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BOSTON MARATHON 2025

Stacey Kern

WY

Bib: 14936 F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 44%
Masters (Masters Women)
#0 / 6759
Top 31%
Division (F45-49)
#0 / 1813
Top 38%
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
7:49/mi
24:18
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:49/mi
48:34
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:55/mi
1:13:09
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:06/mi
1:38:19
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:55/mi
1:43:43
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:24/mi
2:04:05
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:51/mi
2:31:35
↑ 181↓ 1480.2%
138 ft elev
20M
9:34/mi
2:44:35
↑ 64↓ 500.2%
148 ft elev
21M
9:26/mi
2:54:01
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:35/mi
3:00:26
↑ 17↓ 861.7%
156 ft elev
23M
8:57/mi
3:11:38
↑ 23↓ 630.6%
116 ft elev
24M
8:53/mi
3:20:31
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:53/mi
3:28:07
↓ 200.3%
20 ft elev
25.2M
9:31/mi
3:31:24
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:28/mi
3:40:02
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:43:43
Pace7:55 /mi
2nd Half
Distance13.11 mi
Time1:56:19
Pace8:52 /mi
📊Positive Split: 12.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:55:4724:187:4924:18
7:49
-
10K
6.21 mi11:20:0348:347:4924:16
7:49
0:00
15K
9.32 mi11:44:381:13:097:5124:35
7:55
+0:06
20K
12.43 mi12:09:481:38:197:5525:10
8:06
+0:11
Half
13.11 mi12:15:121:43:437:555:24
7:55
-0:11
25K
15.53 mi12:35:342:04:057:5920:22
8:24
+0:29
30K
18.64 mi13:03:042:31:358:0827:30
8:51
+0:27
20M
20.00 mi13:16:042:44:358:1413:00
9:34
+0:43
21M
21.00 mi13:25:302:54:018:179:26
9:26
-0:08
35K
21.75 mi13:31:553:00:268:186:25
8:35
-0:51
23M
23.00 mi13:43:073:11:388:2011:12
8:57
+0:22
24M
24.00 mi13:52:003:20:318:218:53
8:53
-0:04
40K
24.85 mi13:59:363:28:078:227:36
8:53
0:00
25.2M
25.20 mi14:02:533:31:248:233:17
9:31
+0:38
Finish
26.22 mi14:11:313:40:028:248:38
8:28
-1:03

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

7:49 /mi

Average Pace

8:24 /mi

Slowest Pace

9:34 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:43:43

47% of race

Time at Steady Pace

1:02:55

29% of race

Time at Slower Pace

53:24

24% of race

Average Pace: 8:24 /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 mi10:55:4724:187:4924:18
7:49
#15023
10K
6.21 mi11:20:0348:347:4924:16
7:49
#14919
15K
9.32 mi11:44:381:13:097:5124:35
7:55
#15066
20K
12.43 mi12:09:481:38:197:5525:10
8:06
#15208
Half
13.11 mi12:15:121:43:437:555:24
7:55
#15197
25K
15.53 mi12:35:342:04:057:5920:22
8:24
#15452
30K
18.64 mi13:03:042:31:358:0827:30
8:51
#15764
20M
20.00 mi13:16:042:44:358:1413:00
9:34
#16074
21M
21.00 mi13:25:302:54:018:179:26
9:26
#15989
35K
21.75 mi13:31:553:00:268:186:25
8:35
#15955
23M
23.00 mi13:43:073:11:388:2011:12
8:57
#15902
24M
24.00 mi13:52:003:20:318:218:53
8:53
#15932
40K
24.85 mi13:59:363:28:078:227:36
8:53
#15902
25.2M
25.20 mi14:02:533:31:248:233:17
9:31
#15866
Finish
26.22 mi14:11:313:40:028:248:38
8:28
#15881
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi150234544454415357(Top 54%)4787(Top 39%)4787(Top 264%)
10K6.21 mi3.10 mi14919+1044508+364508+3614943(Top 53%)4502(Top 37%)4502(Top 248%)
15K9.32 mi3.11 mi15066-1474595-874595-8715357(Top 54%)4787(Top 39%)4787(Top 264%)
20K12.43 mi3.11 mi15208-1424703-1084703-10815659(Top 55%)5014(Top 41%)5014(Top 277%)
Half13.11 mi0.68 mi15197+114696+74696+715300(Top 54%)4797(Top 39%)4797(Top 265%)
25K15.53 mi2.42 mi15452-2554861-1654861-16516585(Top 58%)5621(Top 46%)5621(Top 310%)
30K18.64 mi3.11 mi15764-3125092-2315092-23116906(Top 60%)5983(Top 49%)5983(Top 330%)
20M20.00 mi1.36 mi16074-3105309-2175309-21719476(Top 69%)7504(Top 61%)7504(Top 414%)
21M21.00 mi1.00 mi15989+855295+145295+1415797(Top 56%)5600(Top 46%)5600(Top 309%)
35K21.75 mi0.75 mi15955+345300-55300-515954(Top 56%)5745(Top 47%)5745(Top 317%)
23M23.00 mi1.25 mi15902+535315-155315-1515964(Top 56%)5864(Top 48%)5864(Top 323%)
24M24.00 mi1.00 mi15932-305339-245339-2416764(Top 59%)6354(Top 52%)6354(Top 350%)
40K24.85 mi0.85 mi15902+305347-85347-815717(Top 55%)5901(Top 48%)5901(Top 325%)
25.2M25.20 mi0.35 mi15866+365344+35344+314748(Top 52%)5418(Top 44%)5418(Top 299%)
Finish26.22 mi1.02 mi15881-155377-335377-3316047(Top 56%)6042(Top 49%)6042(Top 333%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 54%
×21story building
+97ft-345ft

