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BOSTON MARATHON 2025

Chelsea Zaloumis

ID

Bib: 15373 F

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 49%
Gender (Female)
#0 / 12228
Top 35%
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
7:43/mi
24:00
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:55/mi
48:36
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:56/mi
1:13:16
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:59/mi
1:38:04
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
8:05/mi
1:43:35
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:14/mi
2:03:32
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:22/mi
2:29:31
↑ 181↓ 1480.2%
138 ft elev
20M
8:29/mi
2:41:03
↑ 64↓ 500.2%
148 ft elev
21M
8:56/mi
2:49:59
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:01/mi
2:55:59
↑ 17↓ 861.7%
156 ft elev
23M
8:23/mi
3:06:29
↑ 23↓ 630.6%
116 ft elev
24M
8:11/mi
3:14:40
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:14/mi
3:21:42
↓ 200.3%
20 ft elev
25.2M
8:39/mi
3:24:41
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
7:29/mi
3:32:19
↑ 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
Time1:43:35
Pace7:54 /mi
2nd Half
Distance13.11 mi
Time1:48:44
Pace8:18 /mi
📊Positive Split: 5.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:56:1224:007:4324:00
7:43
-
10K
6.21 mi11:20:4848:367:4924:36
7:55
+0:12
15K
9.32 mi11:45:281:13:167:5224:40
7:56
+0:01
20K
12.43 mi12:10:161:38:047:5324:48
7:59
+0:03
Half
13.11 mi12:15:471:43:357:545:31
8:05
+0:06
25K
15.53 mi12:35:442:03:327:5719:57
8:14
+0:09
30K
18.64 mi13:01:432:29:318:0125:59
8:22
+0:08
20M
20.00 mi13:13:152:41:038:0311:32
8:29
+0:07
21M
21.00 mi13:22:112:49:598:068:56
8:56
+0:27
35K
21.75 mi13:28:112:55:598:066:00
8:01
-0:55
23M
23.00 mi13:38:413:06:298:0610:30
8:23
+0:22
24M
24.00 mi13:46:523:14:408:078:11
8:11
-0:12
40K
24.85 mi13:53:543:21:428:077:02
8:14
+0:03
25.2M
25.20 mi13:56:533:24:418:072:59
8:39
+0:25
Finish
26.22 mi14:04:313:32:198:067:38
7:29
-1:10

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

7:29 /mi

Average Pace

8:06 /mi

Slowest Pace

8:56 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:05:24

59% of race

Time at Steady Pace

1:17:59

37% of race

Time at Slower Pace

8:56

4% of race

Average Pace: 8:06 /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 mi10:56:1224:007:4324:00
7:43
#14189
10K
6.21 mi11:20:4848:367:4924:36
7:55
#14963
15K
9.32 mi11:45:281:13:167:5224:40
7:56
#15175
20K
12.43 mi12:10:161:38:047:5324:48
7:59
#15018
Half
13.11 mi12:15:471:43:357:545:31
8:05
#15106
25K
15.53 mi12:35:442:03:327:5719:57
8:14
#15176
30K
18.64 mi13:01:432:29:318:0125:59
8:22
#14906
20M
20.00 mi13:13:152:41:038:0311:32
8:29
#14771
21M
21.00 mi13:22:112:49:598:068:56
8:56
#14642
35K
21.75 mi13:28:112:55:598:066:00
8:01
#14518
23M
23.00 mi13:38:413:06:298:0610:30
8:23
#14386
24M
24.00 mi13:46:523:14:408:078:11
8:11
#14280
40K
24.85 mi13:53:543:21:428:077:02
8:14
#14157
25.2M
25.20 mi13:56:533:24:418:072:59
8:39
#14069
Finish
26.22 mi14:04:313:32:198:067:38
7:29
#13840
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi141894025402515576(Top 55%)4893(Top 40%)4893(Top 89%)
10K6.21 mi3.10 mi14963-7744527-5024527-50215812(Top 56%)5017(Top 41%)5017(Top 92%)
15K9.32 mi3.11 mi15175-2124665-1384665-13815576(Top 55%)4893(Top 40%)4893(Top 89%)
20K12.43 mi3.11 mi15018+1574595+704595+7014800(Top 52%)4530(Top 37%)4530(Top 83%)
Half13.11 mi0.68 mi15106-884644-494644-4916528(Top 58%)5474(Top 45%)5474(Top 100%)
25K15.53 mi2.42 mi15176-704708-644708-6415478(Top 54%)5004(Top 41%)5004(Top 91%)
30K18.64 mi3.11 mi14906+2704619+894619+8913922(Top 49%)4320(Top 35%)4320(Top 79%)
20M20.00 mi1.36 mi14771+1354564+554564+5513711(Top 48%)4360(Top 36%)4360(Top 80%)
21M21.00 mi1.00 mi14642+1294523+414523+4113146(Top 46%)4191(Top 34%)4191(Top 77%)
35K21.75 mi0.75 mi14518+1244464+594464+5912441(Top 44%)3876(Top 32%)3876(Top 71%)
23M23.00 mi1.25 mi14386+1324428+364428+3612609(Top 44%)4058(Top 33%)4058(Top 74%)
24M24.00 mi1.00 mi14280+1064399+294399+2912488(Top 44%)4042(Top 33%)4042(Top 74%)
40K24.85 mi0.85 mi14157+1234366+334366+3311751(Top 41%)3786(Top 31%)3786(Top 69%)
25.2M25.20 mi0.35 mi14069+884329+374329+379833(Top 35%)2959(Top 24%)2959(Top 54%)
Finish26.22 mi1.02 mi13840+2294234+954234+959159(Top 32%)2616(Top 21%)2616(Top 48%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 55%
×21story building
+97ft-345ft

