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BOSTON MARATHON 2025

Erin Zimmer

Bib: 20498•F

IL

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 41%
Masters (Masters Women)
#0 / 6759
Top 28%
Division (F45-49)
#0 / 1813
Top 33%
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
8:10/mi
25:21
↑ 97↓ 3451.5%
10K· 6.21 mi
7:55/mi
49:58
↑ 79↓ 1380.4%
15K· 9.32 mi
7:56/mi
1:14:37
↑ 67↓ 78
20K· 12.43 mi
8:04/mi
1:39:41
↑ 106↓ 860.1%
Half· 13.11 mi
7:58/mi
1:45:07
↑ 19↓ 370.5%
25K· 15.53 mi
8:02/mi
2:04:35
↑ 66↓ 880.2%
30K· 18.64 mi
8:32/mi
2:31:05
↑ 181↓ 1480.2%
20M
8:47/mi
2:43:01
↑ 64↓ 500.2%
21M
9:22/mi
2:52:23
↑ 106↓ 241.6%
35K· 21.75 mi
8:51/mi
2:59:00
↑ 17↓ 861.7%
23M
8:56/mi
3:10:11
↑ 23↓ 630.6%
24M
8:41/mi
3:18:52
↓ 821.3%
40K· 24.85 mi
8:38/mi
3:26:15
↓ 200.3%
25.2M
9:28/mi
3:29:31
↑ 13↓ 160.2%
Finish· 26.22 mi
8:07/mi
3:37:47
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:45:07
Pace8:01 /mi
2nd Half
Distance13.11 mi
Time1:52:40
Pace8:36 /mi
📊Positive Split: 7.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:18:5825:218:1025:21
8:10
-
10K
6.21 mi11:43:3549:588:0224:37
7:55
-0:15
15K
9.32 mi12:08:141:14:378:0024:39
7:56
+0:01
20K
12.43 mi12:33:181:39:418:0125:04
8:04
+0:08
Half
13.11 mi12:38:441:45:078:015:26
7:58
-0:06
25K
15.53 mi12:58:122:04:358:0119:28
8:02
+0:04
30K
18.64 mi13:24:422:31:058:0626:30
8:32
+0:30
20M
20.00 mi13:36:382:43:018:0911:56
8:47
+0:15
21M
21.00 mi13:46:002:52:238:139:22
9:22
+0:35
35K
21.75 mi13:52:372:59:008:146:37
8:51
-0:31
23M
23.00 mi14:03:483:10:118:1611:11
8:56
+0:05
24M
24.00 mi14:12:293:18:528:178:41
8:41
-0:15
40K
24.85 mi14:19:523:26:158:187:23
8:38
-0:03
25.2M
25.20 mi14:23:083:29:318:193:16
9:28
+0:50
Finish
26.22 mi14:31:243:37:478:198:16
8:07
-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

7:55 /mi

Average Pace

8:19 /mi

Slowest Pace

9:28 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:55:25

81% of race

Time at Steady Pace

29:44

14% of race

Time at Slower Pace

12:38

6% of race

Average Pace: 8:18 /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 mi11:18:5825:218:1025:21
8:10
#17830
10K
6.21 mi11:43:3549:588:0224:37
7:55
#16850
15K
9.32 mi12:08:141:14:378:0024:39
7:56
#16382
20K
12.43 mi12:33:181:39:418:0125:04
8:04
#16101
Half
13.11 mi12:38:441:45:078:015:26
7:58
#16082
25K
15.53 mi12:58:122:04:358:0119:28
8:02
#15718
30K
18.64 mi13:24:422:31:058:0626:30
8:32
#15542
20M
20.00 mi13:36:382:43:018:0911:56
8:47
#15487
21M
21.00 mi13:46:002:52:238:139:22
9:22
#15457
35K
21.75 mi13:52:372:59:008:146:37
8:51
#15541
23M
23.00 mi14:03:483:10:118:1611:11
8:56
#15507
24M
24.00 mi14:12:293:18:528:178:41
8:41
#15513
40K
24.85 mi14:19:523:26:158:187:23
8:38
#15435
25.2M
25.20 mi14:23:083:29:318:193:16
9:28
#15407
Finish
26.22 mi14:31:243:37:478:198:16
8:07
#15330
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi178306234623415534(Top 55%)4879(Top 40%)4879(Top 269%)
10K6.21 mi3.10 mi16850+9805639+5955639+59515859(Top 56%)5043(Top 41%)5043(Top 278%)
15K9.32 mi3.11 mi16382+4685365+2745365+27415534(Top 55%)4879(Top 40%)4879(Top 269%)
20K12.43 mi3.11 mi16101+2815214+1515214+15115420(Top 54%)4872(Top 40%)4872(Top 269%)
Half13.11 mi0.68 mi16082+195201+135201+1315671(Top 55%)4991(Top 41%)4991(Top 275%)
25K15.53 mi2.42 mi15718+3645004+1975004+19714152(Top 50%)4286(Top 35%)4286(Top 236%)
30K18.64 mi3.11 mi15542+1764968+364968+3614950(Top 53%)4875(Top 40%)4875(Top 269%)
20M20.00 mi1.36 mi15487+554966+24966+215570(Top 55%)5339(Top 44%)5339(Top 294%)
21M21.00 mi1.00 mi15457+304988-224988-2215483(Top 55%)5441(Top 44%)5441(Top 300%)
35K21.75 mi0.75 mi15541-845058-705058-7017487(Top 62%)6613(Top 54%)6613(Top 365%)
23M23.00 mi1.25 mi15507+345073-155073-1515883(Top 56%)5821(Top 48%)5821(Top 321%)
24M24.00 mi1.00 mi15513-65094-215094-2115648(Top 55%)5714(Top 47%)5714(Top 315%)
40K24.85 mi0.85 mi15435+785090+45090+414299(Top 50%)5128(Top 42%)5128(Top 283%)
25.2M25.20 mi0.35 mi15407+285084+65084+614490(Top 51%)5279(Top 43%)5279(Top 291%)
Finish26.22 mi1.02 mi15330+775061+235061+2313709(Top 48%)4807(Top 39%)4807(Top 265%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 55%
×21story building
+97ft-345ft

Overall

15534

Females

4879

F45-49

4879

5K→10K

3.1 - 6.2 mi

Top 56%
×5story building
+79ft-138ft

Overall

15859

Females

5043

F45-49

5043

10K→15K

6.2 - 9.3 mi

Top 55%
×3story building
+67ft-78ft

Overall

15534

Females

4879

F45-49

4879

15K→20K

9.3 - 12.4 mi

Top 54%
×5story building
+106ft-86ft

Overall

15420

Females

4872

F45-49

4872

20K→Half

12.4 - 13.1 mi

Top 55%
×2story building
+19ft-37ft

Overall

15671

Females

4991

F45-49

4991

Half→25K

13.1 - 15.5 mi

Top 50%
×4story building
+66ft-88ft

Overall

14152

Females

4286

F45-49

4286

25K→30K

15.5 - 18.6 mi

Top 53%
×9story building
+181ft-148ft

Overall

14950

Females

4875

F45-49

4875

30K→20M

18.6 - 20.0 mi

Top 55%
×5story building
+64ft-50ft

Overall

15570

Females

5339

F45-49

5339

20M→21M

20.0 - 21.0 mi

Top 55%
×8story building
+106ft-24ft

Overall

15483

Females

5441

F45-49

5441

21M→35K

21.0 - 21.8 mi

Top 62%
×7story building
+17ft-86ft

Overall

17487

Females

6613

F45-49

6613

35K→23M

21.8 - 23.0 mi

Top 56%
×5story building
+23ft-63ft

Overall

15883

Females

5821

F45-49

5821

23M→24M

23.0 - 24.0 mi

Top 55%
×6story building
+12ft-82ft

Overall

15648

Females

5714

F45-49

5714

24M→40K

24.0 - 24.9 mi

Top 50%
×1story
+6ft-20ft

Overall

14299

Females

5128

F45-49

5128

40K→25.2M

24.9 - 25.2 mi

Top 51%
×1story
+13ft-16ft

Overall

14490

Females

5279

F45-49

5279

25.2M→Finish

25.2 - 26.2 mi

Top 48%
×2story building
+22ft-21ft

Overall

13709

Females

4807

F45-49

4807

Passing Analysis

Category:
Athletes Passed
3373
Passed By
873
Net Change
+2500
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17830
5K → 10K102646+980#17830#16850
10K → 15K50335+468#16850#16382
15K → 20K36483+281#16382#16101
20K → Half4021+19#16101#16082
Half → 25K37713+364#16082#15718
25K → 30K321145+176#15718#15542
30K → 20M14489+55#15542#15487
20M → 21M12393+30#15487#15457
21M → 35K37121-84#15457#15541
35K → 23M12389+34#15541#15507
23M → 24M6874-6#15507#15513
24M → 40K10426+78#15513#15435
40K → 25.2M4012+28#15435#15407
25.2M → Finish10326+77#15407#15330
TOTALS3373873+2500
📊

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