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BOSTON MARATHON 2025

Bronwyn Shields

MA

Bib: 15202 F

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

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:34/mi
23:32
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:45/mi
47:37
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
8:13/mi
1:13:10
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:40/mi
1:36:58
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:37/mi
1:42:10
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
10:03/mi
2:06:33
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:01/mi
2:31:28
↑ 181↓ 1480.2%
138 ft elev
20M
14:19/mi
2:50:56
↑ 64↓ 500.2%
148 ft elev
21M
10:07/mi
3:01:03
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
12:46/mi
3:10:36
↑ 17↓ 861.7%
156 ft elev
23M
11:57/mi
3:25:34
↑ 23↓ 630.6%
116 ft elev
24M
11:40/mi
3:37:14
↓ 821.3%
34 ft elev
40K· 24.85 mi
10:57/mi
3:46:36
↓ 200.3%
20 ft elev
25.2M
8:25/mi
3:49:30
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
9:46/mi
3:59:27
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:42:10
Pace7:48 /mi
2nd Half
Distance13.11 mi
Time2:17:17
Pace10:28 /mi
📊Positive Split: 34.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:56:0223:327:3423:32
7:34
-
10K
6.21 mi11:20:0747:377:4024:05
7:45
+0:11
15K
9.32 mi11:45:401:13:107:5125:33
8:13
+0:28
20K
12.43 mi12:09:281:36:587:4823:48
7:40
-0:33
Half
13.11 mi12:14:401:42:107:485:12
7:37
-0:03
25K
15.53 mi12:39:032:06:338:0924:23
10:03
+2:26
30K
18.64 mi13:03:582:31:288:0824:55
8:01
-2:02
20M
20.00 mi13:23:262:50:568:3319:28
14:19
+6:18
21M
21.00 mi13:33:333:01:038:3710:07
10:07
-4:12
35K
21.75 mi13:43:063:10:368:469:33
12:46
+2:39
23M
23.00 mi13:58:043:25:348:5614:58
11:57
-0:49
24M
24.00 mi14:09:443:37:149:0311:40
11:40
-0:17
40K
24.85 mi14:19:063:46:369:079:22
10:57
-0:43
25.2M
25.20 mi14:22:003:49:309:062:54
8:25
-2:32
Finish
26.22 mi14:31:573:59:279:089:57
9:46
+1:21

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

7:34 /mi

Average Pace

9:08 /mi

Slowest Pace

14:19 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:09:59

54% of race

Time at Steady Pace

44:27

19% of race

Time at Slower Pace

1:05:01

27% of race

Average Pace: 9:08 /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 mi10:56:0223:327:3423:32
7:34
#12920
10K
6.21 mi11:20:0747:377:4024:05
7:45
#13627
15K
9.32 mi11:45:401:13:107:5125:33
8:13
#15088
20K
12.43 mi12:09:281:36:587:4823:48
7:40
#14271
Half
13.11 mi12:14:401:42:107:485:12
7:37
#14198
25K
15.53 mi12:39:032:06:338:0924:23
10:03
#16615
30K
18.64 mi13:03:582:31:288:0824:55
8:01
#15711
20M
20.00 mi13:23:262:50:568:3319:28
14:19
#18074
21M
21.00 mi13:33:333:01:038:3710:07
10:07
#18147
35K
21.75 mi13:43:063:10:368:469:33
12:46
#18907
23M
23.00 mi13:58:043:25:348:5614:58
11:57
#19597
24M
24.00 mi14:09:443:37:149:0311:40
11:40
#20060
40K
24.85 mi14:19:063:46:369:079:22
10:57
#20258
25.2M
25.20 mi14:22:003:49:309:062:54
8:25
#20104
Finish
26.22 mi14:31:573:59:279:089:57
9:46
#20243
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi12920327932791756760596059
10K6.21 mi3.10 mi13627-7073725-4463725-4461437141834183
15K9.32 mi3.11 mi15088-14614610-8854610-8851756760596059
20K12.43 mi3.11 mi14271+8174161+4494161+4491207230433043
Half13.11 mi0.68 mi14198+734122+394122+391287134503450
25K15.53 mi2.42 mi16615-24175534-14125534-14122339994229422
30K18.64 mi3.11 mi15711+9045059+4755059+4751155830733073
20M20.00 mi1.36 mi18074-23636467-14086467-1408275291183511835
21M21.00 mi1.00 mi18147-736522-556522-551875272107210
35K21.75 mi0.75 mi18907-7606975-4536975-453267611146611466
23M23.00 mi1.25 mi19597-6907398-4237398-423250561063110631
24M24.00 mi1.00 mi20060-4637671-2737671-273251931072310723
40K24.85 mi0.85 mi20258-1987798-1277798-1272304797279727
25.2M25.20 mi0.35 mi20104+1547724+747724+74840422842284
Finish26.22 mi1.02 mi20243-1397805-817805-812214492319231

