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BOSTON MARATHON 2025

Nicola Critchlow

Bib: 21798•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 42%
Masters (Masters Women)
#0 / 6759
Top 28%
Division (F50-54)
#0 / 1303
Top 19%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:22
Rank: #17861
Start → 5K
25:22 | 8:10/mi
10K· 6.21 mi
50:30
Rank: #17465 (+396)
5K → 10K
25:08 | 8:05/mi
15K· 9.32 mi
1:15:42
Rank: #17243 (+222)
10K → 15K
25:12 | 8:07/mi
20K· 12.43 mi
1:41:03
Rank: #16908 (+335)
15K → 20K
25:21 | 8:10/mi
Half· 13.11 mi
1:46:33
Rank: #16878 (+30)
20K → Half
5:30 | 8:04/mi
25K· 15.53 mi
2:06:20
Rank: #16530 (+348)
Half → 25K
19:47 | 8:10/mi
30K· 18.64 mi
2:32:30
Rank: #16097 (+433)
25K → 30K
26:10 | 8:25/mi
20M
2:43:59
Rank: #15860 (+237)
30K → 20M
11:29 | 8:27/mi
21M
2:52:51
Rank: #15625 (+235)
20M → 21M
8:52 | 8:52/mi
35K· 21.75 mi
2:59:04
Rank: #15560 (+65)
21M → 35K
6:13 | 8:19/mi
23M
3:09:53
Rank: #15429 (+131)
35K → 23M
10:49 | 8:38/mi
24M
3:18:30
Rank: #15398 (+31)
23M → 24M
8:37 | 8:37/mi
40K· 24.85 mi
3:25:53
Rank: #15336 (+62)
24M → 40K
7:23 | 8:38/mi
25.2M
3:29:11
Rank: #15326 (+10)
40K → 25.2M
3:18 | 9:34/mi
Finish· 26.22 mi
3:37:53
Rank: #15355 (-29)
25.2M → Finish
8:42 | 8:32/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:46:33
Pace8:08 /mi
2nd Half
Distance13.11 mi
Time1:51:20
Pace8:30 /mi
📊Positive Split: 4.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:20:4525:228:1025:22
8:10
-
10K
6.21 mi11:45:5350:308:0825:08
8:05
-0:05
15K
9.32 mi12:11:051:15:428:0725:12
8:07
+0:02
20K
12.43 mi12:36:261:41:038:0825:21
8:10
+0:03
Half
13.11 mi12:41:561:46:338:085:30
8:04
-0:06
25K
15.53 mi13:01:432:06:208:0819:47
8:10
+0:06
30K
18.64 mi13:27:532:32:308:1126:10
8:25
+0:15
20M
20.00 mi13:39:222:43:598:1211:29
8:27
+0:02
21M
21.00 mi13:48:142:52:518:148:52
8:52
+0:25
35K
21.75 mi13:54:272:59:048:146:13
8:19
-0:33
23M
23.00 mi14:05:163:09:538:1510:49
8:38
+0:19
24M
24.00 mi14:13:533:18:308:168:37
8:37
-0:01
40K
24.85 mi14:21:163:25:538:177:23
8:38
+0:01
25.2M
25.20 mi14:24:343:29:118:183:18
9:34
+0:56
Finish
26.22 mi14:33:163:37:538:198:42
8:32
-1:02

