Boston Marathon logo
BOSTON MARATHON 2023

Kaitlin Flaherty

Bib: 30411•F

MI

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

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
8:48/mi
27:21
↑ 97↓ 3451.5%
10K· 6.21 mi
9:26/mi
56:40
↑ 79↓ 1380.4%
15K· 9.32 mi
10:03/mi
1:27:52
↑ 67↓ 78
20K· 12.43 mi
11:14/mi
2:02:45
↑ 106↓ 860.1%
Half· 13.11 mi
11:10/mi
2:10:22
↑ 19↓ 370.5%
25K· 15.53 mi
12:15/mi
2:40:05
↑ 66↓ 880.2%
30K· 18.64 mi
12:32/mi
3:19:01
↑ 181↓ 1480.2%
20M
12:50/mi
3:36:28
↑ 64↓ 500.2%
21M
13:09/mi
3:49:37
↑ 106↓ 241.6%
35K· 21.75 mi
11:40/mi
3:58:21
↑ 17↓ 861.7%
23M
11:59/mi
4:13:21
↑ 23↓ 630.6%
24M
11:30/mi
4:24:51
↓ 821.3%
40K· 24.85 mi
13:21/mi
4:36:16
↓ 200.3%
25.2M
14:13/mi
4:41:10
↑ 13↓ 160.2%
Finish· 26.22 mi
10:22/mi
4:51:44
↑ 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
Time2:10:22
Pace9:57 /mi
2nd Half
Distance13.11 mi
Time2:41:22
Pace12:19 /mi
📊Positive Split: 23.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:0527:218:4827:21
8:48
-
10K
6.21 mi12:15:2456:409:0729:19
9:26
+0:38
15K
9.32 mi12:46:361:27:529:2631:12
10:03
+0:37
20K
12.43 mi13:21:292:02:459:5334:53
11:14
+1:11
Half
13.11 mi13:29:062:10:229:577:37
11:10
-0:04
25K
15.53 mi13:58:492:40:0510:1829:43
12:15
+1:05
30K
18.64 mi14:37:453:19:0110:4138:56
12:32
+0:17
20M
20.00 mi14:55:123:36:2810:4917:27
12:50
+0:18
21M
21.00 mi15:08:213:49:3710:5613:09
13:09
+0:19
35K
21.75 mi15:17:053:58:2110:588:44
11:40
-1:29
23M
23.00 mi15:32:054:13:2111:0115:00
11:59
+0:19
24M
24.00 mi15:43:354:24:5111:0211:30
11:30
-0:29
40K
24.85 mi15:55:004:36:1611:0711:25
13:21
+1:51
25.2M
25.20 mi15:59:544:41:1011:094:54
14:13
+0:52
Finish
26.22 mi16:10:284:51:4411:0810:34
10:22
-3:51

