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BOSTON MARATHON 2025

Samantha Demagistris

Bib: 27582•F

MA

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

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
9:32/mi
29:36
↑ 97↓ 3451.5%
10K· 6.21 mi
9:29/mi
59:05
↑ 79↓ 1380.4%
15K· 9.32 mi
9:21/mi
1:28:08
↑ 67↓ 78
20K· 12.43 mi
9:18/mi
1:57:03
↑ 106↓ 860.1%
Half· 13.11 mi
8:49/mi
2:03:04
↑ 19↓ 370.5%
25K· 15.53 mi
9:02/mi
2:24:59
↑ 66↓ 880.2%
30K· 18.64 mi
9:12/mi
2:53:34
↑ 181↓ 1480.2%
20M
9:37/mi
3:06:38
↑ 64↓ 500.2%
21M
12:29/mi
3:19:07
↑ 106↓ 241.6%
35K· 21.75 mi
10:47/mi
3:27:11
↑ 17↓ 861.7%
23M
11:21/mi
3:41:24
↑ 23↓ 630.6%
24M
10:05/mi
3:51:29
↓ 821.3%
40K· 24.85 mi
10:11/mi
4:00:11
↓ 200.3%
25.2M
11:42/mi
4:04:13
↑ 13↓ 160.2%
Finish· 26.22 mi
10:01/mi
4:14:25
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:03:04
Pace9:23 /mi
2nd Half
Distance13.11 mi
Time2:11:21
Pace10:01 /mi
📊Positive Split: 6.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:45:5129:369:3229:36
9:32
-
10K
6.21 mi12:15:2059:059:3129:29
9:29
-0:03
15K
9.32 mi12:44:231:28:089:2729:03
9:21
-0:08
20K
12.43 mi13:13:181:57:039:2528:55
9:18
-0:03
Half
13.11 mi13:19:192:03:049:236:01
8:49
-0:29
25K
15.53 mi13:41:142:24:599:2021:55
9:02
+0:13
30K
18.64 mi14:09:492:53:349:1928:35
9:12
+0:10
20M
20.00 mi14:22:533:06:389:2013:04
9:37
+0:25
21M
21.00 mi14:35:223:19:079:2912:29
12:29
+2:52
35K
21.75 mi14:43:263:27:119:328:04
10:47
-1:42
23M
23.00 mi14:57:393:41:249:3814:13
11:21
+0:34
24M
24.00 mi15:07:443:51:299:3910:05
10:05
-1:16
40K
24.85 mi15:16:264:00:119:408:42
10:11
+0:06
25.2M
25.20 mi15:20:284:04:139:414:02
11:42
+1:31
Finish
26.22 mi15:30:404:14:259:4310:12
10:01
-1:41

