Boston Marathon logo
BOSTON MARATHON 2023

Jeffrey Ostrum

Bib: 27184•M

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M50-54)
#0 / 2052
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
10:02/mi
31:09
↑ 97↓ 3451.5%
10K· 6.21 mi
9:50/mi
1:01:42
↑ 79↓ 1380.4%
15K· 9.32 mi
9:51/mi
1:32:17
↑ 67↓ 78
20K· 12.43 mi
9:58/mi
2:03:15
↑ 106↓ 860.1%
Half· 13.11 mi
9:46/mi
2:09:55
↑ 19↓ 370.5%
25K· 15.53 mi
10:12/mi
2:34:39
↑ 66↓ 880.2%
30K· 18.64 mi
10:22/mi
3:06:50
↑ 181↓ 1480.2%
20M
10:25/mi
3:21:00
↑ 64↓ 500.2%
21M
10:51/mi
3:31:51
↑ 106↓ 241.6%
35K· 21.75 mi
9:47/mi
3:39:10
↑ 17↓ 861.7%
23M
10:10/mi
3:51:54
↑ 23↓ 630.6%
24M
10:02/mi
4:01:56
↓ 821.3%
40K· 24.85 mi
10:16/mi
4:10:43
↓ 200.3%
25.2M
11:04/mi
4:14:32
↑ 13↓ 160.2%
Finish· 26.22 mi
9:47/mi
4:24:30
↑ 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
Time2:09:55
Pace9:55 /mi
2nd Half
Distance13.11 mi
Time2:14:35
Pace10:16 /mi
📊Positive Split: 3.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:53:3131:0910:0231:09
10:02
-
10K
6.21 mi12:24:041:01:429:5630:33
9:50
-0:12
15K
9.32 mi12:54:391:32:179:5430:35
9:51
+0:01
20K
12.43 mi13:25:372:03:159:5530:58
9:58
+0:07
Half
13.11 mi13:32:172:09:559:556:40
9:46
-0:12
25K
15.53 mi13:57:012:34:399:5724:44
10:12
+0:26
30K
18.64 mi14:29:123:06:5010:0132:11
10:22
+0:10
20M
20.00 mi14:43:223:21:0010:0314:10
10:25
+0:03
21M
21.00 mi14:54:133:31:5110:0510:51
10:51
+0:26
35K
21.75 mi15:01:323:39:1010:057:19
9:47
-1:04
23M
23.00 mi15:14:163:51:5410:0512:44
10:10
+0:23
24M
24.00 mi15:24:184:01:5610:0510:02
10:02
-0:08
40K
24.85 mi15:33:054:10:4310:058:47
10:16
+0:14
25.2M
25.20 mi15:36:544:14:3210:063:49
11:04
+0:48
Finish
26.22 mi15:46:524:24:3010:069:58
9:47
-1:17