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

8:48 /mi

Average Pace

11:08 /mi

Slowest Pace

14:13 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:38:26

34% of race

Time at Steady Pace

1:47:27

37% of race

Time at Slower Pace

1:25:51

29% of race

Average Pace: 11:08 /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 mi11:46:0527:218:4827:21
8:48
#19494
10K
6.21 mi12:15:2456:409:0729:19
9:26
#21139
15K
9.32 mi12:46:361:27:529:2631:12
10:03
#22075
20K
12.43 mi13:21:292:02:459:5334:53
11:14
#23143
Half
13.11 mi13:29:062:10:229:577:37
11:10
#23302
25K
15.53 mi13:58:492:40:0510:1829:43
12:15
#23787
30K
18.64 mi14:37:453:19:0110:4138:56
12:32
#24127
20M
20.00 mi14:55:123:36:2810:4917:27
12:50
#24242
21M
21.00 mi15:08:213:49:3710:5613:09
13:09
#24239
35K
21.75 mi15:17:053:58:2110:588:44
11:40
#24244
23M
23.00 mi15:32:054:13:2111:0115:00
11:59
#24253
24M
24.00 mi15:43:354:24:5111:0211:30
11:30
#24242
40K
24.85 mi15:55:004:36:1611:0711:25
13:21
#24309
25.2M
25.20 mi15:59:544:41:1011:094:54
14:13
#24336
Finish
26.22 mi16:10:284:51:4411:0810:34
10:22
#24293
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi194947513751323584(Top 89%)9659(Top 85%)9659(Top 198%)
10K6.21 mi3.10 mi21139-16458389-8768389-87622334(Top 84%)9000(Top 79%)9000(Top 184%)
15K9.32 mi3.11 mi22075-9368879-4908879-49023584(Top 89%)9659(Top 85%)9659(Top 198%)
20K12.43 mi3.11 mi23143-10689428-5499428-54924916(Top 94%)10430(Top 91%)10430(Top 214%)
Half13.11 mi0.68 mi23302-1599509-819509-8125161(Top 95%)10581(Top 93%)10581(Top 217%)
25K15.53 mi2.42 mi23787-4859780-2719780-27125359(Top 95%)10711(Top 94%)10711(Top 219%)
30K18.64 mi3.11 mi24127-3409992-2129992-21225026(Top 94%)10577(Top 93%)10577(Top 217%)
20M20.00 mi1.36 mi24242-11510073-8110073-8125044(Top 94%)10625(Top 93%)10625(Top 218%)
21M21.00 mi1.00 mi24239+310081-810081-824260(Top 91%)10230(Top 90%)10230(Top 209%)
35K21.75 mi0.75 mi24244-510092-1110092-1124332(Top 91%)10303(Top 90%)10303(Top 211%)
23M23.00 mi1.25 mi24253-910101-910101-923976(Top 90%)10107(Top 88%)10107(Top 207%)
24M24.00 mi1.00 mi24242+1110103-210103-223878(Top 90%)10098(Top 88%)10098(Top 207%)
40K24.85 mi0.85 mi24309-6710145-4210145-4225237(Top 95%)10789(Top 94%)10789(Top 221%)
25.2M25.20 mi0.35 mi24336-2710164-1910164-1925158(Top 95%)10771(Top 94%)10771(Top 221%)
Finish26.22 mi1.02 mi24293+4310142+2210142+2222745(Top 85%)9530(Top 83%)9530(Top 195%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 89%
×21story building
+97ft-345ft

Overall

23584

Females

9659

F18-39

9659

5K→10K

3.1 - 6.2 mi

Top 84%
×5story building
+79ft-138ft

Overall

22334

Females

9000

F18-39

9000

10K→15K

6.2 - 9.3 mi

Top 89%
×3story building
+67ft-78ft

Overall

23584

Females

9659

F18-39

9659

15K→20K

9.3 - 12.4 mi

Top 94%
×5story building
+106ft-86ft

Overall

24916

Females

10430

F18-39

10430

20K→Half

12.4 - 13.1 mi

Top 95%
×2story building
+19ft-37ft

Overall

25161

Females

10581

F18-39

10581

Half→25K

13.1 - 15.5 mi

Top 95%
×4story building
+66ft-88ft

Overall

25359

Females

10711

F18-39

10711

25K→30K

15.5 - 18.6 mi

Top 94%
×9story building
+181ft-148ft

Overall

25026

Females

10577

F18-39

10577

30K→20M

18.6 - 20.0 mi

Top 94%
×5story building
+64ft-50ft

Overall

25044

Females

10625

F18-39

10625

20M→21M

20.0 - 21.0 mi

Top 91%
×8story building
+106ft-24ft

Overall

24260

Females

10230

F18-39

10230

21M→35K

21.0 - 21.8 mi

Top 91%
×7story building
+17ft-86ft

Overall

24332

Females

10303

F18-39

10303

35K→23M

21.8 - 23.0 mi

Top 90%
×5story building
+23ft-63ft

Overall

23976

Females

10107

F18-39

10107

23M→24M

23.0 - 24.0 mi

Top 90%
×6story building
+12ft-82ft

Overall

23878

Females

10098

F18-39

10098

24M→40K

24.0 - 24.9 mi

Top 95%
×1story
+6ft-20ft

Overall

25237

Females

10789

F18-39

10789

40K→25.2M

24.9 - 25.2 mi

Top 95%
×1story
+13ft-16ft

Overall

25158

Females

10771

F18-39

10771

25.2M→Finish

25.2 - 26.2 mi

Top 85%
×2story building
+22ft-21ft

Overall

22745

Females

9530

F18-39

9530

Passing Analysis

Category:
Athletes Passed
282
Passed By
5081
Net Change
-4799
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19494
5K → 10K121657-1645#19494#21139
10K → 15K13949-936#21139#22075
15K → 20K101078-1068#22075#23143
20K → Half1160-159#23143#23302
Half → 25K10495-485#23302#23787
25K → 30K28368-340#23787#24127
30K → 20M18133-115#24127#24242
20M → 21M4340+3#24242#24239
21M → 35K2328-5#24239#24244
35K → 23M3140-9#24244#24253
23M → 24M3221+11#24253#24242
24M → 40K875-67#24242#24309
40K → 25.2M633-27#24309#24336
25.2M → Finish474+43#24336#24293
TOTALS2825081-4799
📊

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