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BOSTON MARATHON 2025

Sarah Stacks

Bib: 17388•F

NY

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 28%
Gender (Female)
#0 / 12228
Top 11%
Division (F18-39)
#0 / 5469
Top 20%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:23
Rank: #12465
Start → 5K
23:23 | 7:32/mi
10K· 6.21 mi
46:34
Rank: #12072 (+393)
5K → 10K
23:11 | 7:28/mi
15K· 9.32 mi
1:09:32
Rank: #11627 (+445)
10K → 15K
22:58 | 7:24/mi
20K· 12.43 mi
1:32:27
Rank: #11114 (+513)
15K → 20K
22:55 | 7:23/mi
Half· 13.11 mi
1:37:25
Rank: #11035 (+79)
20K → Half
4:58 | 7:17/mi
25K· 15.53 mi
1:55:16
Rank: #10608 (+427)
Half → 25K
17:51 | 7:22/mi
30K· 18.64 mi
2:18:26
Rank: #9925 (+683)
25K → 30K
23:10 | 7:27/mi
20M
2:28:21
Rank: #9533 (+392)
30K → 20M
9:55 | 7:18/mi
21M
2:35:48
Rank: #9150 (+383)
20M → 21M
7:27 | 7:27/mi
35K· 21.75 mi
2:41:07
Rank: #8990 (+160)
21M → 35K
5:19 | 7:06/mi
23M
2:50:07
Rank: #8604 (+386)
35K → 23M
9:00 | 7:11/mi
24M
2:57:12
Rank: #8359 (+245)
23M → 24M
7:05 | 7:05/mi
40K· 24.85 mi
3:03:23
Rank: #8195 (+164)
24M → 40K
6:11 | 7:14/mi
25.2M
3:05:58
Rank: #8094 (+101)
40K → 25.2M
2:35 | 7:29/mi
Finish· 26.22 mi
3:12:56
Rank: #7875 (+219)
25.2M → Finish
6:58 | 6:50/mi

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time1:37:25
Pace7:26 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:35:31
Pace7:17 /mi
📊Negative Split: 2.0% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:13:3923:237:3223:23
7:32
-
10K
6.21 mi11:36:5046:347:3023:11
7:28
-0:04
15K
9.32 mi11:59:481:09:327:2822:58
7:24
-0:04
20K
12.43 mi12:22:431:32:277:2622:55
7:23
-0:01
Half
13.11 mi12:27:411:37:257:264:58
7:17
-0:06
25K
15.53 mi12:45:321:55:167:2517:51
7:22
+0:05
30K
18.64 mi13:08:422:18:267:2623:10
7:27
+0:05
20M
20.00 mi13:18:372:28:217:259:55
7:18
-0:09
21M
21.00 mi13:26:042:35:487:257:27
7:27
+0:09
35K
21.75 mi13:31:232:41:077:255:19
7:06
-0:21
23M
23.00 mi13:40:232:50:077:249:00
7:11
+0:05
24M
24.00 mi13:47:282:57:127:237:05
7:05
-0:06
40K
24.85 mi13:53:393:03:237:236:11
7:14
+0:09
25.2M
25.20 mi13:56:143:05:587:232:35
7:29
+0:15
Finish
26.22 mi14:03:123:12:567:226:58
6:50
-0:39

