Boston Marathon logo
BOSTON MARATHON 2023

Peter Zelken

CT

Bib: 31954 M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 22%
Gender (Male)
#0 / 15176
Top 34%
Masters (Masters Men)
#0 / 9891
Top 20%
Division (M40-44)
#0 / 2241
Top 46%
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
7:23/mi
22:55
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
6:58/mi
44:35
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:02/mi
1:06:25
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:06/mi
1:28:30
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
6:58/mi
1:33:15
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:09/mi
1:50:36
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:11/mi
2:12:56
↑ 181↓ 1480.2%
138 ft elev
20M
7:13/mi
2:22:45
↑ 64↓ 500.2%
148 ft elev
21M
7:26/mi
2:30:11
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
7:08/mi
2:35:31
↑ 17↓ 861.7%
156 ft elev
23M
7:18/mi
2:44:40
↑ 23↓ 630.6%
116 ft elev
24M
7:07/mi
2:51:47
↓ 821.3%
34 ft elev
40K· 24.85 mi
7:13/mi
2:57:57
↓ 200.3%
20 ft elev
25.2M
7:29/mi
3:00:32
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
6:35/mi
3:07:15
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:33:157:07 /mi⚖️ balanced
2nd Half
1:34:007:10 /mi⚖️ balanced
Even split — consistent pacing between halves
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:41:1122:557:2322:55
7:23
-
10K
6.21 mi12:02:5144:357:1021:40
6:58
-0:25
15K
9.32 mi12:24:411:06:257:0821:50
7:02
+0:04
20K
12.43 mi12:46:461:28:307:0722:05
7:06
+0:04
Half
13.11 mi12:51:311:33:157:074:45
6:58
-0:08
25K
15.53 mi13:08:521:50:367:0717:21
7:09
+0:11
30K
18.64 mi13:31:122:12:567:0822:20
7:11
+0:02
20M
20.00 mi13:41:012:22:457:089:49
7:13
+0:02
21M
21.00 mi13:48:272:30:117:097:26
7:26
+0:13
35K
21.75 mi13:53:472:35:317:095:20
7:08
-0:18
23M
23.00 mi14:02:562:44:407:109:09
7:18
+0:10
24M
24.00 mi14:10:032:51:477:097:07
7:07
-0:11
40K
24.85 mi14:16:132:57:577:106:10
7:13
+0:06
25.2M
25.20 mi14:18:483:00:327:102:35
7:29
+0:16
Finish
26.22 mi14:25:313:07:157:096:43
6:35
-0:54

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

6:35 /mi

Average Pace

7:09 /mi

Slowest Pace

7:29 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Segment Time Comparison

Time at Faster Pace

2:25:10

78% of race

Time at Steady Pace

42:05

22% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:08 /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 mi11:41:1122:557:2322:55
7:23
#8624
10K
6.21 mi12:02:5144:357:1021:40
6:58
#7590
15K
9.32 mi12:24:411:06:257:0821:50
7:02
#7268
20K
12.43 mi12:46:461:28:307:0722:05
7:06
#7062
Half
13.11 mi12:51:311:33:157:074:45
6:58
#7005
25K
15.53 mi13:08:521:50:367:0717:21
7:09
#6889
30K
18.64 mi13:31:122:12:567:0822:20
7:11
#6574
20M
20.00 mi13:41:012:22:457:089:49
7:13
#6452
21M
21.00 mi13:48:272:30:117:097:26
7:26
#6294
35K
21.75 mi13:53:472:35:317:095:20
7:08
#6257
23M
23.00 mi14:02:562:44:407:109:09
7:18
#6157
24M
24.00 mi14:10:032:51:477:097:07
7:07
#6068
40K
24.85 mi14:16:132:57:577:106:10
7:13
#5986
25.2M
25.20 mi14:18:483:00:327:102:35
7:29
#5938
Finish
26.22 mi14:25:313:07:157:096:43
6:35
#5765
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi862473657365673360356035
10K6.21 mi3.10 mi7590+10346699+6666699+666663759595959
15K9.32 mi3.11 mi7268+3226450+2496450+249673360356035
20K12.43 mi3.11 mi7062+2066293+1576293+157659059045904
Half13.11 mi0.68 mi7005+576250+436250+43631757275727
25K15.53 mi2.42 mi6889+1166155+956155+95640657265726
30K18.64 mi3.11 mi6574+3155902+2535902+253543249424942
20M20.00 mi1.36 mi6452+1225794+1085794+108524247344734
21M21.00 mi1.00 mi6294+1585665+1295665+129429739373937
35K21.75 mi0.75 mi6257+375633+325633+32605052585258
23M23.00 mi1.25 mi6157+1005543+905543+90534547204720
24M24.00 mi1.00 mi6068+895459+845459+84528346284628
40K24.85 mi0.85 mi5986+825385+745385+74494943164316
25.2M25.20 mi0.35 mi5938+485345+405345+40389034803480
Finish26.22 mi1.02 mi5765+1735202+1435202+143295826832683