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 62%
×21story building
+97ft-345ft

Overall

17567

Females

6059

F18-39

6059

5K→10K

3.1 - 6.2 mi

Top 51%
×5story building
+79ft-138ft

Overall

14371

Females

4183

F18-39

4183

10K→15K

6.2 - 9.3 mi

Top 62%
×3story building
+67ft-78ft

Overall

17567

Females

6059

F18-39

6059

15K→20K

9.3 - 12.4 mi

Top 43%
×5story building
+106ft-86ft

Overall

12072

Females

3043

F18-39

3043

20K→Half

12.4 - 13.1 mi

Top 45%
×2story building
+19ft-37ft

Overall

12871

Females

3450

F18-39

3450

Half→25K

13.1 - 15.5 mi

Top 82%
×4story building
+66ft-88ft

Overall

23399

Females

9422

F18-39

9422

25K→30K

15.5 - 18.6 mi

Top 41%
×9story building
+181ft-148ft

Overall

11558

Females

3073

F18-39

3073

30K→20M

18.6 - 20.0 mi

Top 97%
×5story building
+64ft-50ft

Overall

27529

Females

11835

F18-39

11835

20M→21M

20.0 - 21.0 mi

Top 66%
×8story building
+106ft-24ft

Overall

18752

Females

7210

F18-39

7210

21M→35K

21.0 - 21.8 mi

Top 94%
×7story building
+17ft-86ft

Overall

26761

Females

11466

F18-39

11466

35K→23M

21.8 - 23.0 mi

Top 88%
×5story building
+23ft-63ft

Overall

25056

Females

10631

F18-39

10631

23M→24M

23.0 - 24.0 mi

Top 89%
×6story building
+12ft-82ft

Overall

25193

Females

10723

F18-39

10723

24M→40K

24.0 - 24.9 mi

Top 81%
×1story
+6ft-20ft

Overall

23047

Females

9727

F18-39

9727

40K→25.2M

24.9 - 25.2 mi

Top 30%
×1story
+13ft-16ft

Overall

8404

Females

2284

F18-39

2284

25.2M→Finish

25.2 - 26.2 mi

Top 78%
×2story building
+22ft-21ft

Overall

22144

Females

9231

F18-39

9231

Passing Analysis

Category:
Athletes Passed
2226
Passed By
9549
Net Change
-7323
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12920
5K → 10K88795-707#12920#13627
10K → 15K231484-1461#13627#15088
15K → 20K8214+817#15088#14271
20K → Half818+73#14271#14198
Half → 25K52422-2417#14198#16615
25K → 30K9062+904#16615#15711
30K → 20M42367-2363#15711#18074
20M → 21M72145-73#18074#18147
21M → 35K7767-760#18147#18907
35K → 23M10700-690#18907#19597
23M → 24M12475-463#19597#20060
24M → 40K19217-198#20060#20258
40K → 25.2M1540+154#20258#20104
25.2M → Finish24163-139#20104#20243
TOTALS22269549-7323

Passing Charts

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