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BOSTON MARATHON 2025

Kelsey Karkos

Bib: 9057•F

CO

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 36%
Gender (Female)
#0 / 12228
Top 19%
Division (F18-39)
#0 / 5469
Top 33%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:07
Rank: #11716
Start → 5K
23:07 | 7:26/mi
10K· 6.21 mi
46:27
Rank: #11923 (-207)
5K → 10K
23:20 | 7:31/mi
15K· 9.32 mi
1:09:42
Rank: #11800 (+123)
10K → 15K
23:15 | 7:29/mi
20K· 12.43 mi
1:32:45
Rank: #11345 (+455)
15K → 20K
23:03 | 7:25/mi
Half· 13.11 mi
1:37:47
Rank: #11310 (+35)
20K → Half
5:02 | 7:23/mi
25K· 15.53 mi
1:55:55
Rank: #11005 (+305)
Half → 25K
18:08 | 7:29/mi
30K· 18.64 mi
2:19:55
Rank: #10643 (+362)
25K → 30K
24:00 | 7:43/mi
20M
2:30:30
Rank: #10464 (+179)
30K → 20M
10:35 | 7:47/mi
21M
2:38:39
Rank: #10287 (+177)
20M → 21M
8:09 | 8:09/mi
35K· 21.75 mi
2:44:24
Rank: #10264 (+23)
21M → 35K
5:45 | 7:41/mi
23M
2:54:18
Rank: #10181 (+83)
35K → 23M
9:54 | 7:54/mi
24M
3:02:39
Rank: #10315 (-134)
23M → 24M
8:21 | 8:21/mi
40K· 24.85 mi
3:09:26
Rank: #10255 (+60)
24M → 40K
6:47 | 7:56/mi
25.2M
3:12:22
Rank: #10207 (+48)
40K → 25.2M
2:56 | 8:30/mi
Finish· 26.22 mi
3:19:59
Rank: #10139 (+68)
25.2M → Finish
7:37 | 7:28/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:37:47
Pace7:28 /mi
2nd Half
Distance13.11 mi
Time1:42:12
Pace7:48 /mi
📊Positive Split: 4.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:55:1223:077:2623:07
7:26
-
10K
6.21 mi11:18:3246:277:2923:20
7:31
+0:05
15K
9.32 mi11:41:471:09:427:2923:15
7:29
-0:02
20K
12.43 mi12:04:501:32:457:2823:03
7:25
-0:04
Half
13.11 mi12:09:521:37:477:285:02
7:23
-0:02
25K
15.53 mi12:28:001:55:557:2818:08
7:29
+0:06
30K
18.64 mi12:52:002:19:557:3024:00
7:43
+0:14
20M
20.00 mi13:02:352:30:307:3110:35
7:47
+0:04
21M
21.00 mi13:10:442:38:397:338:09
8:09
+0:22
35K
21.75 mi13:16:292:44:247:345:45
7:41
-0:28
23M
23.00 mi13:26:232:54:187:359:54
7:54
+0:13
24M
24.00 mi13:34:443:02:397:378:21
8:21
+0:27
40K
24.85 mi13:41:313:09:267:376:47
7:56
-0:25
25.2M
25.20 mi13:44:273:12:227:382:56
8:30
+0:34
Finish
26.22 mi13:52:043:19:597:387:37
7:28
-1:02

