Boston Marathon logo
BOSTON MARATHON 2023

Jason Grosser

TN

Bib: 10453 M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 24%
Gender (Male)
#0 / 15176
Top 37%
Masters (Masters Men)
#0 / 9891
Top 23%
Division (M50-54)
#0 / 2052
Top 17%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:19/mi
22:45
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
6:58/mi
44:25
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
6:50/mi
1:05:38
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
6:58/mi
1:27:18
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
6:52/mi
1:31:59
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:06/mi
1:49:13
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:27/mi
2:12:22
↑ 181↓ 1480.2%
138 ft elev
20M
7:32/mi
2:22:36
↑ 64↓ 500.2%
148 ft elev
21M
8:11/mi
2:30:47
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
7:02/mi
2:36:03
↑ 17↓ 861.7%
156 ft elev
23M
7:27/mi
2:45:23
↑ 23↓ 630.6%
116 ft elev
24M
7:19/mi
2:52:42
↓ 821.3%
34 ft elev
40K· 24.85 mi
7:29/mi
2:59:06
↓ 200.3%
20 ft elev
25.2M
8:13/mi
3:01:56
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
7:35/mi
3:09:40
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Is this your race?

Claim it for a free AI report

A coach's-eye read of your race — emailed to you, free.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:31:59
Pace7:01 /mi
2nd Half
Distance13.11 mi
Time1:37:41
Pace7:27 /mi
📊Positive Split: 6.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:49:2422:457:1922:45
7:19
-
10K
6.21 mi11:11:0444:257:0921:40
6:58
-0:21
15K
9.32 mi11:32:171:05:387:0321:13
6:50
-0:08
20K
12.43 mi11:53:571:27:187:0121:40
6:58
+0:08
Half
13.11 mi11:58:381:31:597:014:41
6:52
-0:06
25K
15.53 mi12:15:521:49:137:0217:14
7:06
+0:14
30K
18.64 mi12:39:012:12:227:0623:09
7:27
+0:21
20M
20.00 mi12:49:152:22:367:0810:14
7:32
+0:05
21M
21.00 mi12:57:262:30:477:118:11
8:11
+0:39
35K
21.75 mi13:02:422:36:037:115:16
7:02
-1:09
23M
23.00 mi13:12:022:45:237:119:20
7:27
+0:25
24M
24.00 mi13:19:212:52:427:127:19
7:19
-0:08
40K
24.85 mi13:25:452:59:067:126:24
7:29
+0:10
25.2M
25.20 mi13:28:353:01:567:132:50
8:13
+0:44
Finish
26.22 mi13:36:193:09:407:147:44
7:35
-0:38

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

6:50 /mi

Average Pace

7:14 /mi

Slowest Pace

8:13 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:31:44

48% of race

Time at Steady Pace

1:08:57

36% of race

Time at Slower Pace

28:59

15% of race

Average Pace: 7:14 /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 mi10:49:2422:457:1922:45
7:19
#8240
10K
6.21 mi11:11:0444:257:0921:40
6:58
#7413
15K
9.32 mi11:32:171:05:387:0321:13
6:50
#6735
20K
12.43 mi11:53:571:27:187:0121:40
6:58
#6486
Half
13.11 mi11:58:381:31:597:014:41
6:52
#6449
25K
15.53 mi12:15:521:49:137:0217:14
7:06
#6393
30K
18.64 mi12:39:012:12:227:0623:09
7:27
#6412
20M
20.00 mi12:49:152:22:367:0810:14
7:32
#6409
21M
21.00 mi12:57:262:30:477:118:11
8:11
#6458
35K
21.75 mi13:02:422:36:037:115:16
7:02
#6399
23M
23.00 mi13:12:022:45:237:119:20
7:27
#6347
24M
24.00 mi13:19:212:52:427:127:19
7:19
#6294
40K
24.85 mi13:25:452:59:067:126:24
7:29
#6266
25.2M
25.20 mi13:28:353:01:567:132:50
8:13
#6284
Finish
26.22 mi13:36:193:09:407:147:44
7:35
#6342
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi8240712471245393(Top 20%)4978(Top 33%)4978(Top 243%)
10K6.21 mi3.10 mi7413+8276571+5536571+5536641(Top 25%)5963(Top 39%)5963(Top 291%)
15K9.32 mi3.11 mi6735+6786058+5136058+5135393(Top 20%)4978(Top 33%)4978(Top 243%)
20K12.43 mi3.11 mi6486+2495851+2075851+2075833(Top 22%)5342(Top 35%)5342(Top 260%)
Half13.11 mi0.68 mi6449+375821+305821+305787(Top 22%)5319(Top 35%)5319(Top 259%)
25K15.53 mi2.42 mi6393+565773+485773+486154(Top 23%)5556(Top 37%)5556(Top 271%)
30K18.64 mi3.11 mi6412-195780-75780-76885(Top 26%)5987(Top 39%)5987(Top 292%)
20M20.00 mi1.36 mi6409+35764+165764+166969(Top 26%)5947(Top 39%)5947(Top 290%)
21M21.00 mi1.00 mi6458-495779-155779-158482(Top 32%)6749(Top 44%)6749(Top 329%)
35K21.75 mi0.75 mi6399+595738+415738+415563(Top 21%)4926(Top 32%)4926(Top 240%)
23M23.00 mi1.25 mi6347+525684+545684+546160(Top 23%)5289(Top 35%)5289(Top 258%)
24M24.00 mi1.00 mi6294+535636+485636+486464(Top 24%)5394(Top 36%)5394(Top 263%)
40K24.85 mi0.85 mi6266+285598+385598+386612(Top 25%)5400(Top 36%)5400(Top 263%)
25.2M25.20 mi0.35 mi6284-185607-95607-97702(Top 29%)5978(Top 39%)5978(Top 291%)
Finish26.22 mi1.02 mi6342-585645-385645-389161(Top 34%)6831(Top 45%)6831(Top 333%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 20%
×21story building
+97ft-345ft