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

6:50 /mi

Average Pace

7:22 /mi

Slowest Pace

7:32 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:49:33

88% of race

Time at Steady Pace

23:23

12% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:21 /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 mi11:13:3923:237:3223:23
7:32
#12465
10K
6.21 mi11:36:5046:347:3023:11
7:28
#12072
15K
9.32 mi11:59:481:09:327:2822:58
7:24
#11627
20K
12.43 mi12:22:431:32:277:2622:55
7:23
#11114
Half
13.11 mi12:27:411:37:257:264:58
7:17
#11035
25K
15.53 mi12:45:321:55:167:2517:51
7:22
#10608
30K
18.64 mi13:08:422:18:267:2623:10
7:27
#9925
20M
20.00 mi13:18:372:28:217:259:55
7:18
#9533
21M
21.00 mi13:26:042:35:487:257:27
7:27
#9150
35K
21.75 mi13:31:232:41:077:255:19
7:06
#8990
23M
23.00 mi13:40:232:50:077:249:00
7:11
#8604
24M
24.00 mi13:47:282:57:127:237:05
7:05
#8359
40K
24.85 mi13:53:393:03:237:236:11
7:14
#8195
25.2M
25.20 mi13:56:143:05:587:232:35
7:29
#8094
Finish
26.22 mi14:03:123:12:567:226:58
6:50
#7875
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi124653042304210802(Top 38%)2265(Top 19%)2265(Top 41%)
10K6.21 mi3.10 mi12072+3932848+1942848+19411734(Top 41%)2676(Top 22%)2676(Top 49%)
15K9.32 mi3.11 mi11627+4452633+2152633+21510802(Top 38%)2265(Top 19%)2265(Top 41%)
20K12.43 mi3.11 mi11114+5132404+2292404+2299690(Top 34%)1820(Top 15%)1820(Top 33%)
Half13.11 mi0.68 mi11035+792357+472357+479842(Top 35%)1858(Top 15%)1858(Top 34%)
25K15.53 mi2.42 mi10608+4272189+1682189+1688847(Top 31%)1570(Top 13%)1570(Top 29%)
30K18.64 mi3.11 mi9925+6831920+2691920+2697448(Top 26%)1185(Top 10%)1185(Top 22%)
20M20.00 mi1.36 mi9533+3921788+1321788+1325813(Top 20%)741(Top 6%)741(Top 14%)
21M21.00 mi1.00 mi9150+3831638+1501638+1504398(Top 15%)464(Top 4%)464(Top 8%)
35K21.75 mi0.75 mi8990+1601591+471591+476072(Top 21%)951(Top 8%)951(Top 17%)
23M23.00 mi1.25 mi8604+3861473+1181473+1184833(Top 17%)631(Top 5%)631(Top 12%)
24M24.00 mi1.00 mi8359+2451407+661407+665162(Top 18%)790(Top 6%)790(Top 14%)
40K24.85 mi0.85 mi8195+1641376+311376+315268(Top 19%)867(Top 7%)867(Top 16%)
25.2M25.20 mi0.35 mi8094+1011352+241352+243468(Top 12%)435(Top 4%)435(Top 8%)
Finish26.22 mi1.02 mi7875+2191304+481304+484758(Top 17%)783(Top 6%)783(Top 14%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 38%
×21stories
+97ft-345ft

Overall

10802

Females

2265

F18-39

2265

5K→10K

3.1 - 6.2 mi

Top 41%
×5stories
+79ft-138ft

Overall

11734

Females

2676

F18-39

2676

10K→15K

6.2 - 9.3 mi

Top 38%
×3stories
+67ft-78ft

Overall

10802

Females

2265

F18-39

2265

15K→20K

9.3 - 12.4 mi

Top 34%
×5stories
+106ft-86ft

Overall

9690

Females

1820

F18-39

1820

20K→Half

12.4 - 13.1 mi

Top 35%
×2stories
+19ft-37ft

Overall

9842

Females

1858

F18-39

1858

Half→25K

13.1 - 15.5 mi

Top 31%
×4stories
+66ft-88ft

Overall

8847

Females

1570

F18-39

1570

25K→30K

15.5 - 18.6 mi

Top 26%
×9stories
+181ft-148ft

Overall

7448

Females

1185

F18-39

1185

30K→20M

18.6 - 20.0 mi

Top 20%
×5stories
+64ft-50ft

Overall

5813

Females

741

F18-39

741

20M→21M

20.0 - 21.0 mi

Top 15%
×8stories
+106ft-24ft

Overall

4398

Females

464

F18-39

464

21M→35K

21.0 - 21.8 mi

Top 21%
×7stories
+17ft-86ft

Overall

6072

Females

951

F18-39

951

35K→23M

21.8 - 23.0 mi

Top 17%
×5stories
+23ft-63ft

Overall

4833

Females

631

F18-39

631

23M→24M

23.0 - 24.0 mi

Top 18%
×6stories
+12ft-82ft

Overall

5162

Females

790

F18-39

790

24M→40K

24.0 - 24.9 mi

Top 19%
×1story
+6ft-20ft

Overall

5268

Females

867

F18-39

867

40K→25.2M

24.9 - 25.2 mi

Top 12%
×1story
+13ft-16ft

Overall

3468

Females

435

F18-39

435

25.2M→Finish

25.2 - 26.2 mi

Top 17%
×2stories
+22ft-21ft

Overall

4758

Females

783

F18-39

783

Passing Analysis

Category:
Athletes Passed
4807*
Passed By
217
Net Change
+4590
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12465
5K → 10K514121+393#12465#12072
10K → 15K47732+445#12072#11627
15K → 20K52916+513#11627#11114
20K → Half9213+79#11114#11035
Half → 25K4358+427#11035#10608
25K → 30K689*6+683#10608#9925
30K → 20M3920+392#9925#9533
20M → 21M3830+383#9533#9150
21M → 35K1644+160#9150#8990
35K → 23M3860+386#8990#8604
23M → 24M2494+245#8604#8359
24M → 40K1706+164#8359#8195
40K → 25.2M1043+101#8195#8094
25.2M → Finish2234+219#8094#7875
TOTALS4807*217+4590

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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