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BOSTON MARATHON 2025

Rebecca Blacklock

Bib: 15081•F

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 50%
Gender (Female)
#0 / 12228
Top 36%
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
23:12
Rank: #11979
Start → 5K
7:28/mi
23:12 split
10K· 6.21 mi
46:50
Rank: #12468 (-489)
5K → 10K
7:36/mi
23:38 split
15K· 9.32 mi
1:10:44
Rank: #12775 (-307)
10K → 15K
7:42/mi
23:54 split
20K· 12.43 mi
1:35:01
Rank: #12895 (-120)
15K → 20K
7:49/mi
24:17 split
Half· 13.11 mi
1:40:16
Rank: #12899 (-4)
20K → Half
7:42/mi
5:15 split
25K· 15.53 mi
1:59:41
Rank: #13062 (-163)
Half → 25K
8:00/mi
19:25 split
30K· 18.64 mi
2:26:07
Rank: #13402 (-340)
25K → 30K
8:30/mi
26:26 split
20M
2:38:01
Rank: #13531 (-129)
30K → 20M
8:45/mi
11:54 split
21M
2:47:14
Rank: #13584 (-53)
20M → 21M
9:13/mi
9:13 split
35K· 21.75 mi
2:53:40
Rank: #13669 (-85)
21M → 35K
8:36/mi
6:26 split
23M
3:04:52
Rank: #13824 (-155)
35K → 23M
8:57/mi
11:12 split
24M
3:13:47
Rank: #14015 (-191)
23M → 24M
8:55/mi
8:55 split
40K· 24.85 mi
3:21:26
Rank: #14080 (-65)
24M → 40K
8:57/mi
7:39 split
25.2M
3:24:47
Rank: #14103 (-23)
40K → 25.2M
9:43/mi
3:21 split
Finish· 26.22 mi
3:33:25
Rank: #14144 (-41)
25.2M → Finish
8:28/mi
8:38 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:40:16
Pace7:39 /mi
2nd Half
Distance13.11 mi
Time1:53:09
Pace8:38 /mi
📊Positive Split: 12.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:56:4523:127:2823:12
7:28
-
10K
6.21 mi11:20:2346:507:3223:38
7:36
+0:08
15K
9.32 mi11:44:171:10:447:3523:54
7:42
+0:06
20K
12.43 mi12:08:341:35:017:3924:17
7:49
+0:07
Half
13.11 mi12:13:491:40:167:395:15
7:42
-0:07
25K
15.53 mi12:33:141:59:417:4219:25
8:00
+0:18
30K
18.64 mi12:59:402:26:077:5026:26
8:30
+0:30
20M
20.00 mi13:11:342:38:017:5411:54
8:45
+0:15
21M
21.00 mi13:20:472:47:147:589:13
9:13
+0:28
35K
21.75 mi13:27:132:53:407:596:26
8:36
-0:37
23M
23.00 mi13:38:253:04:528:0211:12
8:57
+0:21
24M
24.00 mi13:47:203:13:478:048:55
8:55
-0:02
40K
24.85 mi13:54:593:21:268:067:39
8:57
+0:02
25.2M
25.20 mi13:58:203:24:478:083:21
9:43
+0:46
Finish
26.22 mi14:06:583:33:258:098:38
8:28
-1:15