Overall

5393

Males

4978

M50-54

4978

5K→10K

3.1 - 6.2 mi

Top 25%
×5story building
+79ft-138ft

Overall

6641

Males

5963

M50-54

5963

10K→15K

6.2 - 9.3 mi

Top 20%
×3story building
+67ft-78ft

Overall

5393

Males

4978

M50-54

4978

15K→20K

9.3 - 12.4 mi

Top 22%
×5story building
+106ft-86ft

Overall

5833

Males

5342

M50-54

5342

20K→Half

12.4 - 13.1 mi

Top 22%
×2story building
+19ft-37ft

Overall

5787

Males

5319

M50-54

5319

Half→25K

13.1 - 15.5 mi

Top 23%
×4story building
+66ft-88ft

Overall

6154

Males

5556

M50-54

5556

25K→30K

15.5 - 18.6 mi

Top 26%
×9story building
+181ft-148ft

Overall

6885

Males

5987

M50-54

5987

30K→20M

18.6 - 20.0 mi

Top 26%
×5story building
+64ft-50ft

Overall

6969

Males

5947

M50-54

5947

20M→21M

20.0 - 21.0 mi

Top 32%
×8story building
+106ft-24ft

Overall

8482

Males

6749

M50-54

6749

21M→35K

21.0 - 21.8 mi

Top 21%
×7story building
+17ft-86ft

Overall

5563

Males

4926

M50-54

4926

35K→23M

21.8 - 23.0 mi

Top 23%
×5story building
+23ft-63ft

Overall

6160

Males

5289

M50-54

5289

23M→24M

23.0 - 24.0 mi

Top 24%
×6story building
+12ft-82ft

Overall

6464

Males

5394

M50-54

5394

24M→40K

24.0 - 24.9 mi

Top 25%
×1story
+6ft-20ft

Overall

6612

Males

5400

M50-54

5400

40K→25.2M

24.9 - 25.2 mi

Top 29%
×1story
+13ft-16ft

Overall

7702

Males

5978

M50-54

5978

25.2M→Finish

25.2 - 26.2 mi

Top 34%
×2story building
+22ft-21ft

Overall

9161

Males

6831

M50-54

6831

Passing Analysis

Category:
Athletes Passed
2502
Passed By
604
Net Change
+1898
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8240
5K → 10K85225+827#8240#7413
10K → 15K6824+678#7413#6735
15K → 20K26617+249#6735#6486
20K → Half403+37#6486#6449
Half → 25K9943+56#6449#6393
25K → 30K111130-19#6393#6412
30K → 20M6158+3#6412#6409
20M → 21M4695-49#6409#6458
21M → 35K689+59#6458#6399
35K → 23M8836+52#6399#6347
23M → 24M8532+53#6347#6294
24M → 40K5729+28#6294#6266
40K → 25.2M1735-18#6266#6284
25.2M → Finish3088-58#6284#6342
TOTALS2502604+1898
📊

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