Boston Marathon logo
BOSTON MARATHON 2024

Catharine Szefcyk

Bib: 17702•F

OH

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 25550
Gender (Female)
#0 / 10924
Division (F18-39)
#0 / 4660
Race Day Weather
55°/45°F
scattered clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:29
Rank: #13750
Start → 5K
24:29 | 7:53/mi
10K· 6.21 mi
48:53
Rank: #13374 (+376)
5K → 10K
24:24 | 7:51/mi
15K· 9.32 mi
1:14:25
Rank: #13959 (-585)
10K → 15K
25:32 | 8:13/mi
20K· 12.43 mi
1:43:51
Rank: #15602 (-1643)
15K → 20K
29:26 | 9:28/mi
Half· 13.11 mi
1:50:31
Rank: #15981 (-379)
20K → Half
6:40 | 9:46/mi
25K· 15.53 mi
2:16:25
Rank: #17270 (-1289)
Half → 25K
25:54 | 10:41/mi
30K· 18.64 mi
2:52:27
Rank: #18461 (-1191)
25K → 30K
36:02 | 11:36/mi
20M
3:07:28
Rank: #18582 (-121)
30K → 20M
15:01 | 11:03/mi
21M
3:19:39
Rank: #18605 (-23)
20M → 21M
12:11 | 12:11/mi
35K· 21.75 mi
3:27:38
Rank: #18618 (-13)
21M → 35K
7:59 | 10:40/mi
23M
3:41:21
Rank: #18580 (+38)
35K → 23M
13:43 | 10:57/mi
24M
3:51:52
Rank: #18529 (+51)
23M → 24M
10:31 | 10:31/mi
40K· 24.85 mi
4:01:55
Rank: #18590 (-61)
24M → 40K
10:03 | 11:45/mi
25.2M
4:06:17
Rank: #18575 (+15)
40K → 25.2M
4:22 | 12:40/mi
Finish· 26.22 mi
4:15:32
Rank: #18430 (+145)
25.2M → Finish
9:15 | 9:05/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:50:31
Pace8:26 /mi
2nd Half
Distance13.11 mi
Time2:25:01
Pace11:04 /mi
📊Positive Split: 31.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:3524:297:5324:29
7:53
-
10K
6.21 mi11:39:5948:537:5224:24
7:51
-0:02
15K
9.32 mi12:05:311:14:257:5925:32
8:13
+0:22
20K
12.43 mi12:34:571:43:518:2129:26
9:28
+1:15
Half
13.11 mi12:41:371:50:318:266:40
9:46
+0:18
25K
15.53 mi13:07:312:16:258:4725:54
10:41
+0:55
30K
18.64 mi13:43:332:52:279:1536:02
11:36
+0:55
20M
20.00 mi13:58:343:07:289:2215:01
11:03
-0:33
21M
21.00 mi14:10:453:19:399:3012:11
12:11
+1:08
35K
21.75 mi14:18:443:27:389:337:59
10:40
-1:31
23M
23.00 mi14:32:273:41:219:3713:43
10:57
+0:17
24M
24.00 mi14:42:583:51:529:4010:31
10:31
-0:26
40K
24.85 mi14:53:014:01:559:4410:03
11:45
+1:14
25.2M
25.20 mi14:57:234:06:179:464:22
12:40
+0:55
Finish
26.22 mi15:06:384:15:329:459:15
9:05
-3:35

