Boston Marathon logo
BOSTON MARATHON 2025

Kari Grandstaff

Bib: 17816•F

MI

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Division (F18-39)
#0 / 5469
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:40
Rank: #16115
Start → 5K
24:40 | 7:56/mi
10K· 6.21 mi
49:58
Rank: #16855 (-740)
5K → 10K
25:18 | 8:09/mi
15K· 9.32 mi
1:15:18
Rank: #16925 (-70)
10K → 15K
25:20 | 8:09/mi
20K· 12.43 mi
1:40:54
Rank: #16828 (+97)
15K → 20K
25:36 | 8:14/mi
Half· 13.11 mi
1:46:30
Rank: #16846 (-18)
20K → Half
5:36 | 8:12/mi
25K· 15.53 mi
2:08:36
Rank: #17477 (-631)
Half → 25K
22:06 | 9:07/mi
30K· 18.64 mi
2:38:05
Rank: #17974 (-497)
25K → 30K
29:29 | 9:29/mi
20M
2:51:08
Rank: #18138 (-164)
30K → 20M
13:03 | 9:36/mi
21M
3:02:45
Rank: #18629 (-491)
20M → 21M
11:37 | 11:37/mi
35K· 21.75 mi
3:09:09
Rank: #18528 (+101)
21M → 35K
6:24 | 8:33/mi
23M
3:20:38
Rank: #18414 (+114)
35K → 23M
11:29 | 9:10/mi
24M
3:29:08
Rank: #18234 (+180)
23M → 24M
8:30 | 8:30/mi
40K· 24.85 mi
3:36:46
Rank: #18144 (+90)
24M → 40K
7:38 | 8:56/mi
25.2M
3:39:59
Rank: #18076 (+68)
40K → 25.2M
3:13 | 9:20/mi
Finish· 26.22 mi
3:48:12
Rank: #17893 (+183)
25.2M → Finish
8:13 | 8:04/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
Time1:46:30
Pace8:07 /mi
2nd Half
Distance13.11 mi
Time2:01:42
Pace9:17 /mi
📊Positive Split: 14.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:0724:407:5624:40
7:56
-
10K
6.21 mi11:40:2549:588:0225:18
8:09
+0:13
15K
9.32 mi12:05:451:15:188:0525:20
8:09
0:00
20K
12.43 mi12:31:211:40:548:0725:36
8:14
+0:05
Half
13.11 mi12:36:571:46:308:075:36
8:12
-0:02
25K
15.53 mi12:59:032:08:368:1722:06
9:07
+0:55
30K
18.64 mi13:28:322:38:058:2929:29
9:29
+0:22
20M
20.00 mi13:41:352:51:088:3313:03
9:36
+0:07
21M
21.00 mi13:53:123:02:458:4211:37
11:37
+2:01
35K
21.75 mi13:59:363:09:098:426:24
8:33
-3:04
23M
23.00 mi14:11:053:20:388:4311:29
9:10
+0:37
24M
24.00 mi14:19:353:29:088:438:30
8:30
-0:40
40K
24.85 mi14:27:133:36:468:437:38
8:56
+0:26
25.2M
25.20 mi14:30:263:39:598:443:13
9:20
+0:24
Finish
26.22 mi14:38:393:48:128:438:13
8:04
-1:16