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

7:28 /mi

Average Pace

8:09 /mi

Slowest Pace

9:43 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:59:41

56% of race

Time at Steady Pace

53:24

25% of race

Time at Slower Pace

40:20

19% of race

Average Pace: 8:08 /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 mi10:56:4523:127:2823:12
7:28
#11979
10K
6.21 mi11:20:2346:507:3223:38
7:36
#12468
15K
9.32 mi11:44:171:10:447:3523:54
7:42
#12775
20K
12.43 mi12:08:341:35:017:3924:17
7:49
#12895
Half
13.11 mi12:13:491:40:167:395:15
7:42
#12899
25K
15.53 mi12:33:141:59:417:4219:25
8:00
#13062
30K
18.64 mi12:59:402:26:077:5026:26
8:30
#13402
20M
20.00 mi13:11:342:38:017:5411:54
8:45
#13531
21M
21.00 mi13:20:472:47:147:589:13
9:13
#13584
35K
21.75 mi13:27:132:53:407:596:26
8:36
#13669
23M
23.00 mi13:38:253:04:528:0211:12
8:57
#13824
24M
24.00 mi13:47:203:13:478:048:55
8:55
#14015
40K
24.85 mi13:54:593:21:268:067:39
8:57
#14080
25.2M
25.20 mi13:58:203:24:478:083:21
9:43
#14103
Finish
26.22 mi14:06:583:33:258:098:38
8:28
#14144
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi119792792279213452(Top 47%)3714(Top 30%)3714(Top 68%)
10K6.21 mi3.10 mi12468-4893051-2593051-25913114(Top 46%)3444(Top 28%)3444(Top 63%)
15K9.32 mi3.11 mi12775-3073256-2053256-20513452(Top 47%)3714(Top 30%)3714(Top 68%)
20K12.43 mi3.11 mi12895-1203387-1313387-13113421(Top 47%)3773(Top 31%)3773(Top 69%)
Half13.11 mi0.68 mi12899-43393-63393-613442(Top 47%)3753(Top 31%)3753(Top 69%)
25K15.53 mi2.42 mi13062-1633510-1173510-11713974(Top 49%)4196(Top 34%)4196(Top 77%)
30K18.64 mi3.11 mi13402-3403771-2613771-26114810(Top 52%)4801(Top 39%)4801(Top 88%)
20M20.00 mi1.36 mi13531-1293869-983869-9815426(Top 54%)5276(Top 43%)5276(Top 96%)
21M21.00 mi1.00 mi13584-533940-713940-7114724(Top 52%)5011(Top 41%)5011(Top 92%)
35K21.75 mi0.75 mi13669-854001-614001-6116066(Top 57%)5809(Top 48%)5809(Top 106%)
23M23.00 mi1.25 mi13824-1554129-1284129-12815952(Top 56%)5852(Top 48%)5852(Top 107%)
24M24.00 mi1.00 mi14015-1914274-1454274-14516933(Top 60%)6457(Top 53%)6457(Top 118%)
40K24.85 mi0.85 mi14080-654321-474321-4716012(Top 56%)6039(Top 49%)6039(Top 110%)
25.2M25.20 mi0.35 mi14103-234348-274348-2715698(Top 55%)5909(Top 48%)5909(Top 108%)
Finish26.22 mi1.02 mi14144-414392-444392-4416039(Top 56%)6034(Top 49%)6034(Top 110%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 47%
×21story building
+97ft-345ft

Overall

13452

Females

3714

F18-39

3714

5K→10K

3.1 - 6.2 mi

Top 46%
×5story building
+79ft-138ft

Overall

13114

Females

3444

F18-39

3444

10K→15K

6.2 - 9.3 mi

Top 47%
×3story building
+67ft-78ft

Overall

13452

Females

3714

F18-39

3714

15K→20K

9.3 - 12.4 mi

Top 47%
×5story building
+106ft-86ft

Overall

13421

Females

3773

F18-39

3773

20K→Half

12.4 - 13.1 mi

Top 47%
×2story building
+19ft-37ft

Overall

13442

Females

3753

F18-39

3753

Half→25K

13.1 - 15.5 mi

Top 49%
×4story building
+66ft-88ft

Overall

13974

Females

4196

F18-39

4196

25K→30K

15.5 - 18.6 mi

Top 52%
×9story building
+181ft-148ft

Overall

14810

Females

4801

F18-39

4801

30K→20M

18.6 - 20.0 mi

Top 54%
×5story building
+64ft-50ft

Overall

15426

Females

5276

F18-39

5276

20M→21M

20.0 - 21.0 mi

Top 52%
×8story building
+106ft-24ft

Overall

14724

Females

5011

F18-39

5011

21M→35K

21.0 - 21.8 mi

Top 57%
×7story building
+17ft-86ft

Overall

16066

Females

5809

F18-39

5809

35K→23M

21.8 - 23.0 mi

Top 56%
×5story building
+23ft-63ft

Overall

15952

Females

5852

F18-39

5852

23M→24M

23.0 - 24.0 mi

Top 60%
×6story building
+12ft-82ft

Overall

16933

Females

6457

F18-39

6457

24M→40K

24.0 - 24.9 mi

Top 56%
×1story
+6ft-20ft

Overall

16012

Females

6039

F18-39

6039

40K→25.2M

24.9 - 25.2 mi

Top 55%
×1story
+13ft-16ft

Overall

15698

Females

5909

F18-39

5909

25.2M→Finish

25.2 - 26.2 mi

Top 56%
×2story building
+22ft-21ft

Overall

16039

Females

6034

F18-39

6034

Passing Analysis

Category:
Athletes Passed
1111
Passed By
3276
Net Change
-2165
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11979
5K → 10K105594-489#11979#12468
10K → 15K88395-307#12468#12775
15K → 20K162282-120#12775#12895
20K → Half2933-4#12895#12899
Half → 25K107270-163#12899#13062
25K → 30K150490-340#13062#13402
30K → 20M90219-129#13402#13531
20M → 21M87140-53#13531#13584
21M → 35K34119-85#13584#13669
35K → 23M76231-155#13669#13824
23M → 24M43234-191#13824#14015
24M → 40K53118-65#14015#14080
40K → 25.2M2851-23#14080#14103
25.2M → Finish59100-41#14103#14144
TOTALS11113276-2165
📊

Passing Visuals

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