Boston Marathon logo
BOSTON MARATHON 2023

Katherine Alft

Bib: 18595•F

WI

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Female)
#0 / 11423
Top 42%
Masters (Masters Women)
#0 / 6539
Top 29%
Division (F40-44)
#0 / 1878
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:33
Rank: #15626
Start → 5K
25:33 | 8:13/mi
10K· 6.21 mi
50:35
Rank: #15397 (+229)
5K → 10K
25:02 | 8:03/mi
15K· 9.32 mi
1:15:31
Rank: #15139 (+258)
10K → 15K
24:56 | 8:02/mi
20K· 12.43 mi
1:40:47
Rank: #14943 (+196)
15K → 20K
25:16 | 8:08/mi
Half· 13.11 mi
1:46:15
Rank: #14918 (+25)
20K → Half
5:28 | 8:01/mi
25K· 15.53 mi
2:06:05
Rank: #14766 (+152)
Half → 25K
19:50 | 8:11/mi
30K· 18.64 mi
2:32:41
Rank: #14737 (+29)
25K → 30K
26:36 | 8:34/mi
20M
2:44:34
Rank: #14767 (-30)
30K → 20M
11:53 | 8:45/mi
21M
2:53:59
Rank: #14790 (-23)
20M → 21M
9:25 | 9:25/mi
35K· 21.75 mi
3:00:12
Rank: #14750 (+40)
21M → 35K
6:13 | 8:19/mi
23M
3:11:32
Rank: #14849 (-99)
35K → 23M
11:20 | 9:03/mi
24M
3:20:19
Rank: #14885 (-36)
23M → 24M
8:47 | 8:47/mi
40K· 24.85 mi
3:27:46
Rank: #14840 (+45)
24M → 40K
7:27 | 8:43/mi
25.2M
3:30:54
Rank: #14797 (+43)
40K → 25.2M
3:08 | 9:05/mi
Finish· 26.22 mi
3:39:21
Rank: #14770 (+27)
25.2M → Finish
8:27 | 8:18/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
Time1:46:15
Pace8:06 /mi
2nd Half
Distance13.11 mi
Time1:53:06
Pace8:38 /mi
📊Positive Split: 6.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:16:5525:338:1325:33
8:13
-
10K
6.21 mi11:41:5750:358:0825:02
8:03
-0:10
15K
9.32 mi12:06:531:15:318:0624:56
8:02
-0:01
20K
12.43 mi12:32:091:40:478:0725:16
8:08
+0:06
Half
13.11 mi12:37:371:46:158:065:28
8:01
-0:07
25K
15.53 mi12:57:272:06:058:0719:50
8:11
+0:10
30K
18.64 mi13:24:032:32:418:1126:36
8:34
+0:23
20M
20.00 mi13:35:562:44:348:1411:53
8:45
+0:11
21M
21.00 mi13:45:212:53:598:179:25
9:25
+0:40
35K
21.75 mi13:51:343:00:128:176:13
8:19
-1:06
23M
23.00 mi14:02:543:11:328:2011:20
9:03
+0:44
24M
24.00 mi14:11:413:20:198:218:47
8:47
-0:16
40K
24.85 mi14:19:083:27:468:227:27
8:43
-0:04
25.2M
25.20 mi14:22:163:30:548:223:08
9:05
+0:22
Finish
26.22 mi14:30:433:39:218:228:27
8:18
-0:47