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 25%
×21story building
+97ft-345ft

Overall

6733

Males

6035

M40-44

6035

5K→10K

3.1 - 6.2 mi

Top 25%
×5story building
+79ft-138ft

Overall

6637

Males

5959

M40-44

5959

10K→15K

6.2 - 9.3 mi

Top 25%
×3story building
+67ft-78ft

Overall

6733

Males

6035

M40-44

6035

15K→20K

9.3 - 12.4 mi

Top 25%
×5story building
+106ft-86ft

Overall

6590

Males

5904

M40-44

5904

20K→Half

12.4 - 13.1 mi

Top 24%
×2story building
+19ft-37ft

Overall

6317

Males

5727

M40-44

5727

Half→25K

13.1 - 15.5 mi

Top 24%
×4story building
+66ft-88ft

Overall

6406

Males

5726

M40-44

5726

25K→30K

15.5 - 18.6 mi

Top 20%
×9story building
+181ft-148ft

Overall

5432

Males

4942

M40-44

4942

30K→20M

18.6 - 20.0 mi

Top 20%
×5story building
+64ft-50ft

Overall

5242

Males

4734

M40-44

4734

20M→21M

20.0 - 21.0 mi

Top 16%
×8story building
+106ft-24ft

Overall

4297

Males

3937

M40-44

3937

21M→35K

21.0 - 21.8 mi

Top 23%
×7story building
+17ft-86ft

Overall

6050

Males

5258

M40-44

5258

35K→23M

21.8 - 23.0 mi

Top 20%
×5story building
+23ft-63ft

Overall

5345

Males

4720

M40-44

4720

23M→24M

23.0 - 24.0 mi

Top 20%
×6story building
+12ft-82ft

Overall

5283

Males

4628

M40-44

4628

24M→40K

24.0 - 24.9 mi

Top 19%
×1story
+6ft-20ft

Overall

4949

Males

4316

M40-44

4316

40K→25.2M

24.9 - 25.2 mi

Top 15%
×1story
+13ft-16ft

Overall

3890

Males

3480

M40-44

3480

25.2M→Finish

25.2 - 26.2 mi

Top 11%
×2story building
+22ft-21ft

Overall

2958

Males

2683

M40-44

2683

Passing Analysis

Category:
Athletes Passed
3044
Passed By
185
Net Change
+2859
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8624
5K → 10K105319+1034#8624#7590
10K → 15K35129+322#7590#7268
15K → 20K23125+206#7268#7062
20K → Half581+57#7062#7005
Half → 25K14125+116#7005#6889
25K → 30K3227+315#6889#6574
30K → 20M13715+122#6574#6452
20M → 21M1624+158#6452#6294
21M → 35K4912+37#6294#6257
35K → 23M12020+100#6257#6157
23M → 24M10516+89#6157#6068
24M → 40K897+82#6068#5986
40K → 25.2M524+48#5986#5938
25.2M → Finish1741+173#5938#5765
TOTALS3044185+2859

Passing Charts

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