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BOSTON MARATHON 2025

Emma Alonso

Bib: 19319•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 39%
Masters (Masters Women)
#0 / 6759
Top 25%
Division (F40-44)
#0 / 1718
Top 48%
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
8:21/mi
25:57
↑ 97↓ 3451.5%
10K· 6.21 mi
8:03/mi
50:57
↑ 79↓ 1380.4%
15K· 9.32 mi
7:58/mi
1:15:41
↑ 67↓ 78
20K· 12.43 mi
8:01/mi
1:40:36
↑ 106↓ 860.1%
Half· 13.11 mi
7:55/mi
1:46:00
↑ 19↓ 370.5%
25K· 15.53 mi
7:58/mi
2:05:19
↑ 66↓ 880.2%
30K· 18.64 mi
8:06/mi
2:30:30
↑ 181↓ 1480.2%
20M
8:19/mi
2:41:48
↑ 64↓ 500.2%
21M
8:59/mi
2:50:47
↑ 106↓ 241.6%
35K· 21.75 mi
8:01/mi
2:56:47
↑ 17↓ 861.7%
23M
8:21/mi
3:07:14
↑ 23↓ 630.6%
24M
8:38/mi
3:15:52
↓ 821.3%
40K· 24.85 mi
9:00/mi
3:23:34
↓ 200.3%
25.2M
10:03/mi
3:27:02
↑ 13↓ 160.2%
Finish· 26.22 mi
8:40/mi
3:35:52
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:46:00
Pace8:05 /mi
2nd Half
Distance13.11 mi
Time1:49:52
Pace8:23 /mi
📊Positive Split: 3.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:18:1925:578:2125:57
8:21
-
10K
6.21 mi11:43:1950:578:1225:00
8:03
-0:18
15K
9.32 mi12:08:031:15:418:0724:44
7:58
-0:05
20K
12.43 mi12:32:581:40:368:0624:55
8:01
+0:03
Half
13.11 mi12:38:221:46:008:055:24
7:55
-0:06
25K
15.53 mi12:57:412:05:198:0419:19
7:58
+0:03
30K
18.64 mi13:22:522:30:308:0425:11
8:06
+0:08
20M
20.00 mi13:34:102:41:488:0511:18
8:19
+0:13
21M
21.00 mi13:43:092:50:478:088:59
8:59
+0:40
35K
21.75 mi13:49:092:56:478:086:00
8:01
-0:58
23M
23.00 mi13:59:363:07:148:0810:27
8:21
+0:20
24M
24.00 mi14:08:143:15:528:108:38
8:38
+0:17
40K
24.85 mi14:15:563:23:348:117:42
9:00
+0:22
25.2M
25.20 mi14:19:243:27:028:133:28
10:03
+1:03
Finish
26.22 mi14:28:143:35:528:148:50
8:40
-1:23

