Boston Marathon logo
BOSTON MARATHON 2024

Shelby Piekarczyk

Bib: 29544•F

CT

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
28:19
Rank: #20522
Start → 5K
28:19 | 9:07/mi
10K· 6.21 mi
56:23
Rank: #20177 (+345)
5K → 10K
28:04 | 9:02/mi
15K· 9.32 mi
1:24:25
Rank: #19792 (+385)
10K → 15K
28:02 | 9:01/mi
20K· 12.43 mi
1:52:46
Rank: #19277 (+515)
15K → 20K
28:21 | 9:07/mi
Half· 13.11 mi
1:59:00
Rank: #19254 (+23)
20K → Half
6:14 | 9:08/mi
25K· 15.53 mi
2:21:22
Rank: #18739 (+515)
Half → 25K
22:22 | 9:13/mi
30K· 18.64 mi
2:52:07
Rank: #18397 (+342)
25K → 30K
30:45 | 9:54/mi
20M
3:05:19
Rank: #18175 (+222)
30K → 20M
13:12 | 9:43/mi
21M
3:16:15
Rank: #18036 (+139)
20M → 21M
10:56 | 10:56/mi
35K· 21.75 mi
3:22:57
Rank: #17852 (+184)
21M → 35K
6:42 | 8:57/mi
23M
3:35:56
Rank: #17741 (+111)
35K → 23M
12:59 | 10:22/mi
24M
3:45:17
Rank: #17599 (+142)
23M → 24M
9:21 | 9:21/mi
40K· 24.85 mi
3:53:47
Rank: #17474 (+125)
24M → 40K
8:30 | 9:56/mi
25.2M
3:57:45
Rank: #17432 (+42)
40K → 25.2M
3:58 | 11:30/mi
Finish· 26.22 mi
4:07:06
Rank: #17301 (+131)
25.2M → Finish
9:21 | 9:11/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
Time1:59:00
Pace9:05 /mi
2nd Half
Distance13.11 mi
Time2:08:06
Pace9:46 /mi
📊Positive Split: 7.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:50:0128:199:0728:19
9:07
-
10K
6.21 mi12:18:0556:239:0428:04
9:02
-0:05
15K
9.32 mi12:46:071:24:259:0328:02
9:01
-0:01
20K
12.43 mi13:14:281:52:469:0428:21
9:07
+0:06
Half
13.11 mi13:20:421:59:009:056:14
9:08
+0:01
25K
15.53 mi13:43:042:21:229:0622:22
9:13
+0:05
30K
18.64 mi14:13:492:52:079:1430:45
9:54
+0:41
20M
20.00 mi14:27:013:05:199:1613:12
9:43
-0:11
21M
21.00 mi14:37:573:16:159:2110:56
10:56
+1:13
35K
21.75 mi14:44:393:22:579:206:42
8:57
-1:59
23M
23.00 mi14:57:383:35:569:2312:59
10:22
+1:25
24M
24.00 mi15:06:593:45:179:239:21
9:21
-1:01
40K
24.85 mi15:15:293:53:479:248:30
9:56
+0:35
25.2M
25.20 mi15:19:273:57:459:263:58
11:30
+1:34
Finish
26.22 mi15:28:484:07:069:269:21
9:11
-2:19

