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BOSTON MARATHON 2025

Chelsea Frengs

Bib: 12253•F

NY

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
8:30/mi
26:26
↑ 97↓ 3451.5%
10K· 6.21 mi
8:56/mi
54:11
↑ 79↓ 1380.4%
15K· 9.32 mi
9:03/mi
1:22:18
↑ 67↓ 78
20K· 12.43 mi
9:17/mi
1:51:09
↑ 106↓ 860.1%
Half· 13.11 mi
8:37/mi
1:57:02
↑ 19↓ 370.5%
25K· 15.53 mi
9:04/mi
2:19:01
↑ 66↓ 880.2%
30K· 18.64 mi
9:13/mi
2:47:39
↑ 181↓ 1480.2%
20M
9:09/mi
3:00:05
↑ 64↓ 500.2%
21M
9:15/mi
3:09:20
↑ 106↓ 241.6%
35K· 21.75 mi
8:33/mi
3:15:44
↑ 17↓ 861.7%
23M
8:46/mi
3:26:43
↑ 23↓ 630.6%
24M
8:52/mi
3:35:35
↓ 821.3%
40K· 24.85 mi
8:59/mi
3:43:16
↓ 200.3%
25.2M
9:17/mi
3:46:28
↑ 13↓ 160.2%
Finish· 26.22 mi
7:48/mi
3:54:25
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:57:02
Pace8:56 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:57:23
Pace8:57 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:54:2226:268:3026:26
8:30
-
10K
6.21 mi11:22:0754:118:4327:45
8:56
+0:26
15K
9.32 mi11:50:141:22:188:5028:07
9:03
+0:07
20K
12.43 mi12:19:051:51:098:5728:51
9:17
+0:14
Half
13.11 mi12:24:581:57:028:565:53
8:37
-0:40
25K
15.53 mi12:46:572:19:018:5721:59
9:04
+0:27
30K
18.64 mi13:15:352:47:399:0028:38
9:13
+0:09
20M
20.00 mi13:28:013:00:059:0012:26
9:09
-0:04
21M
21.00 mi13:37:163:09:209:019:15
9:15
+0:06
35K
21.75 mi13:43:403:15:449:006:24
8:33
-0:42
23M
23.00 mi13:54:393:26:438:5910:59
8:46
+0:13
24M
24.00 mi14:03:313:35:358:598:52
8:52
+0:06
40K
24.85 mi14:11:123:43:168:597:41
8:59
+0:07
25.2M
25.20 mi14:14:243:46:288:593:12
9:17
+0:18
Finish
26.22 mi14:22:213:54:258:577:57
7:48
-1:29

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

7:48 /mi

Average Pace

8:57 /mi

Slowest Pace

9:17 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

40:47

17% of race

Time at Steady Pace

2:03:42

53% of race

Time at Slower Pace

1:09:56

30% of race

Average Pace: 8:56 /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 mi10:54:2226:268:3026:26
8:30
#19937
10K
6.21 mi11:22:0754:118:4327:45
8:56
#21001
15K
9.32 mi11:50:141:22:188:5028:07
9:03
#21432
20K
12.43 mi12:19:051:51:098:5728:51
9:17
#21671
Half
13.11 mi12:24:581:57:028:565:53
8:37
#21597
25K
15.53 mi12:46:572:19:018:5721:59
9:04
#21340
30K
18.64 mi13:15:352:47:399:0028:38
9:13
#20839
20M
20.00 mi13:28:013:00:059:0012:26
9:09
#20577
21M
21.00 mi13:37:163:09:209:019:15
9:15
#20274
35K
21.75 mi13:43:403:15:449:006:24
8:33
#20124
23M
23.00 mi13:54:393:26:438:5910:59
8:46
#19855
24M
24.00 mi14:03:313:35:358:598:52
8:52
#19711
40K
24.85 mi14:11:123:43:168:597:41
8:59
#19583
25.2M
25.20 mi14:14:243:46:288:593:12
9:17
#19483
Finish
26.22 mi14:22:213:54:258:577:57
7:48
#19230
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi199377464746422252(Top 78%)8692(Top 71%)8692(Top 159%)
10K6.21 mi3.10 mi21001-10648055-5918055-59122088(Top 78%)8642(Top 71%)8642(Top 158%)
15K9.32 mi3.11 mi21432-4318270-2158270-21522252(Top 78%)8692(Top 71%)8692(Top 159%)
20K12.43 mi3.11 mi21671-2398422-1528422-15222230(Top 78%)8712(Top 71%)8712(Top 159%)
Half13.11 mi0.68 mi21597+748378+448378+4419963(Top 70%)7451(Top 61%)7451(Top 136%)
25K15.53 mi2.42 mi21340+2578236+1428236+14220211(Top 71%)7650(Top 63%)7650(Top 140%)
30K18.64 mi3.11 mi20839+5018007+2298007+22918724(Top 66%)6967(Top 57%)6967(Top 127%)
20M20.00 mi1.36 mi20577+2627871+1367871+13617562(Top 62%)6459(Top 53%)6459(Top 118%)
21M21.00 mi1.00 mi20274+3037734+1377734+13714929(Top 53%)5145(Top 42%)5145(Top 94%)
35K21.75 mi0.75 mi20124+1507658+767658+7615864(Top 56%)5721(Top 47%)5721(Top 105%)
23M23.00 mi1.25 mi19855+2697542+1167542+11614997(Top 53%)5343(Top 44%)5343(Top 98%)
24M24.00 mi1.00 mi19711+1447484+587484+5816706(Top 59%)6331(Top 52%)6331(Top 116%)
40K24.85 mi0.85 mi19583+1287426+587426+5816267(Top 57%)6199(Top 51%)6199(Top 113%)
25.2M25.20 mi0.35 mi19483+1007376+507376+5013473(Top 47%)4782(Top 39%)4782(Top 87%)
Finish26.22 mi1.02 mi19230+2537263+1137263+11311505(Top 41%)3722(Top 30%)3722(Top 68%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 78%
×21story building
+97ft-345ft