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

9:46 /mi

Average Pace

10:06 /mi

Slowest Pace

11:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

4:09:50

94% of race

Time at Steady Pace

14:40

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 10:05 /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 mi11:53:3131:0910:0231:09
10:02
#23499
10K
6.21 mi12:24:041:01:429:5630:33
9:50
#23463
15K
9.32 mi12:54:391:32:179:5430:35
9:51
#23371
20K
12.43 mi13:25:372:03:159:5530:58
9:58
#23243
Half
13.11 mi13:32:172:09:559:556:40
9:46
#23206
25K
15.53 mi13:57:012:34:399:5724:44
10:12
#23076
30K
18.64 mi14:29:123:06:5010:0132:11
10:22
#22842
20M
20.00 mi14:43:223:21:0010:0314:10
10:25
#22743
21M
21.00 mi14:54:133:31:5110:0510:51
10:51
#22639
35K
21.75 mi15:01:323:39:1010:057:19
9:47
#22552
23M
23.00 mi15:14:163:51:5410:0512:44
10:10
#22443
24M
24.00 mi15:24:184:01:5610:0510:02
10:02
#22388
40K
24.85 mi15:33:054:10:4310:058:47
10:16
#22321
25.2M
25.20 mi15:36:544:14:3210:063:49
11:04
#22291
Finish
26.22 mi15:46:524:24:3010:069:58
9:47
#22265
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi23499138321383223163(Top 87%)13709(Top 90%)13709(Top 668%)
10K6.21 mi3.10 mi23463+3613837-513837-523341(Top 88%)13785(Top 91%)13785(Top 672%)
15K9.32 mi3.11 mi23371+9213808+2913808+2923163(Top 87%)13709(Top 90%)13709(Top 668%)
20K12.43 mi3.11 mi23243+12813743+6513743+6522826(Top 86%)13546(Top 89%)13546(Top 660%)
Half13.11 mi0.68 mi23206+3713725+1813725+1822790(Top 86%)13529(Top 89%)13529(Top 659%)
25K15.53 mi2.42 mi23076+13013656+6913656+6922615(Top 85%)13414(Top 88%)13414(Top 654%)
30K18.64 mi3.11 mi22842+23413519+13713519+13721905(Top 82%)13031(Top 86%)13031(Top 635%)
20M20.00 mi1.36 mi22743+9913459+6013459+6021561(Top 81%)12806(Top 84%)12806(Top 624%)
21M21.00 mi1.00 mi22639+10413398+6113398+6120499(Top 77%)12290(Top 81%)12290(Top 599%)
35K21.75 mi0.75 mi22552+8713359+3913359+3920689(Top 78%)12344(Top 81%)12344(Top 602%)
23M23.00 mi1.25 mi22443+10913301+5813301+5820483(Top 77%)12243(Top 81%)12243(Top 597%)
24M24.00 mi1.00 mi22388+5513268+3313268+3320879(Top 78%)12381(Top 82%)12381(Top 603%)
40K24.85 mi0.85 mi22321+6713235+3313235+3320666(Top 78%)12223(Top 81%)12223(Top 596%)
25.2M25.20 mi0.35 mi22291+3013218+1713218+1720599(Top 77%)12206(Top 80%)12206(Top 595%)
Finish26.22 mi1.02 mi22265+2613196+2213196+2221079(Top 79%)12460(Top 82%)12460(Top 607%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 87%
×21story building
+97ft-345ft

Overall

23163

Males

13709

M50-54

13709

5K→10K

3.1 - 6.2 mi

Top 88%
×5story building
+79ft-138ft

Overall

23341

Males

13785

M50-54

13785

10K→15K

6.2 - 9.3 mi

Top 87%
×3story building
+67ft-78ft

Overall

23163

Males

13709

M50-54

13709

15K→20K

9.3 - 12.4 mi

Top 86%
×5story building
+106ft-86ft

Overall

22826

Males

13546

M50-54

13546

20K→Half

12.4 - 13.1 mi

Top 86%
×2story building
+19ft-37ft

Overall

22790

Males

13529

M50-54

13529

Half→25K

13.1 - 15.5 mi

Top 85%
×4story building
+66ft-88ft

Overall

22615

Males

13414

M50-54

13414

25K→30K

15.5 - 18.6 mi

Top 82%
×9story building
+181ft-148ft

Overall

21905

Males

13031

M50-54

13031

30K→20M

18.6 - 20.0 mi

Top 81%
×5story building
+64ft-50ft

Overall

21561

Males

12806

M50-54

12806

20M→21M

20.0 - 21.0 mi

Top 77%
×8story building
+106ft-24ft

Overall

20499

Males

12290

M50-54

12290

21M→35K

21.0 - 21.8 mi

Top 78%
×7story building
+17ft-86ft

Overall

20689

Males

12344

M50-54

12344

35K→23M

21.8 - 23.0 mi

Top 77%
×5story building
+23ft-63ft

Overall

20483

Males

12243

M50-54

12243

23M→24M

23.0 - 24.0 mi

Top 78%
×6story building
+12ft-82ft

Overall

20879

Males

12381

M50-54

12381

24M→40K

24.0 - 24.9 mi

Top 78%
×1story
+6ft-20ft

Overall

20666

Males

12223

M50-54

12223

40K→25.2M

24.9 - 25.2 mi

Top 77%
×1story
+13ft-16ft

Overall

20599

Males

12206

M50-54

12206

25.2M→Finish

25.2 - 26.2 mi

Top 79%
×2story building
+22ft-21ft

Overall

21079

Males

12460

M50-54

12460

Passing Analysis

Category:
Athletes Passed
1718
Passed By
484
Net Change
+1234
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23499
5K → 10K227191+36#23499#23463
10K → 15K17886+92#23463#23371
15K → 20K18254+128#23371#23243
20K → Half469+37#23243#23206
Half → 25K17646+130#23206#23076
25K → 30K25824+234#23076#22842
30K → 20M11314+99#22842#22743
20M → 21M1106+104#22743#22639
21M → 35K925+87#22639#22552
35K → 23M1189+109#22552#22443
23M → 24M638+55#22443#22388
24M → 40K7811+67#22388#22321
40K → 25.2M344+30#22321#22291
25.2M → Finish4317+26#22291#22265
TOTALS1718484+1234
📊

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