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BOSTON MARATHON 2025

Katherine Nielson

TX

Bib: 8493 F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 47%
Gender (Female)
#0 / 12228
Top 32%
Masters (Masters Women)
#0 / 6759
Top 17%
Division (F55-59)
#0 / 994
Top 5%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:57/mi
24:43
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:58/mi
49:28
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:55/mi
1:14:04
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:53/mi
1:38:33
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:42/mi
1:43:48
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:00/mi
2:03:11
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:07/mi
2:28:25
↑ 181↓ 1480.2%
138 ft elev
20M
8:11/mi
2:39:32
↑ 64↓ 500.2%
148 ft elev
21M
8:41/mi
2:48:13
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:07/mi
2:54:17
↑ 17↓ 861.7%
156 ft elev
23M
7:57/mi
3:04:14
↑ 23↓ 630.6%
116 ft elev
24M
8:01/mi
3:12:15
↓ 821.3%
34 ft elev
40K· 24.85 mi
7:58/mi
3:19:04
↓ 200.3%
20 ft elev
25.2M
9:02/mi
3:22:11
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:07/mi
3:30:27
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:43:487:55 /mi⚡ faster
2nd Half
1:46:398:08 /mi+2.7%
Positive split — 2.7% slower in the second half
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Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:32:2924:437:5724:43
7:57
-
10K
6.21 mi10:57:1449:287:5824:45
7:58
+0:01
15K
9.32 mi11:21:501:14:047:5724:36
7:55
-0:03
20K
12.43 mi11:46:191:38:337:5624:29
7:53
-0:02
Half
13.11 mi11:51:341:43:487:555:15
7:42
-0:11
25K
15.53 mi12:10:572:03:117:5619:23
8:00
+0:18
30K
18.64 mi12:36:112:28:257:5825:14
8:07
+0:07
20M
20.00 mi12:47:182:39:327:5911:07
8:11
+0:04
21M
21.00 mi12:55:592:48:138:018:41
8:41
+0:30
35K
21.75 mi13:02:032:54:178:016:04
8:07
-0:34
23M
23.00 mi13:12:003:04:148:019:57
7:57
-0:10
24M
24.00 mi13:20:013:12:158:018:01
8:01
+0:04
40K
24.85 mi13:26:503:19:048:016:49
7:58
-0:03
25.2M
25.20 mi13:29:573:22:118:013:07
9:02
+1:04
Finish
26.22 mi13:38:133:30:278:028:16
8:07
-0:55

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

7:42 /mi

Average Pace

8:02 /mi

Slowest Pace

9:02 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:18:39

94% of race

Time at Steady Pace

11:48

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:02 /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 mi10:32:2924:437:5724:43
7:57
#16248
10K
6.21 mi10:57:1449:287:5824:45
7:58
#16186
15K
9.32 mi11:21:501:14:047:5724:36
7:55
#15889
20K
12.43 mi11:46:191:38:337:5624:29
7:53
#15373
Half
13.11 mi11:51:341:43:487:555:15
7:42
#15253
25K
15.53 mi12:10:572:03:117:5619:23
8:00
#14989
30K
18.64 mi12:36:112:28:257:5825:14
8:07
#14381
20M
20.00 mi12:47:182:39:327:5911:07
8:11
#14132
21M
21.00 mi12:55:592:48:138:018:41
8:41
#13937
35K
21.75 mi13:02:032:54:178:016:04
8:07
#13874
23M
23.00 mi13:12:003:04:148:019:57
7:57
#13596
24M
24.00 mi13:20:013:12:158:018:01
8:01
#13474
40K
24.85 mi13:26:503:19:048:016:49
7:58
#13320
25.2M
25.20 mi13:29:573:22:118:013:07
9:02
#13297
Finish
26.22 mi13:38:133:30:278:028:16
8:07
#13328
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF55-59Seg. OverallSeg. FemalesSeg. F55-59
5K3.11 mi3.11 mi16248529352931537847944794
10K6.21 mi3.10 mi16186+625255+385255+381619952395239
15K9.32 mi3.11 mi15889+2975075+1805075+1801537847944794
20K12.43 mi3.11 mi15373+5164790+2854790+2851393640564056
Half13.11 mi0.68 mi15253+1204724+664724+661342437353735
25K15.53 mi2.42 mi14989+2644606+1184606+1181385541354135
30K18.64 mi3.11 mi14381+6084324+2824324+2821226534273427
20M20.00 mi1.36 mi14132+2494208+1164208+1161171533133313
21M21.00 mi1.00 mi13937+1954134+744134+741160934073407
35K21.75 mi0.75 mi13874+634118+164118+161301941674167
23M23.00 mi1.25 mi13596+2784009+1094009+109968126002600
24M24.00 mi1.00 mi13474+1223961+483961+481139735203520
40K24.85 mi0.85 mi13320+1543906+553906+551005329652965
25.2M25.20 mi0.35 mi13297+233908-23908-21207040114011
Finish26.22 mi1.02 mi13328-313939-313939-311369347914791