Overall

22252

Females

8692

F18-39

8692

5K→10K

3.1 - 6.2 mi

Top 78%
×5story building
+79ft-138ft

Overall

22088

Females

8642

F18-39

8642

10K→15K

6.2 - 9.3 mi

Top 78%
×3story building
+67ft-78ft

Overall

22252

Females

8692

F18-39

8692

15K→20K

9.3 - 12.4 mi

Top 78%
×5story building
+106ft-86ft

Overall

22230

Females

8712

F18-39

8712

20K→Half

12.4 - 13.1 mi

Top 70%
×2story building
+19ft-37ft

Overall

19963

Females

7451

F18-39

7451

Half→25K

13.1 - 15.5 mi

Top 71%
×4story building
+66ft-88ft

Overall

20211

Females

7650

F18-39

7650

25K→30K

15.5 - 18.6 mi

Top 66%
×9story building
+181ft-148ft

Overall

18724

Females

6967

F18-39

6967

30K→20M

18.6 - 20.0 mi

Top 62%
×5story building
+64ft-50ft

Overall

17562

Females

6459

F18-39

6459

20M→21M

20.0 - 21.0 mi

Top 53%
×8story building
+106ft-24ft

Overall

14929

Females

5145

F18-39

5145

21M→35K

21.0 - 21.8 mi

Top 56%
×7story building
+17ft-86ft

Overall

15864

Females

5721

F18-39

5721

35K→23M

21.8 - 23.0 mi

Top 53%
×5story building
+23ft-63ft

Overall

14997

Females

5343

F18-39

5343

23M→24M

23.0 - 24.0 mi

Top 59%
×6story building
+12ft-82ft

Overall

16706

Females

6331

F18-39

6331

24M→40K

24.0 - 24.9 mi

Top 57%
×1story
+6ft-20ft

Overall

16267

Females

6199

F18-39

6199

40K→25.2M

24.9 - 25.2 mi

Top 47%
×1story
+13ft-16ft

Overall

13473

Females

4782

F18-39

4782

25.2M→Finish

25.2 - 26.2 mi

Top 41%
×2story building
+22ft-21ft

Overall

11505

Females

3722

F18-39

3722

Passing Analysis

Category:
Athletes Passed
2783
Passed By
2076
Net Change
+707
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19937
5K → 10K431107-1064#19937#21001
10K → 15K90521-431#21001#21432
15K → 20K130369-239#21432#21671
20K → Half773+74#21671#21597
Half → 25K28427+257#21597#21340
25K → 30K51716+501#21340#20839
30K → 20M2675+262#20839#20577
20M → 21M3052+303#20577#20274
21M → 35K1544+150#20274#20124
35K → 23M2734+269#20124#19855
23M → 24M1539+144#19855#19711
24M → 40K1357+128#19711#19583
40K → 25.2M1011+100#19583#19483
25.2M → Finish2541+253#19483#19230
TOTALS27832076+707
📊

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