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

7:51 /mi

Average Pace

9:45 /mi

Slowest Pace

12:40 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:59:46

47% of race

Time at Steady Pace

1:13:08

29% of race

Time at Slower Pace

1:02:38

25% of race

Average Pace: 9:45 /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 mi11:15:3524:297:5324:29
7:53
#13750
10K
6.21 mi11:39:5948:537:5224:24
7:51
#13374
15K
9.32 mi12:05:311:14:257:5925:32
8:13
#13959
20K
12.43 mi12:34:571:43:518:2129:26
9:28
#15602
Half
13.11 mi12:41:371:50:318:266:40
9:46
#15981
25K
15.53 mi13:07:312:16:258:4725:54
10:41
#17270
30K
18.64 mi13:43:332:52:279:1536:02
11:36
#18461
20M
20.00 mi13:58:343:07:289:2215:01
11:03
#18582
21M
21.00 mi14:10:453:19:399:3012:11
12:11
#18605
35K
21.75 mi14:18:443:27:389:337:59
10:40
#18618
23M
23.00 mi14:32:273:41:219:3713:43
10:57
#18580
24M
24.00 mi14:42:583:51:529:4010:31
10:31
#18529
40K
24.85 mi14:53:014:01:559:4410:03
11:45
#18590
25.2M
25.20 mi14:57:234:06:179:464:22
12:40
#18575
Finish
26.22 mi15:06:384:15:329:459:15
9:05
#18430
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi137504152415214837(Top 58%)4873(Top 45%)4873(Top 105%)
10K6.21 mi3.10 mi13374+3763950+2023950+20213115(Top 51%)3835(Top 35%)3835(Top 82%)
15K9.32 mi3.11 mi13959-5854318-3684318-36814837(Top 58%)4873(Top 45%)4873(Top 105%)
20K12.43 mi3.11 mi15602-16435327-10095327-100919112(Top 75%)7329(Top 67%)7329(Top 157%)
Half13.11 mi0.68 mi15981-3795574-2475574-24720876(Top 82%)8339(Top 76%)8339(Top 179%)
25K15.53 mi2.42 mi17270-12896351-7776351-77720840(Top 82%)8384(Top 77%)8384(Top 180%)
30K18.64 mi3.11 mi18461-11917083-7327083-73221210(Top 83%)8740(Top 80%)8740(Top 188%)
20M20.00 mi1.36 mi18582-1217172-897172-8919402(Top 76%)7913(Top 72%)7913(Top 170%)
21M21.00 mi1.00 mi18605-237208-367208-3619221(Top 75%)7920(Top 73%)7920(Top 170%)
35K21.75 mi0.75 mi18618-137236-287236-2819023(Top 74%)7846(Top 72%)7846(Top 168%)
23M23.00 mi1.25 mi18580+387242-67242-618306(Top 72%)7553(Top 69%)7553(Top 162%)
24M24.00 mi1.00 mi18529+517233+97233+917904(Top 70%)7421(Top 68%)7421(Top 159%)
40K24.85 mi0.85 mi18590-617286-537286-5319920(Top 78%)8465(Top 77%)8465(Top 182%)
25.2M25.20 mi0.35 mi18575+157291-57291-518937(Top 74%)7967(Top 73%)7967(Top 171%)
Finish26.22 mi1.02 mi18430+1457235+567235+5614624(Top 57%)5794(Top 53%)5794(Top 124%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 58%
×21stories
+97ft-345ft

Overall

14837

Females

4873

F18-39

4873

5K→10K

3.1 - 6.2 mi

Top 51%
×5stories
+79ft-138ft

Overall

13115

Females

3835

F18-39

3835

10K→15K

6.2 - 9.3 mi

Top 58%
×3stories
+67ft-78ft

Overall

14837

Females

4873

F18-39

4873

15K→20K

9.3 - 12.4 mi

Top 75%
×5stories
+106ft-86ft

Overall

19112

Females

7329

F18-39

7329

20K→Half

12.4 - 13.1 mi

Top 82%
×2stories
+19ft-37ft

Overall

20876

Females

8339

F18-39

8339

Half→25K

13.1 - 15.5 mi

Top 82%
×4stories
+66ft-88ft

Overall

20840

Females

8384

F18-39

8384

25K→30K

15.5 - 18.6 mi

Top 83%
×9stories
+181ft-148ft

Overall

21210

Females

8740

F18-39

8740

30K→20M

18.6 - 20.0 mi

Top 76%
×5stories
+64ft-50ft

Overall

19402

Females

7913

F18-39

7913

20M→21M

20.0 - 21.0 mi

Top 75%
×8stories
+106ft-24ft

Overall

19221

Females

7920

F18-39

7920

21M→35K

21.0 - 21.8 mi

Top 74%
×7stories
+17ft-86ft

Overall

19023

Females

7846

F18-39

7846

35K→23M

21.8 - 23.0 mi

Top 72%
×5stories
+23ft-63ft

Overall

18306

Females

7553

F18-39

7553

23M→24M

23.0 - 24.0 mi

Top 70%
×6stories
+12ft-82ft

Overall

17904

Females

7421

F18-39

7421

24M→40K

24.0 - 24.9 mi

Top 78%
×1story
+6ft-20ft

Overall

19920

Females

8465

F18-39

8465

40K→25.2M

24.9 - 25.2 mi

Top 74%
×1story
+13ft-16ft

Overall

18937

Females

7967

F18-39

7967

25.2M→Finish

25.2 - 26.2 mi

Top 57%
×2stories
+22ft-21ft

Overall

14624

Females

5794

F18-39

5794

Passing Analysis

Category:
Athletes Passed
1400
Passed By
6080
Net Change
-4680
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13750
5K → 10K530154+376#13750#13374
10K → 15K89674-585#13374#13959
15K → 20K261669-1643#13959#15602
20K → Half5384-379#15602#15981
Half → 25K361325-1289#15981#17270
25K → 30K511242-1191#17270#18461
30K → 20M60181-121#18461#18582
20M → 21M90113-23#18582#18605
21M → 35K5871-13#18605#18618
35K → 23M13496+38#18618#18580
23M → 24M9645+51#18580#18529
24M → 40K3899-61#18529#18590
40K → 25.2M3823+15#18590#18575
25.2M → Finish1494+145#18575#18430
TOTALS14006080-4680
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing