209:16
9:16
+0:42
35K
21.75 mi13:57:173:01:128:206:18
8:25
-0:51
23M
23.00 mi14:11:003:14:558:2813:43
10:57
+2:32
24M
24.00 mi14:19:193:23:148:288:19
8:19
-2:38
40K
24.85 mi14:26:493:30:448:297:30
8:46
+0:27
25.2M
25.20 mi14:30:033:33:588:293:14
9:23
+0:37
Finish
26.22 mi14:38:203:42:158:298:17
8:08
-1:15

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

7:59 /mi

Average Pace

8:29 /mi

Slowest Pace

10:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

2:41:14

73% of race

Time at Slower Pace

1:01:01

27% of race

Average Pace: 8:29 /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 mi11:21:2525:208:0925:20
8:09
#17786
10K
6.21 mi11:46:4150:368:0925:16
8:08
#17600
15K
9.32 mi12:12:241:16:198:1125:43
8:17
#17686
20K
12.43 mi12:37:311:41:268:1025:07
8:05
#17111
Half
13.11 mi12:42:581:46:538:095:27
7:59
#17037
25K
15.53 mi13:02:472:06:428:0919:49
8:10
#16685
30K
18.64 mi13:30:052:34:008:1627:18
8:47
#16600
20M
20.00 mi13:41:432:45:388:1711:38
8:34
#16372
21M
21.00 mi13:50:592:54:548:209:16
9:16
#16252
35K
21.75 mi13:57:173:01:128:206:18
8:25
#16186
23M
23.00 mi14:11:003:14:558:2813:43
10:57
#16848
24M
24.00 mi14:19:193:23:148:288:19
8:19
#16678
40K
24.85 mi14:26:493:30:448:297:30
8:46
#16599
25.2M
25.20 mi14:30:033:33:588:293:14
9:23
#16562
Finish
26.22 mi14:38:203:42:158:298:17
8:08
#16428
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi17786620762071790062536253
10K6.21 mi3.10 mi17600+1866097+1106097+1101744359655965
15K9.32 mi3.11 mi17686-866137-406137-401790062536253
20K12.43 mi3.11 mi17111+5755811+3265811+3261555449464946
Half13.11 mi0.68 mi17037+745769+425769+421588251175117
25K15.53 mi2.42 mi16685+3525578+1915578+1911514748194819
30K18.64 mi3.11 mi16600+855581-35581-31652857565756
20M20.00 mi1.36 mi16372+2285478+1035478+1031420246244624
21M21.00 mi1.00 mi16252+1205440+385440+381499651795179
35K21.75 mi0.75 mi16186+665427+135427+131503952565256
23M23.00 mi1.25 mi16848-6625843-4165843-4162312496739673
24M24.00 mi1.00 mi16678+1705762+815762+811341245334533
40K24.85 mi0.85 mi16599+795747+155747+151505755525552
25.2M25.20 mi0.35 mi16562+375736+115736+111397350165016
Finish26.22 mi1.02 mi16428+1345686+505686+501382848744874

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21story building
+97ft-345ft

Overall

17900

Females

6253

F45-49

6253

5K→10K

3.1 - 6.2 mi

Top 61%
×5story building
+79ft-138ft

Overall

17443

Females

5965

F45-49

5965

10K→15K

6.2 - 9.3 mi

Top 63%
×3story building
+67ft-78ft

Overall

17900

Females

6253

F45-49

6253

15K→20K

9.3 - 12.4 mi

Top 55%
×5story building
+106ft-86ft

Overall

15554

Females

4946

F45-49

4946

20K→Half

12.4 - 13.1 mi

Top 56%
×2story building
+19ft-37ft

Overall

15882

Females

5117

F45-49

5117

Half→25K

13.1 - 15.5 mi

Top 53%
×4story building
+66ft-88ft

Overall

15147

Females

4819

F45-49

4819

25K→30K

15.5 - 18.6 mi

Top 58%
×9story building
+181ft-148ft

Overall

16528

Females

5756

F45-49

5756

30K→20M

18.6 - 20.0 mi

Top 50%
×5story building
+64ft-50ft

Overall

14202

Females

4624

F45-49

4624

20M→21M

20.0 - 21.0 mi

Top 53%
×8story building
+106ft-24ft

Overall

14996

Females

5179

F45-49

5179

21M→35K

21.0 - 21.8 mi

Top 53%
×7story building
+17ft-86ft

Overall

15039

Females

5256

F45-49

5256

35K→23M

21.8 - 23.0 mi

Top 81%
×5story building
+23ft-63ft

Overall

23124

Females

9673

F45-49

9673

23M→24M

23.0 - 24.0 mi

Top 47%
×6story building
+12ft-82ft

Overall

13412

Females

4533

F45-49

4533

24M→40K

24.0 - 24.9 mi

Top 53%
×1story
+6ft-20ft

Overall

15057

Females

5552

F45-49

5552

40K→25.2M

24.9 - 25.2 mi

Top 49%
×1story
+13ft-16ft

Overall

13973

Females

5016

F45-49

5016

25.2M→Finish

25.2 - 26.2 mi

Top 49%
×2story building
+22ft-21ft

Overall

13828

Females

4874

F45-49

4874

Passing Analysis

Category:
Athletes Passed
2851
Passed By
1493
Net Change
+1358
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17786
5K → 10K385199+186#17786#17600
10K → 15K161247-86#17600#17686
15K → 20K5838+575#17686#17111
20K → Half773+74#17111#17037
Half → 25K36513+352#17037#16685
25K → 30K259174+85#16685#16600
30K → 20M24113+228#16600#16372
20M → 21M16848+120#16372#16252
21M → 35K9327+66#16252#16186
35K → 23M18680-662#16186#16848
23M → 24M18010+170#16848#16678
24M → 40K11031+79#16678#16599
40K → 25.2M5114+37#16599#16562
25.2M → Finish16026+134#16562#16428
TOTALS28511493+1358

Passing Charts

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