Overall

15357

Females

4787

F45-49

4787

5K→10K

3.1 - 6.2 mi

Top 53%
×5story building
+79ft-138ft

Overall

14943

Females

4502

F45-49

4502

10K→15K

6.2 - 9.3 mi

Top 54%
×3story building
+67ft-78ft

Overall

15357

Females

4787

F45-49

4787

15K→20K

9.3 - 12.4 mi

Top 55%
×5story building
+106ft-86ft

Overall

15659

Females

5014

F45-49

5014

20K→Half

12.4 - 13.1 mi

Top 54%
×2story building
+19ft-37ft

Overall

15300

Females

4797

F45-49

4797

Half→25K

13.1 - 15.5 mi

Top 58%
×4story building
+66ft-88ft

Overall

16585

Females

5621

F45-49

5621

25K→30K

15.5 - 18.6 mi

Top 60%
×9story building
+181ft-148ft

Overall

16906

Females

5983

F45-49

5983

30K→20M

18.6 - 20.0 mi

Top 69%
×5story building
+64ft-50ft

Overall

19476

Females

7504

F45-49

7504

20M→21M

20.0 - 21.0 mi

Top 56%
×8story building
+106ft-24ft

Overall

15797

Females

5600

F45-49

5600

21M→35K

21.0 - 21.8 mi

Top 56%
×7story building
+17ft-86ft

Overall

15954

Females

5745

F45-49

5745

35K→23M

21.8 - 23.0 mi

Top 56%
×5story building
+23ft-63ft

Overall

15964

Females

5864

F45-49

5864

23M→24M

23.0 - 24.0 mi

Top 59%
×6story building
+12ft-82ft

Overall

16764

Females

6354

F45-49

6354

24M→40K

24.0 - 24.9 mi

Top 55%
×1story
+6ft-20ft

Overall

15717

Females

5901

F45-49

5901

40K→25.2M

24.9 - 25.2 mi

Top 52%
×1story
+13ft-16ft

Overall

14748

Females

5418

F45-49

5418

25.2M→Finish

25.2 - 26.2 mi

Top 56%
×2story building
+22ft-21ft

Overall

16047

Females

6042

F45-49

6042

Passing Analysis

Category:
Athletes Passed
1615
Passed By
2473
Net Change
-858
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15023
5K → 10K339235+104#15023#14919
10K → 15K158305-147#14919#15066
15K → 20K164306-142#15066#15208
20K → Half4534+11#15208#15197
Half → 25K99354-255#15197#15452
25K → 30K148460-312#15452#15764
30K → 20M48358-310#15764#16074
20M → 21M14762+85#16074#15989
21M → 35K8147+34#15989#15955
35K → 23M13683+53#15955#15902
23M → 24M5686-30#15902#15932
24M → 40K8050+30#15932#15902
40K → 25.2M5216+36#15902#15866
25.2M → Finish6277-15#15866#15881
TOTALS16152473-858
📊

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