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BOSTON MARATHON 2025

Katherine Nielsen

Bib: 16245•F

CA

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 37%
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
21:32
Rank: #7313
Start → 5K
21:32 | 6:56/mi
10K· 6.21 mi
43:48
Rank: #8256 (-943)
5K → 10K
22:16 | 7:10/mi
15K· 9.32 mi
1:06:57
Rank: #9194 (-938)
10K → 15K
23:09 | 7:27/mi
20K· 12.43 mi
1:31:18
Rank: #10282 (-1088)
15K → 20K
24:21 | 7:50/mi
Half· 13.11 mi
1:36:35
Rank: #10470 (-188)
20K → Half
5:17 | 7:45/mi
25K· 15.53 mi
1:56:41
Rank: #11440 (-970)
Half → 25K
20:06 | 8:17/mi
30K· 18.64 mi
2:23:18
Rank: #12154 (-714)
25K → 30K
26:37 | 8:34/mi
20M
2:35:16
Rank: #12432 (-278)
30K → 20M
11:58 | 8:48/mi
21M
2:45:03
Rank: #12786 (-354)
20M → 21M
9:47 | 9:47/mi
35K· 21.75 mi
2:51:39
Rank: #12971 (-185)
21M → 35K
6:36 | 8:49/mi
23M
3:03:58
Rank: #13507 (-536)
35K → 23M
12:19 | 9:50/mi
24M
3:13:26
Rank: #13887 (-380)
23M → 24M
9:28 | 9:28/mi
40K· 24.85 mi
3:21:28
Rank: #14092 (-205)
24M → 40K
8:02 | 9:24/mi
25.2M
3:24:58
Rank: #14154 (-62)
40K → 25.2M
3:30 | 10:09/mi
Finish· 26.22 mi
3:34:04
Rank: #14313 (-159)
25.2M → Finish
9:06 | 8:56/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:36:35
Pace7:22 /mi
2nd Half
Distance13.11 mi
Time1:57:29
Pace8:58 /mi
📊Positive Split: 21.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:54:5621:326:5621:32
6:56
-
10K
6.21 mi11:17:1243:487:0322:16
7:10
+0:14
15K
9.32 mi11:40:211:06:577:1123:09
7:27
+0:17
20K
12.43 mi12:04:421:31:187:2124:21
7:50
+0:23
Half
13.11 mi12:09:591:36:357:225:17
7:45
-0:05
25K
15.53 mi12:30:051:56:417:3120:06
8:17
+0:32
30K
18.64 mi12:56:422:23:187:4126:37
8:34
+0:17
20M
20.00 mi13:08:402:35:167:4611:58
8:48
+0:14
21M
21.00 mi13:18:272:45:037:529:47
9:47
+0:59
35K
21.75 mi13:25:032:51:397:546:36
8:49
-0:58
23M
23.00 mi13:37:223:03:588:0012:19
9:50
+1:01
24M
24.00 mi13:46:503:13:268:049:28
9:28
-0:22
40K
24.85 mi13:54:523:21:288:068:02
9:24
-0:04
25.2M
25.20 mi13:58:223:24:588:083:30
10:09
+0:45
Finish
26.22 mi14:07:283:34:048:109:06
8:56
-1:13

