Boston Marathon logo
BOSTON MARATHON 2023

Marcea Stilson

Bib: 16910•F

MA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 41%
Gender (Female)
#0 / 11423
Top 22%
Division (F18-39)
#0 / 4884
Top 38%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:47/mi
24:10
↑ 97↓ 3451.5%
10K· 6.21 mi
7:47/mi
48:22
↑ 79↓ 1380.4%
15K· 9.32 mi
7:51/mi
1:12:44
↑ 67↓ 78
20K· 12.43 mi
8:02/mi
1:37:43
↑ 106↓ 860.1%
Half· 13.11 mi
7:36/mi
1:42:54
↑ 19↓ 370.5%
25K· 15.53 mi
7:51/mi
2:01:57
↑ 66↓ 880.2%
30K· 18.64 mi
7:54/mi
2:26:29
↑ 181↓ 1480.2%
20M
7:58/mi
2:37:18
↑ 64↓ 500.2%
21M
8:06/mi
2:45:24
↑ 106↓ 241.6%
35K· 21.75 mi
7:40/mi
2:51:08
↑ 17↓ 861.7%
23M
7:53/mi
3:01:00
↑ 23↓ 630.6%
24M
7:46/mi
3:08:46
↓ 821.3%
40K· 24.85 mi
7:55/mi
3:15:32
↓ 200.3%
25.2M
7:56/mi
3:18:16
↑ 13↓ 160.2%
Finish· 26.22 mi
7:03/mi
3:25:27
↑ 22↓ 21

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 Half⚖️ Balanced
Distance13.11 mi
Time1:42:54
Pace7:51 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:42:33
Pace7:49 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:14:2624:107:4724:10
7:47
-
10K
6.21 mi11:38:3848:227:4724:12
7:47
0:00
15K
9.32 mi12:03:001:12:447:4824:22
7:51
+0:04
20K
12.43 mi12:27:591:37:437:5224:59
8:02
+0:11
Half
13.11 mi12:33:101:42:547:515:11
7:36
-0:26
25K
15.53 mi12:52:132:01:577:5119:03
7:51
+0:15
30K
18.64 mi13:16:452:26:297:5124:32
7:54
+0:03
20M
20.00 mi13:27:342:37:187:5210:49
7:58
+0:04
21M
21.00 mi13:35:402:45:247:538:06
8:06
+0:08
35K
21.75 mi13:41:242:51:087:525:44
7:40
-0:26
23M
23.00 mi13:51:163:01:007:529:52
7:53
+0:13
24M
24.00 mi13:59:023:08:467:527:46
7:46
-0:07
40K
24.85 mi14:05:483:15:327:526:46
7:55
+0:09
25.2M
25.20 mi14:08:323:18:167:522:44
7:56
+0:01
Finish
26.22 mi14:15:433:25:277:507:11
7:03
-0:53