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

8:14 /mi

Slowest Pace

10:03 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:20:22

37% of race

Time at Steady Pace

1:37:53

45% of race

Time at Slower Pace

37:37

17% of race

Average Pace: 8:14 /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 mi11:18:1925:578:2125:57
8:21
#19037
10K
6.21 mi11:43:1950:578:1225:00
8:03
#17979
15K
9.32 mi12:08:031:15:418:0724:44
7:58
#17229
20K
12.43 mi12:32:581:40:368:0624:55
8:01
#16646
Half
13.11 mi12:38:221:46:008:055:24
7:55
#16570
25K
15.53 mi12:57:412:05:198:0419:19
7:58
#16083
30K
18.64 mi13:22:522:30:308:0425:11
8:06
#15316
20M
20.00 mi13:34:102:41:488:0511:18
8:19
#15059
21M
21.00 mi13:43:092:50:478:088:59
8:59
#14900
35K
21.75 mi13:49:092:56:478:086:00
8:01
#14773
23M
23.00 mi13:59:363:07:148:0810:27
8:21
#14608
24M
24.00 mi14:08:143:15:528:108:38
8:38
#14621
40K
24.85 mi14:15:563:23:348:117:42
9:00
#14670
25.2M
25.20 mi14:19:243:27:028:133:28
10:03
#14709
Finish
26.22 mi14:28:143:35:528:148:50
8:40
#14792
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi190376928692815756(Top 55%)5005(Top 41%)5005(Top 291%)
10K6.21 mi3.10 mi17979+10586311+6176311+61716827(Top 59%)5604(Top 46%)5604(Top 326%)
15K9.32 mi3.11 mi17229+7505847+4645847+46415756(Top 55%)5005(Top 41%)5005(Top 291%)
20K12.43 mi3.11 mi16646+5835529+3185529+31815094(Top 53%)4692(Top 38%)4692(Top 273%)
Half13.11 mi0.68 mi16570+765482+475482+4715282(Top 54%)4779(Top 39%)4779(Top 278%)
25K15.53 mi2.42 mi16083+4875210+2725210+27213652(Top 48%)4038(Top 33%)4038(Top 235%)
30K18.64 mi3.11 mi15316+7674833+3774833+37712159(Top 43%)3373(Top 28%)3373(Top 196%)
20M20.00 mi1.36 mi15059+2574735+984735+9812625(Top 44%)3772(Top 31%)3772(Top 220%)
21M21.00 mi1.00 mi14900+1594665+704665+7013426(Top 47%)4332(Top 35%)4332(Top 252%)
35K21.75 mi0.75 mi14773+1274614+514614+5112452(Top 44%)3887(Top 32%)3887(Top 226%)
23M23.00 mi1.25 mi14608+1654552+624552+6212354(Top 43%)3937(Top 32%)3937(Top 229%)
24M24.00 mi1.00 mi14621-134584-324584-3215366(Top 54%)5577(Top 46%)5577(Top 325%)
40K24.85 mi0.85 mi14670-494641-574641-5716346(Top 58%)6223(Top 51%)6223(Top 362%)
25.2M25.20 mi0.35 mi14709-394676-354676-3517275(Top 61%)6725(Top 55%)6725(Top 391%)
Finish26.22 mi1.02 mi14792-834754-784754-7817287(Top 61%)6690(Top 55%)6690(Top 389%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 55%
×21story building
+97ft-345ft

Overall

15756

Females

5005

F40-44

5005

5K→10K

3.1 - 6.2 mi

Top 59%
×5story building
+79ft-138ft

Overall

16827

Females

5604

F40-44

5604

10K→15K

6.2 - 9.3 mi

Top 55%
×3story building
+67ft-78ft

Overall

15756

Females

5005

F40-44

5005

15K→20K

9.3 - 12.4 mi

Top 53%
×5story building
+106ft-86ft

Overall

15094

Females

4692

F40-44

4692

20K→Half

12.4 - 13.1 mi

Top 54%
×2story building
+19ft-37ft

Overall

15282

Females

4779

F40-44

4779

Half→25K

13.1 - 15.5 mi

Top 48%
×4story building
+66ft-88ft

Overall

13652

Females

4038

F40-44

4038

25K→30K

15.5 - 18.6 mi

Top 43%
×9story building
+181ft-148ft

Overall

12159

Females

3373

F40-44

3373

30K→20M

18.6 - 20.0 mi

Top 44%
×5story building
+64ft-50ft

Overall

12625

Females

3772

F40-44

3772

20M→21M

20.0 - 21.0 mi

Top 47%
×8story building
+106ft-24ft

Overall

13426

Females

4332

F40-44

4332

21M→35K

21.0 - 21.8 mi

Top 44%
×7story building
+17ft-86ft

Overall

12452

Females

3887

F40-44

3887

35K→23M

21.8 - 23.0 mi

Top 43%
×5story building
+23ft-63ft

Overall

12354

Females

3937

F40-44

3937

23M→24M

23.0 - 24.0 mi

Top 54%
×6story building
+12ft-82ft

Overall

15366

Females

5577

F40-44

5577

24M→40K

24.0 - 24.9 mi

Top 58%
×1story
+6ft-20ft

Overall

16346

Females

6223

F40-44

6223

40K→25.2M

24.9 - 25.2 mi

Top 61%
×1story
+13ft-16ft

Overall

17275

Females

6725

F40-44

6725

25.2M→Finish

25.2 - 26.2 mi

Top 61%
×2story building
+22ft-21ft

Overall

17287

Females

6690

F40-44

6690

Passing Analysis

Category:
Athletes Passed
4791
Passed By
546
Net Change
+4245
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19037
5K → 10K109335+1058#19037#17979
10K → 15K76515+750#17979#17229
15K → 20K59411+583#17229#16646
20K → Half804+76#16646#16570
Half → 25K4925+487#16570#16083
25K → 30K7725+767#16083#15316
30K → 20M26912+257#15316#15059
20M → 21M20142+159#15059#14900
21M → 35K1325+127#14900#14773
35K → 23M19227+165#14773#14608
23M → 24M6780-13#14608#14621
24M → 40K58107-49#14621#14670
40K → 25.2M2564-39#14670#14709
25.2M → Finish51134-83#14709#14792
TOTALS4791546+4245
📊

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