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BOSTON MARATHON 2025

Kelsey Low

Bib: 27774•F

MA

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
9:05/mi
28:12
↑ 97↓ 3451.5%
10K· 6.21 mi
9:07/mi
56:33
↑ 79↓ 1380.4%
15K· 9.32 mi
9:43/mi
1:26:43
↑ 67↓ 78
20K· 12.43 mi
10:04/mi
1:57:59
↑ 106↓ 860.1%
Half· 13.11 mi
9:32/mi
2:04:29
↑ 19↓ 370.5%
25K· 15.53 mi
10:26/mi
2:29:46
↑ 66↓ 880.2%
30K· 18.64 mi
10:38/mi
3:02:48
↑ 181↓ 1480.2%
20M
10:49/mi
3:17:30
↑ 64↓ 500.2%
21M
12:01/mi
3:29:31
↑ 106↓ 241.6%
35K· 21.75 mi
11:22/mi
3:38:01
↑ 17↓ 861.7%
23M
10:57/mi
3:51:43
↑ 23↓ 630.6%
24M
10:49/mi
4:02:32
↓ 821.3%
40K· 24.85 mi
9:48/mi
4:10:55
↓ 200.3%
25.2M
10:06/mi
4:14:24
↑ 13↓ 160.2%
Finish· 26.22 mi
9:32/mi
4:24:07
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:04:29
Pace9:30 /mi
2nd Half
Distance13.11 mi
Time2:19:38
Pace10:39 /mi
📊Positive Split: 12.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:48:1328:129:0528:12
9:05
-
10K
6.21 mi12:16:3456:339:0628:21
9:07
+0:02
15K
9.32 mi12:46:441:26:439:1830:10
9:43
+0:36
20K
12.43 mi13:18:001:57:599:3031:16
10:04
+0:21
Half
13.11 mi13:24:302:04:299:306:30
9:32
-0:32
25K
15.53 mi13:49:472:29:469:3825:17
10:26
+0:54
30K
18.64 mi14:22:493:02:489:4833:02
10:38
+0:12
20M
20.00 mi14:37:313:17:309:5214:42
10:49
+0:11
21M
21.00 mi14:49:323:29:319:5912:01
12:01
+1:12
35K
21.75 mi14:58:023:38:0110:018:30
11:22
-0:39
23M
23.00 mi15:11:443:51:4310:0413:42
10:57
-0:25
24M
24.00 mi15:22:334:02:3210:0610:49
10:49
-0:08
40K
24.85 mi15:30:564:10:5510:068:23
9:48
-1:01
25.2M
25.20 mi15:34:254:14:2410:063:29
10:06
+0:18
Finish
26.22 mi15:44:084:24:0710:059:43
9:32
-0:34

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

9:05 /mi

Average Pace

10:05 /mi

Slowest Pace

12:01 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:12:46

28% of race

Time at Steady Pace

1:38:35

37% of race

Time at Slower Pace

1:32:46

35% of race

Average Pace: 10:04 /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 mi11:48:1328:129:0528:12
9:05
#22769
10K
6.21 mi12:16:3456:339:0628:21
9:07
#22818
15K
9.32 mi12:46:441:26:439:1830:10
9:43
#23459
20K
12.43 mi13:18:001:57:599:3031:16
10:04
#23737
Half
13.11 mi13:24:302:04:299:306:30
9:32
#23728
25K
15.53 mi13:49:472:29:469:3825:17
10:26
#23806
30K
18.64 mi14:22:493:02:489:4833:02
10:38
#23691
20M
20.00 mi14:37:313:17:309:5214:42
10:49
#23655
21M
21.00 mi14:49:323:29:319:5912:01
12:01
#23663
35K
21.75 mi14:58:023:38:0110:018:30
11:22
#23727
23M
23.00 mi15:11:443:51:4310:0413:42
10:57
#23673
24M
24.00 mi15:22:334:02:3210:0610:49
10:49
#23687
40K
24.85 mi15:30:564:10:5510:068:23
9:48
#23560
25.2M
25.20 mi15:34:254:14:2410:063:29
10:06
#23461
Finish
26.22 mi15:44:084:24:0710:059:43
9:32
#23403
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi227699054905424323(Top 86%)9855(Top 81%)9855(Top 180%)
10K6.21 mi3.10 mi22818-499057-39057-322919(Top 81%)9085(Top 74%)9085(Top 166%)
15K9.32 mi3.11 mi23459-6419389-3329389-33224323(Top 86%)9855(Top 81%)9855(Top 180%)
20K12.43 mi3.11 mi23737-2789540-1519540-15124373(Top 86%)9919(Top 81%)9919(Top 181%)
Half13.11 mi0.68 mi23728+99537+39537+323657(Top 83%)9518(Top 78%)9518(Top 174%)
25K15.53 mi2.42 mi23806-789587-509587-5024235(Top 85%)9870(Top 81%)9870(Top 180%)
30K18.64 mi3.11 mi23691+1159568+199568+1923237(Top 82%)9456(Top 77%)9456(Top 173%)
20M20.00 mi1.36 mi23655+369576-89576-823218(Top 82%)9539(Top 78%)9539(Top 174%)
21M21.00 mi1.00 mi23663-89589-139589-1323633(Top 83%)9832(Top 80%)9832(Top 180%)
35K21.75 mi0.75 mi23727-649627-389627-3824882(Top 88%)10521(Top 86%)10521(Top 192%)
23M23.00 mi1.25 mi23673+549619+89619+823104(Top 81%)9660(Top 79%)9660(Top 177%)
24M24.00 mi1.00 mi23687-149642-239642-2323606(Top 83%)9930(Top 81%)9930(Top 182%)
40K24.85 mi0.85 mi23560+1279596+469596+4619859(Top 70%)8083(Top 66%)8083(Top 148%)
25.2M25.20 mi0.35 mi23461+999548+489548+4817574(Top 62%)6928(Top 57%)6928(Top 127%)
Finish26.22 mi1.02 mi23403+589536+129536+1221324(Top 75%)8831(Top 72%)8831(Top 161%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 86%
×21story building
+97ft-345ft

Overall

24323

Females

9855

F18-39

9855

5K→10K

3.1 - 6.2 mi

Top 81%
×5story building
+79ft-138ft

Overall

22919

Females

9085

F18-39

9085

10K→15K

6.2 - 9.3 mi

Top 86%
×3story building
+67ft-78ft

Overall

24323

Females

9855

F18-39

9855

15K→20K

9.3 - 12.4 mi

Top 86%
×5story building
+106ft-86ft

Overall

24373

Females

9919

F18-39

9919

20K→Half

12.4 - 13.1 mi

Top 83%
×2story building
+19ft-37ft

Overall

23657

Females

9518

F18-39

9518

Half→25K

13.1 - 15.5 mi

Top 85%
×4story building
+66ft-88ft

Overall

24235

Females

9870

F18-39

9870

25K→30K

15.5 - 18.6 mi

Top 82%
×9story building
+181ft-148ft

Overall

23237

Females

9456

F18-39

9456

30K→20M

18.6 - 20.0 mi

Top 82%
×5story building
+64ft-50ft

Overall

23218

Females

9539

F18-39

9539

20M→21M

20.0 - 21.0 mi

Top 83%
×8story building
+106ft-24ft

Overall

23633

Females

9832

F18-39

9832

21M→35K

21.0 - 21.8 mi

Top 88%
×7story building
+17ft-86ft

Overall

24882

Females

10521

F18-39

10521

35K→23M

21.8 - 23.0 mi

Top 81%
×5story building
+23ft-63ft

Overall

23104

Females

9660

F18-39

9660

23M→24M

23.0 - 24.0 mi

Top 83%
×6story building
+12ft-82ft

Overall

23606

Females

9930

F18-39

9930

24M→40K

24.0 - 24.9 mi

Top 70%
×1story
+6ft-20ft

Overall

19859

Females

8083

F18-39

8083

40K→25.2M

24.9 - 25.2 mi

Top 62%
×1story
+13ft-16ft

Overall

17574

Females

6928

F18-39

6928

25.2M→Finish

25.2 - 26.2 mi

Top 75%
×2story building
+22ft-21ft

Overall

21324

Females

8831

F18-39

8831

Passing Analysis

Category:
Athletes Passed
1280
Passed By
1914
Net Change
-634
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22769
5K → 10K224273-49#22769#22818
10K → 15K41682-641#22818#23459
15K → 20K72350-278#23459#23737
20K → Half2213+9#23737#23728
Half → 25K93171-78#23728#23806
25K → 30K21499+115#23806#23691
30K → 20M8852+36#23691#23655
20M → 21M6674-8#23655#23663
21M → 35K2589-64#23663#23727
35K → 23M9036+54#23727#23673
23M → 24M3953-14#23673#23687
24M → 40K1325+127#23687#23560
40K → 25.2M990+99#23560#23461
25.2M → Finish7517+58#23461#23403
TOTALS12801914-634
📊

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