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

7:03 /mi

Average Pace

7:50 /mi

Slowest Pace

8:06 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

18:06

9% of race

Time at Steady Pace

3:07:21

91% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:50 /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 mi11:14:2624:107:4724:10
7:47
#12169
10K
6.21 mi11:38:3848:227:4724:12
7:47
#12552
15K
9.32 mi12:03:001:12:447:4824:22
7:51
#12715
20K
12.43 mi12:27:591:37:437:5224:59
8:02
#12974
Half
13.11 mi12:33:101:42:547:515:11
7:36
#12853
25K
15.53 mi12:52:132:01:577:5119:03
7:51
#12593
30K
18.64 mi13:16:452:26:297:5124:32
7:54
#12105
20M
20.00 mi13:27:342:37:187:5210:49
7:58
#11920
21M
21.00 mi13:35:402:45:247:538:06
8:06
#11659
35K
21.75 mi13:41:242:51:087:525:44
7:40
#11573
23M
23.00 mi13:51:163:01:007:529:52
7:53
#11385
24M
24.00 mi13:59:023:08:467:527:46
7:46
#11287
40K
24.85 mi14:05:483:15:327:526:46
7:55
#11181
25.2M
25.20 mi14:08:323:18:167:522:44
7:56
#11068
Finish
26.22 mi14:15:433:25:277:507:11
7:03
#10804
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi121692959295913074(Top 49%)3518(Top 31%)3518(Top 72%)
10K6.21 mi3.10 mi12552-3833184-2253184-22513029(Top 49%)3440(Top 30%)3440(Top 70%)
15K9.32 mi3.11 mi12715-1633290-1063290-10613074(Top 49%)3518(Top 31%)3518(Top 72%)
20K12.43 mi3.11 mi12974-2593469-1793469-17913763(Top 52%)3967(Top 35%)3967(Top 81%)
Half13.11 mi0.68 mi12853+1213393+763393+7611059(Top 42%)2401(Top 21%)2401(Top 49%)
25K15.53 mi2.42 mi12593+2603277+1163277+11611583(Top 44%)2816(Top 25%)2816(Top 58%)
30K18.64 mi3.11 mi12105+4883034+2433034+24310129(Top 38%)2228(Top 20%)2228(Top 46%)
20M20.00 mi1.36 mi11920+1852948+862948+8610004(Top 38%)2235(Top 20%)2235(Top 46%)
21M21.00 mi1.00 mi11659+2612823+1252823+1258052(Top 30%)1550(Top 14%)1550(Top 32%)
35K21.75 mi0.75 mi11573+862788+352788+359744(Top 37%)2248(Top 20%)2248(Top 46%)
23M23.00 mi1.25 mi11385+1882712+762712+768980(Top 34%)2024(Top 18%)2024(Top 41%)
24M24.00 mi1.00 mi11287+982670+422670+429562(Top 36%)2372(Top 21%)2372(Top 49%)
40K24.85 mi0.85 mi11181+1062640+302640+309479(Top 36%)2394(Top 21%)2394(Top 49%)
25.2M25.20 mi0.35 mi11068+1132599+412599+416192(Top 23%)1142(Top 10%)1142(Top 23%)
Finish26.22 mi1.02 mi10804+2642498+1012498+1015562(Top 21%)941(Top 8%)941(Top 19%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 49%
×21story building
+97ft-345ft

Overall

13074

Females

3518

F18-39

3518

5K→10K

3.1 - 6.2 mi

Top 49%
×5story building
+79ft-138ft

Overall

13029

Females

3440

F18-39

3440

10K→15K

6.2 - 9.3 mi

Top 49%
×3story building
+67ft-78ft

Overall

13074

Females

3518

F18-39

3518

15K→20K

9.3 - 12.4 mi

Top 52%
×5story building
+106ft-86ft

Overall

13763

Females

3967

F18-39

3967

20K→Half

12.4 - 13.1 mi

Top 42%
×2story building
+19ft-37ft

Overall

11059

Females

2401

F18-39

2401

Half→25K

13.1 - 15.5 mi

Top 44%
×4story building
+66ft-88ft

Overall

11583

Females

2816

F18-39

2816

25K→30K

15.5 - 18.6 mi

Top 38%
×9story building
+181ft-148ft

Overall

10129

Females

2228

F18-39

2228

30K→20M

18.6 - 20.0 mi

Top 38%
×5story building
+64ft-50ft

Overall

10004

Females

2235

F18-39

2235

20M→21M

20.0 - 21.0 mi

Top 30%
×8story building
+106ft-24ft

Overall

8052

Females

1550

F18-39

1550

21M→35K

21.0 - 21.8 mi

Top 37%
×7story building
+17ft-86ft

Overall

9744

Females

2248

F18-39

2248

35K→23M

21.8 - 23.0 mi

Top 34%
×5story building
+23ft-63ft

Overall

8980

Females

2024

F18-39

2024

23M→24M

23.0 - 24.0 mi

Top 36%
×6story building
+12ft-82ft

Overall

9562

Females

2372

F18-39

2372

24M→40K

24.0 - 24.9 mi

Top 36%
×1story
+6ft-20ft

Overall

9479

Females

2394

F18-39

2394

40K→25.2M

24.9 - 25.2 mi

Top 23%
×1story
+13ft-16ft

Overall

6192

Females

1142

F18-39

1142

25.2M→Finish

25.2 - 26.2 mi

Top 21%
×2story building
+22ft-21ft

Overall

5562

Females

941

F18-39

941

Passing Analysis

Category:
Athletes Passed
2725
Passed By
1360
Net Change
+1365
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12169
5K → 10K163546-383#12169#12552
10K → 15K136299-163#12552#12715
15K → 20K112371-259#12715#12974
20K → Half1232+121#12974#12853
Half → 25K28626+260#12853#12593
25K → 30K50719+488#12593#12105
30K → 20M20318+185#12105#11920
20M → 21M2676+261#11920#11659
21M → 35K10216+86#11659#11573
35K → 23M20820+188#11573#11385
23M → 24M12123+98#11385#11287
24M → 40K11913+106#11287#11181
40K → 25.2M1141+113#11181#11068
25.2M → Finish2640+264#11068#10804
TOTALS27251360+1365
📊

Passing Visuals

Category:
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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing