Boston Marathon logo
BOSTON MARATHON 2025

Natalie Kartchner

Bib: 16338•F

AZ

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 43%
Gender (Female)
#0 / 12228
Top 27%
Division (F18-39)
#0 / 5469
Top 45%
Race Day Weather
50°/40°F
broken clouds

⏱️ 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
8:02/mi
24:57
↑ 97↓ 3451.5%
10K· 6.21 mi
7:44/mi
49:00
↑ 79↓ 1380.4%
15K· 9.32 mi
7:49/mi
1:13:16
↑ 67↓ 78
20K· 12.43 mi
7:53/mi
1:37:44
↑ 106↓ 860.1%
Half· 13.11 mi
7:52/mi
1:43:06
↑ 19↓ 370.5%
25K· 15.53 mi
7:50/mi
2:02:05
↑ 66↓ 880.2%
30K· 18.64 mi
7:59/mi
2:26:53
↑ 181↓ 1480.2%
20M
7:52/mi
2:37:34
↑ 64↓ 500.2%
21M
8:19/mi
2:45:53
↑ 106↓ 241.6%
35K· 21.75 mi
7:42/mi
2:51:39
↑ 17↓ 861.7%
23M
7:44/mi
3:01:20
↑ 23↓ 630.6%
24M
7:37/mi
3:08:57
↓ 821.3%
40K· 24.85 mi
7:57/mi
3:15:45
↓ 200.3%
25.2M
8:45/mi
3:18:46
↑ 13↓ 160.2%
Finish· 26.22 mi
7:40/mi
3:26:35
↑ 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 Half⚖️ Balanced
Distance13.11 mi
Time1:43:06
Pace7:52 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:43:29
Pace7:54 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:59:3124:578:0224:57
8:02
-
10K
6.21 mi11:23:3449:007:5324:03
7:44
-0:18
15K
9.32 mi11:47:501:13:167:5224:16
7:49
+0:05
20K
12.43 mi12:12:181:37:447:5224:28
7:53
+0:04
Half
13.11 mi12:17:401:43:067:525:22
7:52
-0:01
25K
15.53 mi12:36:392:02:057:5218:59
7:50
-0:02
30K
18.64 mi13:01:272:26:537:5324:48
7:59
+0:09
20M
20.00 mi13:12:082:37:347:5310:41
7:52
-0:07
21M
21.00 mi13:20:272:45:537:548:19
8:19
+0:27
35K
21.75 mi13:26:132:51:397:545:46
7:42
-0:37
23M
23.00 mi13:35:543:01:207:539:41
7:44
+0:02
24M
24.00 mi13:43:313:08:577:527:37
7:37
-0:07
40K
24.85 mi13:50:193:15:457:536:48
7:57
+0:20
25.2M
25.20 mi13:53:203:18:467:533:01
8:45
+0:48
Finish
26.22 mi14:01:093:26:357:537:49
7:40
-1:05

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

7:37 /mi

Average Pace

7:53 /mi

Slowest Pace

8:45 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:23:34

99% of race

Time at Steady Pace

3:01

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:53 /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 mi10:59:3124:578:0224:57
8:02
#16833
10K
6.21 mi11:23:3449:007:5324:03
7:44
#15535
15K
9.32 mi11:47:501:13:167:5224:16
7:49
#15172
20K
12.43 mi12:12:181:37:447:5224:28
7:53
#14796
Half
13.11 mi12:17:401:43:067:525:22
7:52
#14776
25K
15.53 mi12:36:392:02:057:5218:59
7:50
#14375
30K
18.64 mi13:01:272:26:537:5324:48
7:59
#13709
20M
20.00 mi13:12:082:37:347:5310:41
7:52
#13359
21M
21.00 mi13:20:272:45:537:548:19
8:19
#13084
35K
21.75 mi13:26:132:51:397:545:46
7:42
#12968
23M
23.00 mi13:35:543:01:207:539:41
7:44
#12641
24M
24.00 mi13:43:313:08:577:527:37
7:37
#12427
40K
24.85 mi13:50:193:15:457:536:48
7:57
#12301
25.2M
25.20 mi13:53:203:18:467:533:01
8:45
#12254
Finish
26.22 mi14:01:093:26:357:537:49
7:40
#12160
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi168335642564214466(Top 51%)4286(Top 35%)4286(Top 78%)
10K6.21 mi3.10 mi15535+12984857+7854857+78514266(Top 50%)4112(Top 34%)4112(Top 75%)
15K9.32 mi3.11 mi15172+3634662+1954662+19514466(Top 51%)4286(Top 35%)4286(Top 78%)
20K12.43 mi3.11 mi14796+3764469+1934469+19313885(Top 49%)4022(Top 33%)4022(Top 74%)
Half13.11 mi0.68 mi14776+204455+144455+1414807(Top 52%)4485(Top 37%)4485(Top 82%)
25K15.53 mi2.42 mi14375+4014259+1964259+19612597(Top 44%)3451(Top 28%)3451(Top 63%)
30K18.64 mi3.11 mi13709+6663941+3183941+31811261(Top 40%)2916(Top 24%)2916(Top 53%)
20M20.00 mi1.36 mi13359+3503777+1643777+1649497(Top 33%)2222(Top 18%)2222(Top 41%)
21M21.00 mi1.00 mi13084+2753650+1273650+1279372(Top 33%)2331(Top 19%)2331(Top 43%)
35K21.75 mi0.75 mi12968+1163603+473603+4710196(Top 36%)2714(Top 22%)2714(Top 50%)
23M23.00 mi1.25 mi12641+3273468+1353468+1358147(Top 29%)1893(Top 15%)1893(Top 35%)
24M24.00 mi1.00 mi12427+2143388+803388+808584(Top 30%)2146(Top 18%)2146(Top 39%)
40K24.85 mi0.85 mi12301+1263354+343354+349899(Top 35%)2879(Top 24%)2879(Top 53%)
25.2M25.20 mi0.35 mi12254+473346+83346+810371(Top 37%)3207(Top 26%)3207(Top 59%)
Finish26.22 mi1.02 mi12160+943330+163330+1610505(Top 37%)3220(Top 26%)3220(Top 59%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 51%
×21story building
+97ft-345ft

Overall

14466

Females

4286

F18-39

4286

5K→10K

3.1 - 6.2 mi

Top 50%
×5story building
+79ft-138ft

Overall

14266

Females

4112

F18-39

4112

10K→15K

6.2 - 9.3 mi

Top 51%
×3story building
+67ft-78ft

Overall

14466

Females

4286

F18-39

4286

15K→20K

9.3 - 12.4 mi

Top 49%
×5story building
+106ft-86ft

Overall

13885

Females

4022

F18-39

4022

20K→Half

12.4 - 13.1 mi

Top 52%
×2story building
+19ft-37ft

Overall

14807

Females

4485

F18-39

4485

Half→25K

13.1 - 15.5 mi

Top 44%
×4story building
+66ft-88ft

Overall

12597

Females

3451

F18-39

3451

25K→30K

15.5 - 18.6 mi

Top 40%
×9story building
+181ft-148ft

Overall

11261

Females

2916

F18-39

2916

30K→20M

18.6 - 20.0 mi

Top 33%
×5story building
+64ft-50ft

Overall

9497

Females

2222

F18-39

2222

20M→21M

20.0 - 21.0 mi

Top 33%
×8story building
+106ft-24ft

Overall

9372

Females

2331

F18-39

2331

21M→35K

21.0 - 21.8 mi

Top 36%
×7story building
+17ft-86ft

Overall

10196

Females

2714

F18-39

2714

35K→23M

21.8 - 23.0 mi

Top 29%
×5story building
+23ft-63ft

Overall

8147

Females

1893

F18-39

1893

23M→24M

23.0 - 24.0 mi

Top 30%
×6story building
+12ft-82ft

Overall

8584

Females

2146

F18-39

2146

24M→40K

24.0 - 24.9 mi

Top 35%
×1story
+6ft-20ft

Overall

9899

Females

2879

F18-39

2879

40K→25.2M

24.9 - 25.2 mi

Top 37%
×1story
+13ft-16ft

Overall

10371

Females

3207

F18-39

3207

25.2M→Finish

25.2 - 26.2 mi

Top 37%
×2story building
+22ft-21ft

Overall

10505

Females

3220

F18-39

3220

Passing Analysis

Category:
Athletes Passed
4914
Passed By
241
Net Change
+4673
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16833
5K → 10K132426+1298#16833#15535
10K → 15K41451+363#15535#15172
15K → 20K41842+376#15172#14796
20K → Half4020+20#14796#14776
Half → 25K41716+401#14776#14375
25K → 30K67711+666#14375#13709
30K → 20M3555+350#13709#13359
20M → 21M2838+275#13359#13084
21M → 35K1215+116#13084#12968
35K → 23M3303+327#12968#12641
23M → 24M2173+214#12641#12427
24M → 40K14317+126#12427#12301
40K → 25.2M569+47#12301#12254
25.2M → Finish11925+94#12254#12160
TOTALS4914241+4673
📊

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