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

8:57 /mi

Average Pace

9:26 /mi

Slowest Pace

11:30 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

2:46:46

67% of race

Time at Slower Pace

1:20:20

33% of race

Average Pace: 9:25 /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 mi11:50:0128:199:0728:19
9:07
#20522
10K
6.21 mi12:18:0556:239:0428:04
9:02
#20177
15K
9.32 mi12:46:071:24:259:0328:02
9:01
#19792
20K
12.43 mi13:14:281:52:469:0428:21
9:07
#19277
Half
13.11 mi13:20:421:59:009:056:14
9:08
#19254
25K
15.53 mi13:43:042:21:229:0622:22
9:13
#18739
30K
18.64 mi14:13:492:52:079:1430:45
9:54
#18397
20M
20.00 mi14:27:013:05:199:1613:12
9:43
#18175
21M
21.00 mi14:37:573:16:159:2110:56
10:56
#18036
35K
21.75 mi14:44:393:22:579:206:42
8:57
#17852
23M
23.00 mi14:57:383:35:569:2312:59
10:22
#17741
24M
24.00 mi15:06:593:45:179:239:21
9:21
#17599
40K
24.85 mi15:15:293:53:479:248:30
9:56
#17474
25.2M
25.20 mi15:19:273:57:459:263:58
11:30
#17432
Finish
26.22 mi15:28:484:07:069:269:21
9:11
#17301
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi205228151815119016(Top 74%)7256(Top 66%)7256(Top 156%)
10K6.21 mi3.10 mi20177+3457952+1997952+19919874(Top 78%)7766(Top 71%)7766(Top 167%)
15K9.32 mi3.11 mi19792+3857731+2217731+22119016(Top 74%)7256(Top 66%)7256(Top 156%)
20K12.43 mi3.11 mi19277+5157450+2817450+28117885(Top 70%)6644(Top 61%)6644(Top 143%)
Half13.11 mi0.68 mi19254+237442+87442+818850(Top 74%)7240(Top 66%)7240(Top 155%)
25K15.53 mi2.42 mi18739+5157167+2757167+27516530(Top 65%)6009(Top 55%)6009(Top 129%)
30K18.64 mi3.11 mi18397+3427049+1187049+11817012(Top 67%)6518(Top 60%)6518(Top 140%)
20M20.00 mi1.36 mi18175+2226959+906959+9015422(Top 60%)5918(Top 54%)5918(Top 127%)
21M21.00 mi1.00 mi18036+1396903+566903+5616177(Top 63%)6412(Top 59%)6412(Top 138%)
35K21.75 mi0.75 mi17852+1846831+726831+7213144(Top 51%)4897(Top 45%)4897(Top 105%)
23M23.00 mi1.25 mi17741+1116789+426789+4216651(Top 65%)6729(Top 62%)6729(Top 144%)
24M24.00 mi1.00 mi17599+1426732+576732+5713809(Top 54%)5353(Top 49%)5353(Top 115%)
40K24.85 mi0.85 mi17474+1256696+366696+3614819(Top 58%)5938(Top 54%)5938(Top 127%)
25.2M25.20 mi0.35 mi17432+426689+76689+716088(Top 63%)6587(Top 60%)6587(Top 141%)
Finish26.22 mi1.02 mi17301+1316645+446645+4415058(Top 59%)6010(Top 55%)6010(Top 129%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 74%
×21stories
+97ft-345ft

Overall

19016

Females

7256

F18-39

7256

5K→10K

3.1 - 6.2 mi

Top 78%
×5stories
+79ft-138ft

Overall

19874

Females

7766

F18-39

7766

10K→15K

6.2 - 9.3 mi

Top 74%
×3stories
+67ft-78ft

Overall

19016

Females

7256

F18-39

7256

15K→20K

9.3 - 12.4 mi

Top 70%
×5stories
+106ft-86ft

Overall

17885

Females

6644

F18-39

6644

20K→Half

12.4 - 13.1 mi

Top 74%
×2stories
+19ft-37ft

Overall

18850

Females

7240

F18-39

7240

Half→25K

13.1 - 15.5 mi

Top 65%
×4stories
+66ft-88ft

Overall

16530

Females

6009

F18-39

6009

25K→30K

15.5 - 18.6 mi

Top 67%
×9stories
+181ft-148ft

Overall

17012

Females

6518

F18-39

6518

30K→20M

18.6 - 20.0 mi

Top 60%
×5stories
+64ft-50ft

Overall

15422

Females

5918

F18-39

5918

20M→21M

20.0 - 21.0 mi

Top 63%
×8stories
+106ft-24ft

Overall

16177

Females

6412

F18-39

6412

21M→35K

21.0 - 21.8 mi

Top 51%
×7stories
+17ft-86ft

Overall

13144

Females

4897

F18-39

4897

35K→23M

21.8 - 23.0 mi

Top 65%
×5stories
+23ft-63ft

Overall

16651

Females

6729

F18-39

6729

23M→24M

23.0 - 24.0 mi

Top 54%
×6stories
+12ft-82ft

Overall

13809

Females

5353

F18-39

5353

24M→40K

24.0 - 24.9 mi

Top 58%
×1story
+6ft-20ft

Overall

14819

Females

5938

F18-39

5938

40K→25.2M

24.9 - 25.2 mi

Top 63%
×1story
+13ft-16ft

Overall

16088

Females

6587

F18-39

6587

25.2M→Finish

25.2 - 26.2 mi

Top 59%
×2stories
+22ft-21ft

Overall

15058

Females

6010

F18-39

6010

Passing Analysis

Category:
Athletes Passed
3677
Passed By
456
Net Change
+3221
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20522
5K → 10K478133+345#20522#20177
10K → 15K43045+385#20177#19792
15K → 20K54328+515#19792#19277
20K → Half4825+23#19277#19254
Half → 25K52914+515#19254#18739
25K → 30K41977+342#18739#18397
30K → 20M2319+222#18397#18175
20M → 21M17334+139#18175#18036
21M → 35K1906+184#18036#17852
35K → 23M15645+111#17852#17741
23M → 24M1486+142#17741#17599
24M → 40K1338+125#17599#17474
40K → 25.2M5614+42#17474#17432
25.2M → Finish14312+131#17432#17301
TOTALS3677456+3221
📊

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