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

7:23 /mi

Average Pace

7:38 /mi

Slowest Pace

8:30 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:00:33

90% of race

Time at Steady Pace

19:26

10% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:38 /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 mi10:55:1223:077:2623:07
7:26
#11716
10K
6.21 mi11:18:3246:277:2923:20
7:31
#11923
15K
9.32 mi11:41:471:09:427:2923:15
7:29
#11800
20K
12.43 mi12:04:501:32:457:2823:03
7:25
#11345
Half
13.11 mi12:09:521:37:477:285:02
7:23
#11310
25K
15.53 mi12:28:001:55:557:2818:08
7:29
#11005
30K
18.64 mi12:52:002:19:557:3024:00
7:43
#10643
20M
20.00 mi13:02:352:30:307:3110:35
7:47
#10464
21M
21.00 mi13:10:442:38:397:338:09
8:09
#10287
35K
21.75 mi13:16:292:44:247:345:45
7:41
#10264
23M
23.00 mi13:26:232:54:187:359:54
7:54
#10181
24M
24.00 mi13:34:443:02:397:378:21
8:21
#10315
40K
24.85 mi13:41:313:09:267:376:47
7:56
#10255
25.2M
25.20 mi13:44:273:12:227:382:56
8:30
#10207
Finish
26.22 mi13:52:043:19:597:387:37
7:28
#10139
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi117162637263711629(Top 41%)2698(Top 22%)2698(Top 49%)
10K6.21 mi3.10 mi11923-2072768-1312768-13112202(Top 43%)2927(Top 24%)2927(Top 54%)
15K9.32 mi3.11 mi11800+1232713+552713+5511629(Top 41%)2698(Top 22%)2698(Top 49%)
20K12.43 mi3.11 mi11345+4552523+1902523+19010078(Top 35%)1997(Top 16%)1997(Top 37%)
Half13.11 mi0.68 mi11310+352507+162507+1610742(Top 38%)2307(Top 19%)2307(Top 42%)
25K15.53 mi2.42 mi11005+3052388+1192388+1199819(Top 35%)2029(Top 17%)2029(Top 37%)
30K18.64 mi3.11 mi10643+3622278+1102278+1109379(Top 33%)1998(Top 16%)1998(Top 37%)
20M20.00 mi1.36 mi10464+1792230+482230+488972(Top 32%)1979(Top 16%)1979(Top 36%)
21M21.00 mi1.00 mi10287+1772182+482182+488297(Top 29%)1856(Top 15%)1856(Top 34%)
35K21.75 mi0.75 mi10264+232194-122194-1210012(Top 35%)2598(Top 21%)2598(Top 48%)
23M23.00 mi1.25 mi10181+832198-42198-49364(Top 33%)2431(Top 20%)2431(Top 44%)
24M24.00 mi1.00 mi10315-1342294-962294-9613572(Top 48%)4595(Top 38%)4595(Top 84%)
40K24.85 mi0.85 mi10255+602304-102304-109721(Top 34%)2780(Top 23%)2780(Top 51%)
25.2M25.20 mi0.35 mi10207+482295+92295+98883(Top 31%)2467(Top 20%)2467(Top 45%)
Finish26.22 mi1.02 mi10139+682292+32292+39035(Top 32%)2553(Top 21%)2553(Top 47%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 41%
×21stories
+97ft-345ft

Overall

11629

Females

2698

F18-39

2698

5K→10K

3.1 - 6.2 mi

Top 43%
×5stories
+79ft-138ft

Overall

12202

Females

2927

F18-39

2927

10K→15K

6.2 - 9.3 mi

Top 41%
×3stories
+67ft-78ft

Overall

11629

Females

2698

F18-39

2698

15K→20K

9.3 - 12.4 mi

Top 35%
×5stories
+106ft-86ft

Overall

10078

Females

1997

F18-39

1997

20K→Half

12.4 - 13.1 mi

Top 38%
×2stories
+19ft-37ft

Overall

10742

Females

2307

F18-39

2307

Half→25K

13.1 - 15.5 mi

Top 35%
×4stories
+66ft-88ft

Overall

9819

Females

2029

F18-39

2029

25K→30K

15.5 - 18.6 mi

Top 33%
×9stories
+181ft-148ft

Overall

9379

Females

1998

F18-39

1998

30K→20M

18.6 - 20.0 mi

Top 32%
×5stories
+64ft-50ft

Overall

8972

Females

1979

F18-39

1979

20M→21M

20.0 - 21.0 mi

Top 29%
×8stories
+106ft-24ft

Overall

8297

Females

1856

F18-39

1856

21M→35K

21.0 - 21.8 mi

Top 35%
×7stories
+17ft-86ft

Overall

10012

Females

2598

F18-39

2598

35K→23M

21.8 - 23.0 mi

Top 33%
×5stories
+23ft-63ft

Overall

9364

Females

2431

F18-39

2431

23M→24M

23.0 - 24.0 mi

Top 48%
×6stories
+12ft-82ft

Overall

13572

Females

4595

F18-39

4595

24M→40K

24.0 - 24.9 mi

Top 34%
×1story
+6ft-20ft

Overall

9721

Females

2780

F18-39

2780

40K→25.2M

24.9 - 25.2 mi

Top 31%
×1story
+13ft-16ft

Overall

8883

Females

2467

F18-39

2467

25.2M→Finish

25.2 - 26.2 mi

Top 32%
×2stories
+22ft-21ft

Overall

9035

Females

2553

F18-39

2553

Passing Analysis

Category:
Athletes Passed
2635
Passed By
1058
Net Change
+1577
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11716
5K → 10K163370-207#11716#11923
10K → 15K233110+123#11923#11800
15K → 20K47722+455#11800#11345
20K → Half4914+35#11345#11310
Half → 25K33429+305#11310#11005
25K → 30K43068+362#11005#10643
30K → 20M20425+179#10643#10464
20M → 21M20225+177#10464#10287
21M → 35K7047+23#10287#10264
35K → 23M13956+83#10264#10181
23M → 24M51185-134#10181#10315
24M → 40K10545+60#10315#10255
40K → 25.2M6618+48#10255#10207
25.2M → Finish11244+68#10207#10139
TOTALS26351058+1577
📊

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