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 54%
×21story building
+97ft-345ft

Overall

15378

Females

4794

F55-59

4794

5K→10K

3.1 - 6.2 mi

Top 57%
×5story building
+79ft-138ft

Overall

16199

Females

5239

F55-59

5239

10K→15K

6.2 - 9.3 mi

Top 54%
×3story building
+67ft-78ft

Overall

15378

Females

4794

F55-59

4794

15K→20K

9.3 - 12.4 mi

Top 49%
×5story building
+106ft-86ft

Overall

13936

Females

4056

F55-59

4056

20K→Half

12.4 - 13.1 mi

Top 47%
×2story building
+19ft-37ft

Overall

13424

Females

3735

F55-59

3735

Half→25K

13.1 - 15.5 mi

Top 49%
×4story building
+66ft-88ft

Overall

13855

Females

4135

F55-59

4135

25K→30K

15.5 - 18.6 mi

Top 43%
×9story building
+181ft-148ft

Overall

12265

Females

3427

F55-59

3427

30K→20M

18.6 - 20.0 mi

Top 41%
×5story building
+64ft-50ft

Overall

11715

Females

3313

F55-59

3313

20M→21M

20.0 - 21.0 mi

Top 41%
×8story building
+106ft-24ft

Overall

11609

Females

3407

F55-59

3407

21M→35K

21.0 - 21.8 mi

Top 46%
×7story building
+17ft-86ft

Overall

13019

Females

4167

F55-59

4167

35K→23M

21.8 - 23.0 mi

Top 34%
×5story building
+23ft-63ft

Overall

9681

Females

2600

F55-59

2600

23M→24M

23.0 - 24.0 mi

Top 40%
×6story building
+12ft-82ft

Overall

11397

Females

3520

F55-59

3520

24M→40K

24.0 - 24.9 mi

Top 35%
×1story
+6ft-20ft

Overall

10053

Females

2965

F55-59

2965

40K→25.2M

24.9 - 25.2 mi

Top 42%
×1story
+13ft-16ft

Overall

12070

Females

4011

F55-59

4011

25.2M→Finish

25.2 - 26.2 mi

Top 48%
×2story building
+22ft-21ft

Overall

13693

Females

4791

F55-59

4791

Passing Analysis

Category:
Athletes Passed
3566
Passed By
646
Net Change
+2920
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16248
5K → 10K326264+62#16248#16186
10K → 15K37679+297#16186#15889
15K → 20K54024+516#15889#15373
20K → Half1211+120#15373#15253
Half → 25K31551+264#15253#14989
25K → 30K62820+608#14989#14381
30K → 20M26516+249#14381#14132
20M → 21M21823+195#14132#13937
21M → 35K9128+63#13937#13874
35K → 23M2857+278#13874#13596
23M → 24M14725+122#13596#13474
24M → 40K1639+154#13474#13320
40K → 25.2M4522+23#13320#13297
25.2M → Finish4677-31#13297#13328
TOTALS3566646+2920

Passing Charts

Category:
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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