Boston Marathon logo
BOSTON MARATHON 2023

Carol Stemrich

Bib: 19846•F

WI

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Female)
#0 / 11423
Masters (Masters Women)
#0 / 6539
Division (F65-69)
#0 / 221
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
8:32/mi
26:32
↑ 97↓ 3451.5%
10K· 6.21 mi
8:28/mi
52:51
↑ 79↓ 1380.4%
15K· 9.32 mi
8:26/mi
1:19:02
↑ 67↓ 78
20K· 12.43 mi
8:51/mi
1:46:31
↑ 106↓ 860.1%
Half· 13.11 mi
8:48/mi
1:52:31
↑ 19↓ 370.5%
25K· 15.53 mi
8:59/mi
2:14:17
↑ 66↓ 880.2%
30K· 18.64 mi
9:47/mi
2:44:40
↑ 181↓ 1480.2%
20M
10:59/mi
2:59:36
↑ 64↓ 500.2%
21M
12:57/mi
3:12:33
↑ 106↓ 241.6%
35K· 21.75 mi
12:07/mi
3:21:37
↑ 17↓ 861.7%
23M
13:02/mi
3:37:56
↑ 23↓ 630.6%
24M
12:07/mi
3:50:03
↓ 821.3%
40K· 24.85 mi
14:08/mi
4:02:08
↓ 200.3%
25.2M
15:57/mi
4:07:38
↑ 13↓ 160.2%
Finish· 26.22 mi
16:06/mi
4:24:02
↑ 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
Time1:52:31
Pace8:35 /mi
2nd Half
Distance13.11 mi
Time2:31:31
Pace11:33 /mi
📊Positive Split: 34.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:21:0726:328:3226:32
8:32
-
10K
6.21 mi11:47:2652:518:3026:19
8:28
-0:04
15K
9.32 mi12:13:371:19:028:2926:11
8:26
-0:02
20K
12.43 mi12:41:061:46:318:3427:29
8:51
+0:25
Half
13.11 mi12:47:061:52:318:356:00
8:48
-0:03
25K
15.53 mi13:08:522:14:178:3921:46
8:59
+0:11
30K
18.64 mi13:39:152:44:408:5030:23
9:47
+0:48
20M
20.00 mi13:54:112:59:368:5914:56
10:59
+1:12
21M
21.00 mi14:07:083:12:339:1012:57
12:57
+1:58
35K
21.75 mi14:16:123:21:379:169:04
12:07
-0:50
23M
23.00 mi14:32:313:37:569:2916:19
13:02
+0:55
24M
24.00 mi14:44:383:50:039:3512:07
12:07
-0:55
40K
24.85 mi14:56:434:02:089:4512:05
14:08
+2:01
25.2M
25.20 mi15:02:134:07:389:505:30
15:57
+1:49
Finish
26.22 mi15:18:374:24:0210:0516:24
16:06
+0:09