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

8:49 /mi

Average Pace

9:43 /mi

Slowest Pace

12:29 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

27:56

11% of race

Time at Steady Pace

2:58:59

70% of race

Time at Slower Pace

47:30

19% of race

Average Pace: 9:42 /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 mi11:45:5129:369:3229:36
9:32
#24338
10K
6.21 mi12:15:2059:059:3129:29
9:29
#24207
15K
9.32 mi12:44:231:28:089:2729:03
9:21
#23920
20K
12.43 mi13:13:181:57:039:2528:55
9:18
#23537
Half
13.11 mi13:19:192:03:049:236:01
8:49
#23404
25K
15.53 mi13:41:142:24:599:2021:55
9:02
#22904
30K
18.64 mi14:09:492:53:349:1928:35
9:12
#22199
20M
20.00 mi14:22:533:06:389:2013:04
9:37
#22008
21M
21.00 mi14:35:223:19:079:2912:29
12:29
#22181
35K
21.75 mi14:43:263:27:119:328:04
10:47
#22266
23M
23.00 mi14:57:393:41:249:3814:13
11:21
#22380
24M
24.00 mi15:07:443:51:299:3910:05
10:05
#22332
40K
24.85 mi15:16:264:00:119:408:42
10:11
#22284
25.2M
25.20 mi15:20:284:04:139:414:02
11:42
#22278
Finish
26.22 mi15:30:404:14:259:4310:12
10:01
#22277
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi243389867986723351(Top 82%)9290(Top 76%)9290(Top 170%)
10K6.21 mi3.10 mi24207+1319801+669801+6624080(Top 85%)9728(Top 80%)9728(Top 178%)
15K9.32 mi3.11 mi23920+2879629+1729629+17223351(Top 82%)9290(Top 76%)9290(Top 170%)
20K12.43 mi3.11 mi23537+3839427+2029427+20222292(Top 78%)8748(Top 72%)8748(Top 160%)
Half13.11 mi0.68 mi23404+1339343+849343+8421050(Top 74%)8083(Top 66%)8083(Top 148%)
25K15.53 mi2.42 mi22904+5009088+2559088+25520096(Top 71%)7587(Top 62%)7587(Top 139%)
30K18.64 mi3.11 mi22199+7058732+3568732+35618649(Top 66%)6922(Top 57%)6922(Top 127%)
20M20.00 mi1.36 mi22008+1918643+898643+8919691(Top 69%)7629(Top 62%)7629(Top 139%)
21M21.00 mi1.00 mi22181-1738767-1248767-12424388(Top 86%)10228(Top 84%)10228(Top 187%)
35K21.75 mi0.75 mi22266-858827-608827-6023782(Top 84%)9936(Top 81%)9936(Top 182%)
23M23.00 mi1.25 mi22380-1148928-1018928-10124004(Top 85%)10099(Top 83%)10099(Top 185%)
24M24.00 mi1.00 mi22332+488924+48924+421606(Top 76%)8915(Top 73%)8915(Top 163%)
40K24.85 mi0.85 mi22284+488909+158909+1521024(Top 74%)8682(Top 71%)8682(Top 159%)
25.2M25.20 mi0.35 mi22278+68913-48913-422578(Top 79%)9454(Top 77%)9454(Top 173%)
Finish26.22 mi1.02 mi22277+18936-238936-2322973(Top 81%)9652(Top 79%)9652(Top 176%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 82%
×21story building
+97ft-345ft

Overall

23351

Females

9290

F18-39

9290

5K→10K

3.1 - 6.2 mi

Top 85%
×5story building
+79ft-138ft

Overall

24080

Females

9728

F18-39

9728

10K→15K

6.2 - 9.3 mi

Top 82%
×3story building
+67ft-78ft

Overall

23351

Females

9290

F18-39

9290

15K→20K

9.3 - 12.4 mi

Top 78%
×5story building
+106ft-86ft

Overall

22292

Females

8748

F18-39

8748

20K→Half

12.4 - 13.1 mi

Top 74%
×2story building
+19ft-37ft

Overall

21050

Females

8083

F18-39

8083

Half→25K

13.1 - 15.5 mi

Top 71%
×4story building
+66ft-88ft

Overall

20096

Females

7587

F18-39

7587

25K→30K

15.5 - 18.6 mi

Top 66%
×9story building
+181ft-148ft

Overall

18649

Females

6922

F18-39

6922

30K→20M

18.6 - 20.0 mi

Top 69%
×5story building
+64ft-50ft

Overall

19691

Females

7629

F18-39

7629

20M→21M

20.0 - 21.0 mi

Top 86%
×8story building
+106ft-24ft

Overall

24388

Females

10228

F18-39

10228

21M→35K

21.0 - 21.8 mi

Top 84%
×7story building
+17ft-86ft

Overall

23782

Females

9936

F18-39

9936

35K→23M

21.8 - 23.0 mi

Top 85%
×5story building
+23ft-63ft

Overall

24004

Females

10099

F18-39

10099

23M→24M

23.0 - 24.0 mi

Top 76%
×6story building
+12ft-82ft

Overall

21606

Females

8915

F18-39

8915

24M→40K

24.0 - 24.9 mi

Top 74%
×1story
+6ft-20ft

Overall

21024

Females

8682

F18-39

8682

40K→25.2M

24.9 - 25.2 mi

Top 79%
×1story
+13ft-16ft

Overall

22578

Females

9454

F18-39

9454

25.2M→Finish

25.2 - 26.2 mi

Top 81%
×2story building
+22ft-21ft

Overall

22973

Females

9652

F18-39

9652

Passing Analysis

Category:
Athletes Passed
2885
Passed By
824
Net Change
+2061
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#24338
5K → 10K298167+131#24338#24207
10K → 15K32942+287#24207#23920
15K → 20K39613+383#23920#23537
20K → Half1341+133#23537#23404
Half → 25K5033+500#23404#22904
25K → 30K7072+705#22904#22199
30K → 20M20413+191#22199#22008
20M → 21M44217-173#22008#22181
21M → 35K18103-85#22181#22266
35K → 23M46160-114#22266#22380
23M → 24M8032+48#22380#22332
24M → 40K6719+48#22332#22284
40K → 25.2M2115+6#22284#22278
25.2M → Finish3837+1#22278#22277
TOTALS2885824+2061
📊

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