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

6:56 /mi

Average Pace

8:10 /mi

Slowest Pace

10:09 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:56:41

55% of race

Time at Steady Pace

54:17

25% of race

Time at Slower Pace

43:06

20% of race

Average Pace: 8:10 /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 mi10:54:5621:326:5621:32
6:56
#7313
10K
6.21 mi11:17:1243:487:0322:16
7:10
#8256
15K
9.32 mi11:40:211:06:577:1123:09
7:27
#9194
20K
12.43 mi12:04:421:31:187:2124:21
7:50
#10282
Half
13.11 mi12:09:591:36:357:225:17
7:45
#10470
25K
15.53 mi12:30:051:56:417:3120:06
8:17
#11440
30K
18.64 mi12:56:422:23:187:4126:37
8:34
#12154
20M
20.00 mi13:08:402:35:167:4611:58
8:48
#12432
21M
21.00 mi13:18:272:45:037:529:47
9:47
#12786
35K
21.75 mi13:25:032:51:397:546:36
8:49
#12971
23M
23.00 mi13:37:223:03:588:0012:19
9:50
#13507
24M
24.00 mi13:46:503:13:268:049:28
9:28
#13887
40K
24.85 mi13:54:523:21:288:068:02
9:24
#14092
25.2M
25.20 mi13:58:223:24:588:083:30
10:09
#14154
Finish
26.22 mi14:07:283:34:048:109:06
8:56
#14313
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi731377477411362(Top 40%)2564(Top 21%)2564(Top 47%)
10K6.21 mi3.10 mi8256-9431093-3191093-3199233(Top 33%)1482(Top 12%)1482(Top 27%)
15K9.32 mi3.11 mi9194-9381478-3851478-38511362(Top 40%)2564(Top 21%)2564(Top 47%)
20K12.43 mi3.11 mi10282-10882005-5272005-52713590(Top 48%)3872(Top 32%)3872(Top 71%)
Half13.11 mi0.68 mi10470-1882088-832088-8313859(Top 49%)3998(Top 33%)3998(Top 73%)
25K15.53 mi2.42 mi11440-9702618-5302618-53015858(Top 56%)5229(Top 43%)5229(Top 96%)
30K18.64 mi3.11 mi12154-7143075-4573075-45715188(Top 53%)5007(Top 41%)5007(Top 92%)
20M20.00 mi1.36 mi12432-2783268-1933268-19315700(Top 55%)5413(Top 44%)5413(Top 99%)
21M21.00 mi1.00 mi12786-3543494-2263494-22617403(Top 61%)6473(Top 53%)6473(Top 118%)
35K21.75 mi0.75 mi12971-1853606-1123606-11217370(Top 61%)6557(Top 54%)6557(Top 120%)
23M23.00 mi1.25 mi13507-5363959-3533959-35319928(Top 70%)8008(Top 65%)8008(Top 146%)
24M24.00 mi1.00 mi13887-3804194-2354194-23519507(Top 69%)7821(Top 64%)7821(Top 143%)
40K24.85 mi0.85 mi14092-2054328-1344328-13418269(Top 64%)7247(Top 59%)7247(Top 133%)
25.2M25.20 mi0.35 mi14154-624373-454373-4517692(Top 62%)6944(Top 57%)6944(Top 127%)
Finish26.22 mi1.02 mi14313-1594487-1144487-11418678(Top 66%)7413(Top 61%)7413(Top 136%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 40%
×21stories
+97ft-345ft

Overall

11362

Females

2564

F18-39

2564

5K→10K

3.1 - 6.2 mi

Top 33%
×5stories
+79ft-138ft

Overall

9233

Females

1482

F18-39

1482

10K→15K

6.2 - 9.3 mi

Top 40%
×3stories
+67ft-78ft

Overall

11362

Females

2564

F18-39

2564

15K→20K

9.3 - 12.4 mi

Top 48%
×5stories
+106ft-86ft

Overall

13590

Females

3872

F18-39

3872

20K→Half

12.4 - 13.1 mi

Top 49%
×2stories
+19ft-37ft

Overall

13859

Females

3998

F18-39

3998

Half→25K

13.1 - 15.5 mi

Top 56%
×4stories
+66ft-88ft

Overall

15858

Females

5229

F18-39

5229

25K→30K

15.5 - 18.6 mi

Top 53%
×9stories
+181ft-148ft

Overall

15188

Females

5007

F18-39

5007

30K→20M

18.6 - 20.0 mi

Top 55%
×5stories
+64ft-50ft

Overall

15700

Females

5413

F18-39

5413

20M→21M

20.0 - 21.0 mi

Top 61%
×8stories
+106ft-24ft

Overall

17403

Females

6473

F18-39

6473

21M→35K

21.0 - 21.8 mi

Top 61%
×7stories
+17ft-86ft

Overall

17370

Females

6557

F18-39

6557

35K→23M

21.8 - 23.0 mi

Top 70%
×5stories
+23ft-63ft

Overall

19928

Females

8008

F18-39

8008

23M→24M

23.0 - 24.0 mi

Top 69%
×6stories
+12ft-82ft

Overall

19507

Females

7821

F18-39

7821

24M→40K

24.0 - 24.9 mi

Top 64%
×1story
+6ft-20ft

Overall

18269

Females

7247

F18-39

7247

40K→25.2M

24.9 - 25.2 mi

Top 62%
×1story
+13ft-16ft

Overall

17692

Females

6944

F18-39

6944

25.2M→Finish

25.2 - 26.2 mi

Top 66%
×2stories
+22ft-21ft

Overall

18678

Females

7413

F18-39

7413

Passing Analysis

Category:
Athletes Passed
468
Passed By
7466
Net Change
-7000
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#7313
5K → 10K26969-943#7313#8256
10K → 15K26964-938#8256#9194
15K → 20K281114-1088#9194#10282
20K → Half9197-188#10282#10470
Half → 25K29999-970#10470#11440
25K → 30K96810-714#11440#12154
30K → 20M60338-278#12154#12432
20M → 21M31385-354#12432#12786
21M → 35K25210-185#12786#12971
35K → 23M26562-536#12971#13507
23M → 24M25405-380#13507#13887
24M → 40K34239-205#13887#14092
40K → 25.2M1779-62#14092#14154
25.2M → Finish36195-159#14154#14313
TOTALS4687466-7000
📊

Passing Visuals

Category:
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🔥Passing Intensity

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing