Boston Marathon logo
BOSTON MARATHON 2023

Daniel Simonds

Bib: 4921•M

CA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 13%
Gender (Male)
#0 / 15176
Top 21%
Division (M18-39)
#0 / 5285
Top 45%
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
6:30/mi
20:12
↑ 97↓ 3451.5%
10K· 6.21 mi
6:34/mi
40:37
↑ 79↓ 1380.4%
15K· 9.32 mi
6:41/mi
1:01:24
↑ 67↓ 78
20K· 12.43 mi
6:40/mi
1:22:08
↑ 106↓ 860.1%
Half· 13.11 mi
6:28/mi
1:26:33
↑ 19↓ 370.5%
25K· 15.53 mi
6:45/mi
1:42:56
↑ 66↓ 880.2%
30K· 18.64 mi
6:53/mi
2:04:18
↑ 181↓ 1480.2%
20M
6:59/mi
2:13:48
↑ 64↓ 500.2%
21M
7:24/mi
2:21:12
↑ 106↓ 241.6%
35K· 21.75 mi
6:50/mi
2:26:19
↑ 17↓ 861.7%
23M
7:03/mi
2:35:09
↑ 23↓ 630.6%
24M
6:51/mi
2:42:00
↓ 821.3%
40K· 24.85 mi
7:03/mi
2:48:02
↓ 200.3%
25.2M
7:44/mi
2:50:42
↑ 13↓ 160.2%
Finish· 26.22 mi
7:00/mi
2:57:50
↑ 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 HalfFaster
Distance13.11 mi
Time1:26:33
Pace6:36 /mi
2nd Half
Distance13.11 mi
Time1:31:17
Pace6:58 /mi
📊Positive Split: 5.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:1820:126:3020:12
6:30
-
10K
6.21 mi10:42:4340:376:3220:25
6:34
+0:04
15K
9.32 mi11:03:301:01:246:3520:47
6:41
+0:07
20K
12.43 mi11:24:141:22:086:3720:44
6:40
-0:01
Half
13.11 mi11:28:391:26:336:364:25
6:28
-0:12
25K
15.53 mi11:45:021:42:566:3816:23
6:45
+0:17
30K
18.64 mi12:06:242:04:186:4021:22
6:53
+0:08
20M
20.00 mi12:15:542:13:486:419:30
6:59
+0:06
21M
21.00 mi12:23:182:21:126:437:24
7:24
+0:25
35K
21.75 mi12:28:252:26:196:445:07
6:50
-0:34
23M
23.00 mi12:37:152:35:096:458:50
7:03
+0:13
24M
24.00 mi12:44:062:42:006:456:51
6:51
-0:12
40K
24.85 mi12:50:082:48:026:466:02
7:03
+0:12
25.2M
25.20 mi12:52:482:50:426:462:40
7:44
+0:41
Finish
26.22 mi12:59:562:57:506:477:08
7:00
-0:44