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

8:26 /mi

Average Pace

10:05 /mi

Slowest Pace

16:06 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:14:17

51% of race

Time at Steady Pace

1:06:30

25% of race

Time at Slower Pace

1:03:15

24% of race

Average Pace: 10:04 /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 mi11:21:0726:328:3226:32
8:32
#17862
10K
6.21 mi11:47:2652:518:3026:19
8:28
#17948
15K
9.32 mi12:13:371:19:028:2926:11
8:26
#17723
20K
12.43 mi12:41:061:46:318:3427:29
8:51
#18033
Half
13.11 mi12:47:061:52:318:356:00
8:48
#18110
25K
15.53 mi13:08:522:14:178:3921:46
8:59
#18240
30K
18.64 mi13:39:152:44:408:5030:23
9:47
#18759
20M
20.00 mi13:54:112:59:368:5914:56
10:59
#19270
21M
21.00 mi14:07:083:12:339:1012:57
12:57
#19802
35K
21.75 mi14:16:123:21:379:169:04
12:07
#20179
23M
23.00 mi14:32:313:37:569:2916:19
13:02
#20726
24M
24.00 mi14:44:383:50:039:3512:07
12:07
#21003
40K
24.85 mi14:56:434:02:089:4512:05
14:08
#21418
25.2M
25.20 mi15:02:134:07:389:505:30
15:57
#21621
Finish
26.22 mi15:18:374:24:0210:0516:24
16:06
#22221
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF65-69Seg. OverallSeg. FemalesSeg. F65-69
5K3.11 mi3.11 mi178626467646717335(Top 65%)6129(Top 54%)6129(Top 2773%)
10K6.21 mi3.10 mi17948-866501-346501-3418080(Top 68%)6528(Top 57%)6528(Top 2954%)
15K9.32 mi3.11 mi17723+2256352+1496352+14917335(Top 65%)6129(Top 54%)6129(Top 2773%)
20K12.43 mi3.11 mi18033-3106535-1836535-18318941(Top 71%)7058(Top 62%)7058(Top 3194%)
Half13.11 mi0.68 mi18110-776576-416576-4119535(Top 73%)7413(Top 65%)7413(Top 3354%)
25K15.53 mi2.42 mi18240-1306672-966672-9618859(Top 71%)7053(Top 62%)7053(Top 3191%)
30K18.64 mi3.11 mi18759-5197006-3347006-33420399(Top 77%)8000(Top 70%)8000(Top 3620%)
20M20.00 mi1.36 mi19270-5117315-3097315-30922695(Top 85%)9357(Top 82%)9357(Top 4234%)
21M21.00 mi1.00 mi19802-5327625-3107625-31024021(Top 90%)10097(Top 88%)10097(Top 4569%)
35K21.75 mi0.75 mi20179-3777865-2407865-24024801(Top 93%)10555(Top 92%)10555(Top 4776%)
23M23.00 mi1.25 mi20726-5478181-3168181-31625120(Top 94%)10695(Top 94%)10695(Top 4839%)
24M24.00 mi1.00 mi21003-2778345-1648345-16424666(Top 93%)10518(Top 92%)10518(Top 4759%)
40K24.85 mi0.85 mi21418-4158580-2358580-23525751(Top 97%)11050(Top 97%)11050(Top 5000%)
25.2M25.20 mi0.35 mi21621-2038698-1188698-11826100(Top 98%)11213(Top 98%)11213(Top 5074%)
Finish26.22 mi1.02 mi22221-6009020-3229020-32226569(Top 100%)11408(Top 100%)11408(Top 5162%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 65%
×21story building
+97ft-345ft

Overall

17335

Females

6129

F65-69

6129

5K→10K

3.1 - 6.2 mi

Top 68%
×5story building
+79ft-138ft

Overall

18080

Females

6528

F65-69

6528

10K→15K

6.2 - 9.3 mi

Top 65%
×3story building
+67ft-78ft

Overall

17335

Females

6129

F65-69

6129

15K→20K

9.3 - 12.4 mi

Top 71%
×5story building
+106ft-86ft

Overall

18941

Females

7058

F65-69

7058

20K→Half

12.4 - 13.1 mi

Top 73%
×2story building
+19ft-37ft

Overall

19535

Females

7413

F65-69

7413

Half→25K

13.1 - 15.5 mi

Top 71%
×4story building
+66ft-88ft

Overall

18859

Females

7053

F65-69

7053

25K→30K

15.5 - 18.6 mi

Top 77%
×9story building
+181ft-148ft

Overall

20399

Females

8000

F65-69

8000

30K→20M

18.6 - 20.0 mi

Top 85%
×5story building
+64ft-50ft

Overall

22695

Females

9357

F65-69

9357

20M→21M

20.0 - 21.0 mi

Top 90%
×8story building
+106ft-24ft

Overall

24021

Females

10097

F65-69

10097

21M→35K

21.0 - 21.8 mi

Top 93%
×7story building
+17ft-86ft

Overall

24801

Females

10555

F65-69

10555

35K→23M

21.8 - 23.0 mi

Top 94%
×5story building
+23ft-63ft

Overall

25120

Females

10695

F65-69

10695

23M→24M

23.0 - 24.0 mi

Top 93%
×6story building
+12ft-82ft

Overall

24666

Females

10518

F65-69

10518

24M→40K

24.0 - 24.9 mi

Top 97%
×1story
+6ft-20ft

Overall

25751

Females

11050

F65-69

11050

40K→25.2M

24.9 - 25.2 mi

Top 98%
×1story
+13ft-16ft

Overall

26100

Females

11213

F65-69

11213

25.2M→Finish

25.2 - 26.2 mi

Top 100%
×2story building
+22ft-21ft

Overall

26569

Females

11408

F65-69

11408

Passing Analysis

Category:
Athletes Passed
888
Passed By
5247
Net Change
-4359
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17862
5K → 10K271357-86#17862#17948
10K → 15K31893+225#17948#17723
15K → 20K90400-310#17723#18033
20K → Half986-77#18033#18110
Half → 25K87217-130#18110#18240
25K → 30K66585-519#18240#18759
30K → 20M13524-511#18759#19270
20M → 21M10542-532#19270#19802
21M → 35K8385-377#19802#20179
35K → 23M5552-547#20179#20726
23M → 24M7284-277#20726#21003
24M → 40K2417-415#21003#21418
40K → 25.2M2205-203#21418#21621
25.2M → Finish0600-600#21621#22221
TOTALS8885247-4359
📊

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