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

8:01 /mi

Average Pace

8:22 /mi

Slowest Pace

9:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:15:28

89% of race

Time at Steady Pace

23:53

11% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:22 /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 mi11:16:5525:338:1325:33
8:13
#15626
10K
6.21 mi11:41:5750:358:0825:02
8:03
#15397
15K
9.32 mi12:06:531:15:318:0624:56
8:02
#15139
20K
12.43 mi12:32:091:40:478:0725:16
8:08
#14943
Half
13.11 mi12:37:371:46:158:065:28
8:01
#14918
25K
15.53 mi12:57:272:06:058:0719:50
8:11
#14766
30K
18.64 mi13:24:032:32:418:1126:36
8:34
#14737
20M
20.00 mi13:35:562:44:348:1411:53
8:45
#14767
21M
21.00 mi13:45:212:53:598:179:25
9:25
#14790
35K
21.75 mi13:51:343:00:128:176:13
8:19
#14750
23M
23.00 mi14:02:543:11:328:2011:20
9:03
#14849
24M
24.00 mi14:11:413:20:198:218:47
8:47
#14885
40K
24.85 mi14:19:083:27:468:227:27
8:43
#14840
25.2M
25.20 mi14:22:163:30:548:223:08
9:05
#14797
Finish
26.22 mi14:30:433:39:218:228:27
8:18
#14770
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi156265055505514612(Top 55%)4455(Top 39%)4455(Top 237%)
10K6.21 mi3.10 mi15397+2294900+1554900+15515227(Top 57%)4814(Top 42%)4814(Top 256%)
15K9.32 mi3.11 mi15139+2584747+1534747+15314612(Top 55%)4455(Top 39%)4455(Top 237%)
20K12.43 mi3.11 mi14943+1964648+994648+9914471(Top 54%)4384(Top 38%)4384(Top 233%)
Half13.11 mi0.68 mi14918+254634+144634+1414562(Top 55%)4431(Top 39%)4431(Top 236%)
25K15.53 mi2.42 mi14766+1524566+684566+6814110(Top 53%)4294(Top 38%)4294(Top 229%)
30K18.64 mi3.11 mi14737+294577-114577-1114704(Top 55%)4752(Top 42%)4752(Top 253%)
20M20.00 mi1.36 mi14767-304617-404617-4015139(Top 57%)5078(Top 44%)5078(Top 270%)
21M21.00 mi1.00 mi14790-234659-424659-4215571(Top 58%)5385(Top 47%)5385(Top 287%)
35K21.75 mi0.75 mi14750+404655+44655+414189(Top 53%)4669(Top 41%)4669(Top 249%)
23M23.00 mi1.25 mi14849-994744-894744-8916320(Top 61%)5920(Top 52%)5920(Top 315%)
24M24.00 mi1.00 mi14885-364784-404784-4016110(Top 61%)5860(Top 51%)5860(Top 312%)
40K24.85 mi0.85 mi14840+454788-44788-414615(Top 55%)5089(Top 45%)5089(Top 271%)
25.2M25.20 mi0.35 mi14797+434771+174771+1713081(Top 49%)4279(Top 37%)4279(Top 228%)
Finish26.22 mi1.02 mi14770+274771477114086(Top 53%)4790(Top 42%)4790(Top 255%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 55%
×21stories
+97ft-345ft

Overall

14612

Females

4455

F40-44

4455

5K→10K

3.1 - 6.2 mi

Top 57%
×5stories
+79ft-138ft

Overall

15227

Females

4814

F40-44

4814

10K→15K

6.2 - 9.3 mi

Top 55%
×3stories
+67ft-78ft

Overall

14612

Females

4455

F40-44

4455

15K→20K

9.3 - 12.4 mi

Top 54%
×5stories
+106ft-86ft

Overall

14471

Females

4384

F40-44

4384

20K→Half

12.4 - 13.1 mi

Top 55%
×2stories
+19ft-37ft

Overall

14562

Females

4431

F40-44

4431

Half→25K

13.1 - 15.5 mi

Top 53%
×4stories
+66ft-88ft

Overall

14110

Females

4294

F40-44

4294

25K→30K

15.5 - 18.6 mi

Top 55%
×9stories
+181ft-148ft

Overall

14704

Females

4752

F40-44

4752

30K→20M

18.6 - 20.0 mi

Top 57%
×5stories
+64ft-50ft

Overall

15139

Females

5078

F40-44

5078

20M→21M

20.0 - 21.0 mi

Top 58%
×8stories
+106ft-24ft

Overall

15571

Females

5385

F40-44

5385

21M→35K

21.0 - 21.8 mi

Top 53%
×7stories
+17ft-86ft

Overall

14189

Females

4669

F40-44

4669

35K→23M

21.8 - 23.0 mi

Top 61%
×5stories
+23ft-63ft

Overall

16320

Females

5920

F40-44

5920

23M→24M

23.0 - 24.0 mi

Top 61%
×6stories
+12ft-82ft

Overall

16110

Females

5860

F40-44

5860

24M→40K

24.0 - 24.9 mi

Top 55%
×1story
+6ft-20ft

Overall

14615

Females

5089

F40-44

5089

40K→25.2M

24.9 - 25.2 mi

Top 49%
×1story
+13ft-16ft

Overall

13081

Females

4279

F40-44

4279

25.2M→Finish

25.2 - 26.2 mi

Top 53%
×2stories
+22ft-21ft

Overall

14086

Females

4790

F40-44

4790

Passing Analysis

Category:
Athletes Passed
2006
Passed By
1150
Net Change
+856
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15626
5K → 10K423194+229#15626#15397
10K → 15K33274+258#15397#15139
15K → 20K28690+196#15139#14943
20K → Half4722+25#14943#14918
Half → 25K20452+152#14918#14766
25K → 30K181152+29#14766#14737
30K → 20M70100-30#14737#14767
20M → 21M7699-23#14767#14790
21M → 35K7232+40#14790#14750
35K → 23M54153-99#14750#14849
23M → 24M5086-36#14849#14885
24M → 40K8237+45#14885#14840
40K → 25.2M529+43#14840#14797
25.2M → Finish7750+27#14797#14770
TOTALS20061150+856
📊

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