Boston Marathon logo
BOSTON MARATHON 2023

Natascha Lauzon

Bib: 18326•F

IN

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Gender (Female)
#0 / 11423
Division (F18-39)
#0 / 4884
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
27:52
Rank: #20319
Start → 5K
27:52 | 8:58/mi
10K· 6.21 mi
55:37
Rank: #20429 (-110)
5K → 10K
27:45 | 8:56/mi
15K· 9.32 mi
1:23:09
Rank: #20227 (+202)
10K → 15K
27:32 | 8:52/mi
20K· 12.43 mi
1:51:15
Rank: #20125 (+102)
15K → 20K
28:06 | 9:03/mi
Half· 13.11 mi
1:57:14
Rank: #20092 (+33)
20K → Half
5:59 | 8:46/mi
25K· 15.53 mi
2:21:20
Rank: #20557 (-465)
Half → 25K
24:06 | 9:56/mi
30K· 18.64 mi
2:54:32
Rank: #21061 (-504)
25K → 30K
33:12 | 10:41/mi
20M
3:11:37
Rank: #21550 (-489)
30K → 20M
17:05 | 12:34/mi
21M
3:26:18
Rank: #21997 (-447)
20M → 21M
14:41 | 14:41/mi
35K· 21.75 mi
3:37:03
Rank: #22330 (-333)
21M → 35K
10:45 | 14:22/mi
23M
3:56:17
Rank: #22864 (-534)
35K → 23M
19:14 | 15:22/mi
24M
4:10:26
Rank: #23155 (-291)
23M → 24M
14:09 | 14:09/mi
40K· 24.85 mi
4:24:21
Rank: #23498 (-343)
24M → 40K
13:55 | 16:17/mi
25.2M
4:28:20
Rank: #23461 (+37)
40K → 25.2M
3:59 | 11:33/mi
Finish· 26.22 mi
4:38:19
Rank: #23390 (+71)
25.2M → Finish
9:59 | 9:48/mi

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
Time1:57:14
Pace8:57 /mi
2nd Half
Distance13.11 mi
Time2:41:05
Pace12:17 /mi
📊Positive Split: 37.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:20:1827:528:5827:52
8:58
-
10K
6.21 mi11:48:0355:378:5727:45
8:56
-0:02
15K
9.32 mi12:15:351:23:098:5527:32
8:52
-0:04
20K
12.43 mi12:43:411:51:158:5728:06
9:03
+0:11
Half
13.11 mi12:49:401:57:148:575:59
8:46
-0:17
25K
15.53 mi13:13:462:21:209:0624:06
9:56
+1:10
30K
18.64 mi13:46:582:54:329:2233:12
10:41
+0:45
20M
20.00 mi14:04:033:11:379:3517:05
12:34
+1:53
21M
21.00 mi14:18:443:26:189:4914:41
14:41
+2:07
35K
21.75 mi14:29:293:37:039:5910:45
14:22
-0:19
23M
23.00 mi14:48:433:56:1710:1619:14
15:22
+1:00
24M
24.00 mi15:02:524:10:2610:2614:09
14:09
-1:13
40K
24.85 mi15:16:474:24:2110:3813:55
16:17
+2:08
25.2M
25.20 mi15:20:464:28:2010:393:59
11:33
-4:44
Finish
26.22 mi15:30:454:38:1910:379:59
9:48
-1:45