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

6:28 /mi

Average Pace

6:47 /mi

Slowest Pace

7:44 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:47:46

94% of race

Time at Steady Pace

7:24

4% of race

Time at Slower Pace

2:40

1% of race

Average Pace: 6:47 /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 mi10:22:1820:126:3020:12
6:30
#2288
10K
6.21 mi10:42:4340:376:3220:25
6:34
#2713
15K
9.32 mi11:03:301:01:246:3520:47
6:41
#3106
20K
12.43 mi11:24:141:22:086:3720:44
6:40
#3140
Half
13.11 mi11:28:391:26:336:364:25
6:28
#3102
25K
15.53 mi11:45:021:42:566:3816:23
6:45
#3180
30K
18.64 mi12:06:242:04:186:4021:22
6:53
#3180
20M
20.00 mi12:15:542:13:486:419:30
6:59
#3211
21M
21.00 mi12:23:182:21:126:437:24
7:24
#3258
35K
21.75 mi12:28:252:26:196:445:07
6:50
#3281
23M
23.00 mi12:37:152:35:096:458:50
7:03
#3307
24M
24.00 mi12:44:062:42:006:456:51
6:51
#3327
40K
24.85 mi12:50:082:48:026:466:02
7:03
#3346
25.2M
25.20 mi12:52:482:50:426:462:40
7:44
#3373
Finish
26.22 mi12:59:562:57:506:477:08
7:00
#3439
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi2288218221824024(Top 15%)3780(Top 25%)3780(Top 72%)
10K6.21 mi3.10 mi2713-4252589-4072589-4073289(Top 12%)3131(Top 21%)3131(Top 59%)
15K9.32 mi3.11 mi3106-3932959-3702959-3704024(Top 15%)3780(Top 25%)3780(Top 72%)
20K12.43 mi3.11 mi3140-342990-312990-313363(Top 13%)3191(Top 21%)3191(Top 60%)
Half13.11 mi0.68 mi3102+382956+342956+342667(Top 10%)2561(Top 17%)2561(Top 48%)
25K15.53 mi2.42 mi3180-783028-723028-723790(Top 14%)3564(Top 23%)3564(Top 67%)
30K18.64 mi3.11 mi31803029-13029-13503(Top 13%)3294(Top 22%)3294(Top 62%)
20M20.00 mi1.36 mi3211-313051-223051-223956(Top 15%)3672(Top 24%)3672(Top 69%)
21M21.00 mi1.00 mi3258-473087-363087-364105(Top 15%)3774(Top 25%)3774(Top 71%)
35K21.75 mi0.75 mi3281-233107-203107-204395(Top 17%)4013(Top 26%)4013(Top 76%)
23M23.00 mi1.25 mi3307-263132-253132-254036(Top 15%)3712(Top 24%)3712(Top 70%)
24M24.00 mi1.00 mi3327-203149-173149-173918(Top 15%)3577(Top 24%)3577(Top 68%)
40K24.85 mi0.85 mi3346-193165-163165-164118(Top 15%)3679(Top 24%)3679(Top 70%)
25.2M25.20 mi0.35 mi3373-273186-213186-214960(Top 19%)4237(Top 28%)4237(Top 80%)
Finish26.22 mi1.02 mi3439-663242-563242-565167(Top 19%)4375(Top 29%)4375(Top 83%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 15%
×21story building
+97ft-345ft

Overall

4024

Males

3780

M18-39

3780

5K→10K

3.1 - 6.2 mi

Top 12%
×5story building
+79ft-138ft

Overall

3289

Males

3131

M18-39

3131

10K→15K

6.2 - 9.3 mi

Top 15%
×3story building
+67ft-78ft

Overall

4024

Males

3780

M18-39

3780

15K→20K

9.3 - 12.4 mi

Top 13%
×5story building
+106ft-86ft

Overall

3363

Males

3191

M18-39

3191

20K→Half

12.4 - 13.1 mi

Top 10%
×2story building
+19ft-37ft

Overall

2667

Males

2561

M18-39

2561

Half→25K

13.1 - 15.5 mi

Top 14%
×4story building
+66ft-88ft

Overall

3790

Males

3564

M18-39

3564

25K→30K

15.5 - 18.6 mi

Top 13%
×9story building
+181ft-148ft

Overall

3503

Males

3294

M18-39

3294

30K→20M

18.6 - 20.0 mi

Top 15%
×5story building
+64ft-50ft

Overall

3956

Males

3672

M18-39

3672

20M→21M

20.0 - 21.0 mi

Top 15%
×8story building
+106ft-24ft

Overall

4105

Males

3774

M18-39

3774

21M→35K

21.0 - 21.8 mi

Top 17%
×7story building
+17ft-86ft

Overall

4395

Males

4013

M18-39

4013

35K→23M

21.8 - 23.0 mi

Top 15%
×5story building
+23ft-63ft

Overall

4036

Males

3712

M18-39

3712

23M→24M

23.0 - 24.0 mi

Top 15%
×6story building
+12ft-82ft

Overall

3918

Males

3577

M18-39

3577

24M→40K

24.0 - 24.9 mi

Top 15%
×1story
+6ft-20ft

Overall

4118

Males

3679

M18-39

3679

40K→25.2M

24.9 - 25.2 mi

Top 19%
×1story
+13ft-16ft

Overall

4960

Males

4237

M18-39

4237

25.2M→Finish

25.2 - 26.2 mi

Top 19%
×2story building
+22ft-21ft

Overall

5167

Males

4375

M18-39

4375

Passing Analysis

Category:
Athletes Passed
542
Passed By
1693
Net Change
-1151
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2288
5K → 10K25450-425#2288#2713
10K → 15K11404-393#2713#3106
15K → 20K77111-34#3106#3140
20K → Half413+38#3140#3102
Half → 25K36114-78#3102#3180
25K → 30K98980#3180#3180
30K → 20M4677-31#3180#3211
20M → 21M3077-47#3211#3258
21M → 35K2447-23#3258#3281
35K → 23M4571-26#3281#3307
23M → 24M3555-20#3307#3327
24M → 40K2948-19#3327#3346
40K → 25.2M1542-27#3346#3373
25.2M → Finish3096-66#3373#3439
TOTALS5421693-1151
📊

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