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

8:04 /mi

Average Pace

8:19 /mi

Slowest Pace

9:34 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:34:35

98% of race

Time at Steady Pace

0:00

0% of race

Time at Slower Pace

3:18

2% of race

Average Pace: 8:19 /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 mi11:20:4525:228:1025:22
8:10
#17861
10K
6.21 mi11:45:5350:308:0825:08
8:05
#17465
15K
9.32 mi12:11:051:15:428:0725:12
8:07
#17243
20K
12.43 mi12:36:261:41:038:0825:21
8:10
#16908
Half
13.11 mi12:41:561:46:338:085:30
8:04
#16878
25K
15.53 mi13:01:432:06:208:0819:47
8:10
#16530
30K
18.64 mi13:27:532:32:308:1126:10
8:25
#16097
20M
20.00 mi13:39:222:43:598:1211:29
8:27
#15860
21M
21.00 mi13:48:142:52:518:148:52
8:52
#15625
35K
21.75 mi13:54:272:59:048:146:13
8:19
#15560
23M
23.00 mi14:05:163:09:538:1510:49
8:38
#15429
24M
24.00 mi14:13:533:18:308:168:37
8:37
#15398
40K
24.85 mi14:21:163:25:538:177:23
8:38
#15336
25.2M
25.20 mi14:24:343:29:118:183:18
9:34
#15326
Finish
26.22 mi14:33:163:37:538:198:42
8:32
#15355
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi178616255625516816(Top 59%)5619(Top 46%)5619(Top 431%)
10K6.21 mi3.10 mi17465+3966016+2396016+23917126(Top 60%)5772(Top 47%)5772(Top 443%)
15K9.32 mi3.11 mi17243+2225858+1585858+15816816(Top 59%)5619(Top 46%)5619(Top 431%)
20K12.43 mi3.11 mi16908+3355684+1745684+17416057(Top 57%)5250(Top 43%)5250(Top 403%)
Half13.11 mi0.68 mi16878+305665+195665+1916405(Top 58%)5410(Top 44%)5410(Top 415%)
25K15.53 mi2.42 mi16530+3485477+1885477+18815059(Top 53%)4766(Top 39%)4766(Top 366%)
30K18.64 mi3.11 mi16097+4335283+1945283+19414286(Top 50%)4528(Top 37%)4528(Top 348%)
20M20.00 mi1.36 mi15860+2375190+935190+9313500(Top 48%)4251(Top 35%)4251(Top 326%)
21M21.00 mi1.00 mi15625+2355089+1015089+10112758(Top 45%)4019(Top 33%)4019(Top 308%)
35K21.75 mi0.75 mi15560+655070+195070+1914350(Top 51%)4881(Top 40%)4881(Top 375%)
23M23.00 mi1.25 mi15429+1315033+375033+3714201(Top 50%)4904(Top 40%)4904(Top 376%)
24M24.00 mi1.00 mi15398+315039-65039-615277(Top 54%)5527(Top 45%)5527(Top 424%)
40K24.85 mi0.85 mi15336+625037+25037+214300(Top 50%)5129(Top 42%)5129(Top 394%)
25.2M25.20 mi0.35 mi15326+105041-45041-414989(Top 53%)5536(Top 45%)5536(Top 425%)
Finish26.22 mi1.02 mi15355-295078-375078-3716473(Top 58%)6283(Top 51%)6283(Top 482%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 59%
×21stories
+97ft-345ft

Overall

16816

Females

5619

F50-54

5619

5K→10K

3.1 - 6.2 mi

Top 60%
×5stories
+79ft-138ft

Overall

17126

Females

5772

F50-54

5772

10K→15K

6.2 - 9.3 mi

Top 59%
×3stories
+67ft-78ft

Overall

16816

Females

5619

F50-54

5619

15K→20K

9.3 - 12.4 mi

Top 57%
×5stories
+106ft-86ft

Overall

16057

Females

5250

F50-54

5250

20K→Half

12.4 - 13.1 mi

Top 58%
×2stories
+19ft-37ft

Overall

16405

Females

5410

F50-54

5410

Half→25K

13.1 - 15.5 mi

Top 53%
×4stories
+66ft-88ft

Overall

15059

Females

4766

F50-54

4766

25K→30K

15.5 - 18.6 mi

Top 50%
×9stories
+181ft-148ft

Overall

14286

Females

4528

F50-54

4528

30K→20M

18.6 - 20.0 mi

Top 48%
×5stories
+64ft-50ft

Overall

13500

Females

4251

F50-54

4251

20M→21M

20.0 - 21.0 mi

Top 45%
×8stories
+106ft-24ft

Overall

12758

Females

4019

F50-54

4019

21M→35K

21.0 - 21.8 mi

Top 51%
×7stories
+17ft-86ft

Overall

14350

Females

4881

F50-54

4881

35K→23M

21.8 - 23.0 mi

Top 50%
×5stories
+23ft-63ft

Overall

14201

Females

4904

F50-54

4904

23M→24M

23.0 - 24.0 mi

Top 54%
×6stories
+12ft-82ft

Overall

15277

Females

5527

F50-54

5527

24M→40K

24.0 - 24.9 mi

Top 50%
×1story
+6ft-20ft

Overall

14300

Females

5129

F50-54

5129

40K→25.2M

24.9 - 25.2 mi

Top 53%
×1story
+13ft-16ft

Overall

14989

Females

5536

F50-54

5536

25.2M→Finish

25.2 - 26.2 mi

Top 58%
×2stories
+22ft-21ft

Overall

16473

Females

6283

F50-54

6283

Passing Analysis

Category:
Athletes Passed
3157
Passed By
651
Net Change
+2506
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17861
5K → 10K525129+396#17861#17465
10K → 15K326104+222#17465#17243
15K → 20K37641+335#17243#16908
20K → Half4919+30#16908#16878
Half → 25K36719+348#16878#16530
25K → 30K47542+433#16530#16097
30K → 20M25518+237#16097#15860
20M → 21M25419+235#15860#15625
21M → 35K9126+65#15625#15560
35K → 23M17241+131#15560#15429
23M → 24M8554+31#15429#15398
24M → 40K10240+62#15398#15336
40K → 25.2M3323+10#15336#15326
25.2M → Finish4776-29#15326#15355
TOTALS3157651+2506
📊

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