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

8:46 /mi

Average Pace

10:37 /mi

Slowest Pace

16:17 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:57:14

42% of race

Time at Steady Pace

1:11:16

26% of race

Time at Slower Pace

1:29:49

32% of race

Average Pace: 10:37 /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 mi11:20:1827:528:5827:52
8:58
#20319
10K
6.21 mi11:48:0355:378:5727:45
8:56
#20429
15K
9.32 mi12:15:351:23:098:5527:32
8:52
#20227
20K
12.43 mi12:43:411:51:158:5728:06
9:03
#20125
Half
13.11 mi12:49:401:57:148:575:59
8:46
#20092
25K
15.53 mi13:13:462:21:209:0624:06
9:56
#20557
30K
18.64 mi13:46:582:54:329:2233:12
10:41
#21061
20M
20.00 mi14:04:033:11:379:3517:05
12:34
#21550
21M
21.00 mi14:18:443:26:189:4914:41
14:41
#21997
35K
21.75 mi14:29:293:37:039:5910:45
14:22
#22330
23M
23.00 mi14:48:433:56:1710:1619:14
15:22
#22864
24M
24.00 mi15:02:524:10:2610:2614:09
14:09
#23155
40K
24.85 mi15:16:474:24:2110:3813:55
16:17
#23498
25.2M
25.20 mi15:20:464:28:2010:393:59
11:33
#23461
Finish
26.22 mi15:30:454:38:1910:379:59
9:48
#23390
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi203198009800919863(Top 75%)7612(Top 67%)7612(Top 156%)
10K6.21 mi3.10 mi20429-1107992+177992+1720609(Top 77%)8047(Top 70%)8047(Top 165%)
15K9.32 mi3.11 mi20227+2027863+1297863+12919863(Top 75%)7612(Top 67%)7612(Top 156%)
20K12.43 mi3.11 mi20125+1027785+787785+7819917(Top 75%)7634(Top 67%)7634(Top 156%)
Half13.11 mi0.68 mi20092+337769+167769+1619403(Top 73%)7336(Top 64%)7336(Top 150%)
25K15.53 mi2.42 mi20557-4658013-2448013-24422095(Top 83%)8891(Top 78%)8891(Top 182%)
30K18.64 mi3.11 mi21061-5048319-3068319-30622589(Top 85%)9235(Top 81%)9235(Top 189%)
20M20.00 mi1.36 mi21550-4898592-2738592-27324814(Top 93%)10508(Top 92%)10508(Top 215%)
21M21.00 mi1.00 mi21997-4478852-2608852-26025548(Top 96%)10878(Top 95%)10878(Top 223%)
35K21.75 mi0.75 mi22330-3339056-2049056-20426259(Top 99%)11254(Top 99%)11254(Top 230%)
23M23.00 mi1.25 mi22864-5349359-3039359-30326375(Top 99%)11317(Top 99%)11317(Top 232%)
24M24.00 mi1.00 mi23155-2919509-1509509-15026130(Top 98%)11222(Top 98%)11222(Top 230%)
40K24.85 mi0.85 mi23498-3439694-1859694-18526463(Top 99%)11365(Top 99%)11365(Top 233%)
25.2M25.20 mi0.35 mi23461+379684+109684+1021709(Top 82%)8976(Top 79%)8976(Top 184%)
Finish26.22 mi1.02 mi23390+719658+269658+2621171(Top 80%)8653(Top 76%)8653(Top 177%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 75%
×21stories
+97ft-345ft

Overall

19863

Females

7612

F18-39

7612

5K→10K

3.1 - 6.2 mi

Top 77%
×5stories
+79ft-138ft

Overall

20609

Females

8047

F18-39

8047

10K→15K

6.2 - 9.3 mi

Top 75%
×3stories
+67ft-78ft

Overall

19863

Females

7612

F18-39

7612

15K→20K

9.3 - 12.4 mi

Top 75%
×5stories
+106ft-86ft

Overall

19917

Females

7634

F18-39

7634

20K→Half

12.4 - 13.1 mi

Top 73%
×2stories
+19ft-37ft

Overall

19403

Females

7336

F18-39

7336

Half→25K

13.1 - 15.5 mi

Top 83%
×4stories
+66ft-88ft

Overall

22095

Females

8891

F18-39

8891

25K→30K

15.5 - 18.6 mi

Top 85%
×9stories
+181ft-148ft

Overall

22589

Females

9235

F18-39

9235

30K→20M

18.6 - 20.0 mi

Top 93%
×5stories
+64ft-50ft

Overall

24814

Females

10508

F18-39

10508

20M→21M

20.0 - 21.0 mi

Top 96%
×8stories
+106ft-24ft

Overall

25548

Females

10878

F18-39

10878

21M→35K

21.0 - 21.8 mi

Top 99%
×7stories
+17ft-86ft

Overall

26259

Females

11254

F18-39

11254

35K→23M

21.8 - 23.0 mi

Top 99%
×5stories
+23ft-63ft

Overall

26375

Females

11317

F18-39

11317

23M→24M

23.0 - 24.0 mi

Top 98%
×6stories
+12ft-82ft

Overall

26130

Females

11222

F18-39

11222

24M→40K

24.0 - 24.9 mi

Top 99%
×1story
+6ft-20ft

Overall

26463

Females

11365

F18-39

11365

40K→25.2M

24.9 - 25.2 mi

Top 82%
×1story
+13ft-16ft

Overall

21709

Females

8976

F18-39

8976

25.2M→Finish

25.2 - 26.2 mi

Top 80%
×2stories
+22ft-21ft

Overall

21171

Females

8653

F18-39

8653

Passing Analysis

Category:
Athletes Passed
1011
Passed By
4082
Net Change
-3071
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20319
5K → 10K241351-110#20319#20429
10K → 15K29492+202#20429#20227
15K → 20K212110+102#20227#20125
20K → Half5017+33#20125#20092
Half → 25K25490-465#20092#20557
25K → 30K41545-504#20557#21061
30K → 20M11500-489#21061#21550
20M → 21M3450-447#21550#21997
21M → 35K2335-333#21997#22330
35K → 23M4538-534#22330#22864
23M → 24M3294-291#22864#23155
24M → 40K3346-343#23155#23498
40K → 25.2M436+37#23498#23461
25.2M → Finish798+71#23461#23390
TOTALS10114082-3071
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing