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BOSTON MARATHON 2025

Anna Birzle

Bib: 18346•F

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 37%
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
7:53/mi
24:30
↑ 97↓ 3451.5%
10K· 6.21 mi
7:51/mi
48:54
↑ 79↓ 1380.4%
15K· 9.32 mi
8:05/mi
1:14:02
↑ 67↓ 78
20K· 12.43 mi
7:59/mi
1:38:51
↑ 106↓ 860.1%
Half· 13.11 mi
7:58/mi
1:44:17
↑ 19↓ 370.5%
25K· 15.53 mi
8:06/mi
2:03:55
↑ 66↓ 880.2%
30K· 18.64 mi
8:23/mi
2:29:58
↑ 181↓ 1480.2%
20M
8:31/mi
2:41:33
↑ 64↓ 500.2%
21M
9:16/mi
2:50:49
↑ 106↓ 241.6%
35K· 21.75 mi
8:13/mi
2:56:58
↑ 17↓ 861.7%
23M
8:19/mi
3:07:23
↑ 23↓ 630.6%
24M
8:20/mi
3:15:43
↓ 821.3%
40K· 24.85 mi
8:31/mi
3:23:00
↓ 200.3%
25.2M
9:17/mi
3:26:12
↑ 13↓ 160.2%
Finish· 26.22 mi
7:51/mi
3:34:12
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:44:17
Pace7:57 /mi
2nd Half
Distance13.11 mi
Time1:49:55
Pace8:23 /mi
📊Positive Split: 5.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:2924:307:5324:30
7:53
-
10K
6.21 mi11:39:5348:547:5224:24
7:51
-0:02
15K
9.32 mi12:05:011:14:027:5725:08
8:05
+0:14
20K
12.43 mi12:29:501:38:517:5724:49
7:59
-0:06
Half
13.11 mi12:35:161:44:177:575:26
7:58
-0:01
25K
15.53 mi12:54:542:03:557:5919:38
8:06
+0:08
30K
18.64 mi13:20:572:29:588:0326:03
8:23
+0:17
20M
20.00 mi13:32:322:41:338:0511:35
8:31
+0:08
21M
21.00 mi13:41:482:50:498:089:16
9:16
+0:45
35K
21.75 mi13:47:572:56:588:086:09
8:13
-1:03
23M
23.00 mi13:58:223:07:238:0910:25
8:19
+0:06
24M
24.00 mi14:06:423:15:438:098:20
8:20
+0:01
40K
24.85 mi14:13:593:23:008:107:17
8:31
+0:11
25.2M
25.20 mi14:17:113:26:128:113:12
9:17
+0:46
Finish
26.22 mi14:25:113:34:128:118:00
7:51
-1:26

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

7:51 /mi

Average Pace

8:11 /mi

Slowest Pace

9:17 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:21:44

94% of race

Time at Steady Pace

0:00

0% of race

Time at Slower Pace

12:28

6% of race

Average Pace: 8:10 /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 mi11:15:2924:307:5324:30
7:53
#15559
10K
6.21 mi11:39:5348:547:5224:24
7:51
#15412
15K
9.32 mi12:05:011:14:027:5725:08
8:05
#15861
20K
12.43 mi12:29:501:38:517:5724:49
7:59
#15581
Half
13.11 mi12:35:161:44:177:575:26
7:58
#15580
25K
15.53 mi12:54:542:03:557:5919:38
8:06
#15378
30K
18.64 mi13:20:572:29:588:0326:03
8:23
#15104
20M
20.00 mi13:32:322:41:338:0511:35
8:31
#14963
21M
21.00 mi13:41:482:50:498:089:16
9:16
#14912
35K
21.75 mi13:47:572:56:588:086:09
8:13
#14844
23M
23.00 mi13:58:223:07:238:0910:25
8:19
#14654
24M
24.00 mi14:06:423:15:438:098:20
8:20
#14581
40K
24.85 mi14:13:593:23:008:107:17
8:31
#14501
25.2M
25.20 mi14:17:113:26:128:113:12
9:17
#14482
Finish
26.22 mi14:25:113:34:128:118:00
7:51
#14346
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi155594866486616672(Top 59%)5541(Top 45%)5541(Top 101%)
10K6.21 mi3.10 mi15412+1474781+854781+8515305(Top 54%)4725(Top 39%)4725(Top 86%)
15K9.32 mi3.11 mi15861-4495053-2725053-27216672(Top 59%)5541(Top 45%)5541(Top 101%)
20K12.43 mi3.11 mi15581+2804915+1384915+13814849(Top 52%)4562(Top 37%)4562(Top 83%)
Half13.11 mi0.68 mi15580+14915491515641(Top 55%)4961(Top 41%)4961(Top 91%)
25K15.53 mi2.42 mi15378+2024820+954820+9514640(Top 52%)4558(Top 37%)4558(Top 83%)
30K18.64 mi3.11 mi15104+2744727+934727+9314058(Top 49%)4405(Top 36%)4405(Top 81%)
20M20.00 mi1.36 mi14963+1414674+534674+5313957(Top 49%)4492(Top 37%)4492(Top 82%)
21M21.00 mi1.00 mi14912+514672+24672+214979(Top 53%)5162(Top 42%)5162(Top 94%)
35K21.75 mi0.75 mi14844+684646+264646+2613789(Top 49%)4569(Top 37%)4569(Top 84%)
23M23.00 mi1.25 mi14654+1904577+694577+6912187(Top 43%)3844(Top 31%)3844(Top 70%)
24M24.00 mi1.00 mi14581+734562+154562+1513501(Top 48%)4567(Top 37%)4567(Top 84%)
40K24.85 mi0.85 mi14501+804546+164546+1613576(Top 48%)4742(Top 39%)4742(Top 87%)
25.2M25.20 mi0.35 mi14482+194550-44550-413400(Top 47%)4709(Top 39%)4709(Top 86%)
Finish26.22 mi1.02 mi14346+1364508+424508+4211857(Top 42%)3865(Top 32%)3865(Top 71%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 59%
×21story building
+97ft-345ft

Overall

16672

Females

5541

F18-39

5541

5K→10K

3.1 - 6.2 mi

Top 54%
×5story building
+79ft-138ft

Overall

15305

Females

4725

F18-39

4725

10K→15K

6.2 - 9.3 mi

Top 59%
×3story building
+67ft-78ft

Overall

16672

Females

5541

F18-39

5541

15K→20K

9.3 - 12.4 mi

Top 52%
×5story building
+106ft-86ft

Overall

14849

Females

4562

F18-39

4562

20K→Half

12.4 - 13.1 mi

Top 55%
×2story building
+19ft-37ft

Overall

15641

Females

4961

F18-39

4961

Half→25K

13.1 - 15.5 mi

Top 52%
×4story building
+66ft-88ft

Overall

14640

Females

4558

F18-39

4558

25K→30K

15.5 - 18.6 mi

Top 49%
×9story building
+181ft-148ft

Overall

14058

Females

4405

F18-39

4405

30K→20M

18.6 - 20.0 mi

Top 49%
×5story building
+64ft-50ft

Overall

13957

Females

4492

F18-39

4492

20M→21M

20.0 - 21.0 mi

Top 53%
×8story building
+106ft-24ft

Overall

14979

Females

5162

F18-39

5162

21M→35K

21.0 - 21.8 mi

Top 49%
×7story building
+17ft-86ft

Overall

13789

Females

4569

F18-39

4569

35K→23M

21.8 - 23.0 mi

Top 43%
×5story building
+23ft-63ft

Overall

12187

Females

3844

F18-39

3844

23M→24M

23.0 - 24.0 mi

Top 48%
×6story building
+12ft-82ft

Overall

13501

Females

4567

F18-39

4567

24M→40K

24.0 - 24.9 mi

Top 48%
×1story
+6ft-20ft

Overall

13576

Females

4742

F18-39

4742

40K→25.2M

24.9 - 25.2 mi

Top 47%
×1story
+13ft-16ft

Overall

13400

Females

4709

F18-39

4709

25.2M→Finish

25.2 - 26.2 mi

Top 42%
×2story building
+22ft-21ft

Overall

11857

Females

3865

F18-39

3865

Passing Analysis

Category:
Athletes Passed
2560
Passed By
1347
Net Change
+1213
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15559
5K → 10K386239+147#15559#15412
10K → 15K87536-449#15412#15861
15K → 20K35575+280#15861#15581
20K → Half4140+1#15581#15580
Half → 25K26664+202#15580#15378
25K → 30K36793+274#15378#15104
30K → 20M20463+141#15104#14963
20M → 21M13685+51#14963#14912
21M → 35K9224+68#14912#14844
35K → 23M21525+190#14844#14654
23M → 24M11340+73#14654#14581
24M → 40K10626+80#14581#14501
40K → 25.2M4223+19#14501#14482
25.2M → Finish15014+136#14482#14346
TOTALS25601347+1213
📊

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