Overall

15576

Females

4893

F18-39

4893

5K→10K

3.1 - 6.2 mi

Top 56%
×5story building
+79ft-138ft

Overall

15812

Females

5017

F18-39

5017

10K→15K

6.2 - 9.3 mi

Top 55%
×3story building
+67ft-78ft

Overall

15576

Females

4893

F18-39

4893

15K→20K

9.3 - 12.4 mi

Top 52%
×5story building
+106ft-86ft

Overall

14800

Females

4530

F18-39

4530

20K→Half

12.4 - 13.1 mi

Top 58%
×2story building
+19ft-37ft

Overall

16528

Females

5474

F18-39

5474

Half→25K

13.1 - 15.5 mi

Top 54%
×4story building
+66ft-88ft

Overall

15478

Females

5004

F18-39

5004

25K→30K

15.5 - 18.6 mi

Top 49%
×9story building
+181ft-148ft

Overall

13922

Females

4320

F18-39

4320

30K→20M

18.6 - 20.0 mi

Top 48%
×5story building
+64ft-50ft

Overall

13711

Females

4360

F18-39

4360

20M→21M

20.0 - 21.0 mi

Top 46%
×8story building
+106ft-24ft

Overall

13146

Females

4191

F18-39

4191

21M→35K

21.0 - 21.8 mi

Top 44%
×7story building
+17ft-86ft

Overall

12441

Females

3876

F18-39

3876

35K→23M

21.8 - 23.0 mi

Top 44%
×5story building
+23ft-63ft

Overall

12609

Females

4058

F18-39

4058

23M→24M

23.0 - 24.0 mi

Top 44%
×6story building
+12ft-82ft

Overall

12488

Females

4042

F18-39

4042

24M→40K

24.0 - 24.9 mi

Top 41%
×1story
+6ft-20ft

Overall

11751

Females

3786

F18-39

3786

40K→25.2M

24.9 - 25.2 mi

Top 35%
×1story
+13ft-16ft

Overall

9833

Females

2959

F18-39

2959

25.2M→Finish

25.2 - 26.2 mi

Top 32%
×2story building
+22ft-21ft

Overall

9159

Females

2616

F18-39

2616

Passing Analysis

Category:
Athletes Passed
2335
Passed By
1986
Net Change
+349
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#14189
5K → 10K94868-774#14189#14963
10K → 15K143355-212#14963#15175
15K → 20K286129+157#15175#15018
20K → Half19107-88#15018#15106
Half → 25K149219-70#15106#15176
25K → 30K385115+270#15176#14906
30K → 20M18752+135#14906#14771
20M → 21M17748+129#14771#14642
21M → 35K13814+124#14642#14518
35K → 23M16533+132#14518#14386
23M → 24M12822+106#14386#14280
24M → 40K13815+123#14280#14157
40K → 25.2M935+88#14157#14069
25.2M → Finish2334+229#14069#13840
TOTALS23351986+349
📊

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