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

7:56 /mi

Average Pace

8:43 /mi

Slowest Pace

11:37 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

32:53

14% of race

Time at Steady Pace

1:44:22

46% of race

Time at Slower Pace

1:30:57

40% of race

Average Pace: 8:42 /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 mi11:15:0724:407:5624:40
7:56
#16115
10K
6.21 mi11:40:2549:588:0225:18
8:09
#16855
15K
9.32 mi12:05:451:15:188:0525:20
8:09
#16925
20K
12.43 mi12:31:211:40:548:0725:36
8:14
#16828
Half
13.11 mi12:36:571:46:308:075:36
8:12
#16846
25K
15.53 mi12:59:032:08:368:1722:06
9:07
#17477
30K
18.64 mi13:28:322:38:058:2929:29
9:29
#17974
20M
20.00 mi13:41:352:51:088:3313:03
9:36
#18138
21M
21.00 mi13:53:123:02:458:4211:37
11:37
#18629
35K
21.75 mi13:59:363:09:098:426:24
8:33
#18528
23M
23.00 mi14:11:053:20:388:4311:29
9:10
#18414
24M
24.00 mi14:19:353:29:088:438:30
8:30
#18234
40K
24.85 mi14:27:133:36:468:437:38
8:56
#18144
25.2M
25.20 mi14:30:263:39:598:443:13
9:20
#18076
Finish
26.22 mi14:38:393:48:128:438:13
8:04
#17893
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi161155217521717119(Top 60%)5805(Top 47%)5805(Top 106%)
10K6.21 mi3.10 mi16855-7405644-4275644-42717506(Top 62%)6001(Top 49%)6001(Top 110%)
15K9.32 mi3.11 mi16925-705678-345678-3417119(Top 60%)5805(Top 47%)5805(Top 106%)
20K12.43 mi3.11 mi16828+975638+405638+4016580(Top 58%)5536(Top 45%)5536(Top 101%)
Half13.11 mi0.68 mi16846-185640-25640-217393(Top 61%)5992(Top 49%)5992(Top 110%)
25K15.53 mi2.42 mi17477-6316047-4076047-40720422(Top 72%)7765(Top 64%)7765(Top 142%)
30K18.64 mi3.11 mi17974-4976388-3416388-34119895(Top 70%)7602(Top 62%)7602(Top 139%)
20M20.00 mi1.36 mi18138-1646495-1076495-10719633(Top 69%)7593(Top 62%)7593(Top 139%)
21M21.00 mi1.00 mi18629-4916790-2956790-29522855(Top 80%)9425(Top 77%)9425(Top 172%)
35K21.75 mi0.75 mi18528+1016750+406750+4015854(Top 56%)5711(Top 47%)5711(Top 104%)
23M23.00 mi1.25 mi18414+1146714+366714+3617213(Top 61%)6566(Top 54%)6566(Top 120%)
24M24.00 mi1.00 mi18234+1806647+676647+6714554(Top 51%)5139(Top 42%)5139(Top 94%)
40K24.85 mi0.85 mi18144+906625+226625+2215930(Top 56%)6010(Top 49%)6010(Top 110%)
25.2M25.20 mi0.35 mi18076+686596+296596+2913723(Top 48%)4903(Top 40%)4903(Top 90%)
Finish26.22 mi1.02 mi17893+1836513+836513+8313366(Top 47%)4645(Top 38%)4645(Top 85%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 60%
×21stories
+97ft-345ft

Overall

17119

Females

5805

F18-39

5805

5K→10K

3.1 - 6.2 mi

Top 62%
×5stories
+79ft-138ft

Overall

17506

Females

6001

F18-39

6001

10K→15K

6.2 - 9.3 mi

Top 60%
×3stories
+67ft-78ft

Overall

17119

Females

5805

F18-39

5805

15K→20K

9.3 - 12.4 mi

Top 58%
×5stories
+106ft-86ft

Overall

16580

Females

5536

F18-39

5536

20K→Half

12.4 - 13.1 mi

Top 61%
×2stories
+19ft-37ft

Overall

17393

Females

5992

F18-39

5992

Half→25K

13.1 - 15.5 mi

Top 72%
×4stories
+66ft-88ft

Overall

20422

Females

7765

F18-39

7765

25K→30K

15.5 - 18.6 mi

Top 70%
×9stories
+181ft-148ft

Overall

19895

Females

7602

F18-39

7602

30K→20M

18.6 - 20.0 mi

Top 69%
×5stories
+64ft-50ft

Overall

19633

Females

7593

F18-39

7593

20M→21M

20.0 - 21.0 mi

Top 80%
×8stories
+106ft-24ft

Overall

22855

Females

9425

F18-39

9425

21M→35K

21.0 - 21.8 mi

Top 56%
×7stories
+17ft-86ft

Overall

15854

Females

5711

F18-39

5711

35K→23M

21.8 - 23.0 mi

Top 61%
×5stories
+23ft-63ft

Overall

17213

Females

6566

F18-39

6566

23M→24M

23.0 - 24.0 mi

Top 51%
×6stories
+12ft-82ft

Overall

14554

Females

5139

F18-39

5139

24M→40K

24.0 - 24.9 mi

Top 56%
×1story
+6ft-20ft

Overall

15930

Females

6010

F18-39

6010

40K→25.2M

24.9 - 25.2 mi

Top 48%
×1story
+13ft-16ft

Overall

13723

Females

4903

F18-39

4903

25.2M→Finish

25.2 - 26.2 mi

Top 47%
×2stories
+22ft-21ft

Overall

13366

Females

4645

F18-39

4645

Passing Analysis

Category:
Athletes Passed
1625
Passed By
3403
Net Change
-1778
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16115
5K → 10K95835-740#16115#16855
10K → 15K184254-70#16855#16925
15K → 20K236139+97#16925#16828
20K → Half3048-18#16828#16846
Half → 25K48679-631#16846#17477
25K → 30K101598-497#17477#17974
30K → 20M78242-164#17974#18138
20M → 21M20511-491#18138#18629
21M → 35K1087+101#18629#18528
35K → 23M16248+114#18528#18414
23M → 24M1833+180#18414#18234
24M → 40K11424+90#18234#18144
40K → 25.2M724+68#18144#18076
25.2M → Finish19411+183#18076#17893
TOTALS16253403-1778
📊

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