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BOSTON MARATHON 2025

Chelsea Dunton

Bib: 19104•F

CA

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 28%
Gender (Female)
#0 / 12228
Top 11%
Division (F18-39)
#0 / 5469
Top 20%
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
7:28/mi
23:11
↑ 97↓ 3451.5%
10K· 6.21 mi
7:25/mi
46:14
↑ 79↓ 1380.4%
15K· 9.32 mi
7:22/mi
1:09:07
↑ 67↓ 78
20K· 12.43 mi
7:21/mi
1:31:57
↑ 106↓ 860.1%
Half· 13.11 mi
7:09/mi
1:36:50
↑ 19↓ 370.5%
25K· 15.53 mi
7:20/mi
1:54:36
↑ 66↓ 880.2%
30K· 18.64 mi
7:34/mi
2:18:06
↑ 181↓ 1480.2%
20M
7:25/mi
2:28:11
↑ 64↓ 500.2%
21M
7:55/mi
2:36:06
↑ 106↓ 241.6%
35K· 21.75 mi
7:16/mi
2:41:32
↑ 17↓ 861.7%
23M
7:11/mi
2:50:32
↑ 23↓ 630.6%
24M
7:00/mi
2:57:32
↓ 821.3%
40K· 24.85 mi
7:02/mi
3:03:33
↓ 200.3%
25.2M
7:56/mi
3:06:17
↑ 13↓ 160.2%
Finish· 26.22 mi
6:50/mi
3:13:15
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:36:50
Pace7:23 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:36:25
Pace7:21 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:13:4923:117:2823:11
7:28
-
10K
6.21 mi11:36:5246:147:2623:03
7:25
-0:03
15K
9.32 mi11:59:451:09:077:2522:53
7:22
-0:03
20K
12.43 mi12:22:351:31:577:2422:50
7:21
-0:01
Half
13.11 mi12:27:281:36:507:234:53
7:09
-0:12
25K
15.53 mi12:45:141:54:367:2317:46
7:20
+0:11
30K
18.64 mi13:08:442:18:067:2523:30
7:34
+0:14
20M
20.00 mi13:18:492:28:117:2510:05
7:25
-0:09
21M
21.00 mi13:26:442:36:067:267:55
7:55
+0:30
35K
21.75 mi13:32:102:41:327:265:26
7:16
-0:39
23M
23.00 mi13:41:102:50:327:259:00
7:11
-0:05
24M
24.00 mi13:48:102:57:327:247:00
7:00
-0:11
40K
24.85 mi13:54:113:03:337:236:01
7:02
+0:02
25.2M
25.20 mi13:56:553:06:177:242:44
7:56
+0:54
Finish
26.22 mi14:03:533:13:157:236:58
6:50
-1:06

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

6:50 /mi

Average Pace

7:23 /mi

Slowest Pace

7:56 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:39:06

82% of race

Time at Steady Pace

34:09

18% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:22 /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 mi11:13:4923:117:2823:11
7:28
#11902
10K
6.21 mi11:36:5246:147:2623:03
7:25
#11624
15K
9.32 mi11:59:451:09:077:2522:53
7:22
#11206
20K
12.43 mi12:22:351:31:577:2422:50
7:21
#10756
Half
13.11 mi12:27:281:36:507:234:53
7:09
#10636
25K
15.53 mi12:45:141:54:367:2317:46
7:20
#10252
30K
18.64 mi13:08:442:18:067:2523:30
7:34
#9773
20M
20.00 mi13:18:492:28:117:2510:05
7:25
#9462
21M
21.00 mi13:26:442:36:067:267:55
7:55
#9255
35K
21.75 mi13:32:102:41:327:265:26
7:16
#9147
23M
23.00 mi13:41:102:50:327:259:00
7:11
#8768
24M
24.00 mi13:48:102:57:327:247:00
7:00
#8495
40K
24.85 mi13:54:113:03:337:236:01
7:02
#8242
25.2M
25.20 mi13:56:553:06:177:242:44
7:56
#8184
Finish
26.22 mi14:03:533:13:157:236:58
6:50
#7990
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi119022737273710542(Top 37%)2132(Top 17%)2132(Top 39%)
10K6.21 mi3.10 mi11624+2782609+1282609+12811357(Top 40%)2488(Top 20%)2488(Top 45%)
15K9.32 mi3.11 mi11206+4182416+1932416+19310542(Top 37%)2132(Top 17%)2132(Top 39%)
20K12.43 mi3.11 mi10756+4502218+1982218+1989459(Top 33%)1712(Top 14%)1712(Top 31%)
Half13.11 mi0.68 mi10636+1202160+582160+588778(Top 31%)1390(Top 11%)1390(Top 25%)
25K15.53 mi2.42 mi10252+3842028+1322028+1328589(Top 30%)1460(Top 12%)1460(Top 27%)
30K18.64 mi3.11 mi9773+4791859+1691859+1698182(Top 29%)1464(Top 12%)1464(Top 27%)
20M20.00 mi1.36 mi9462+3111756+1031756+1036545(Top 23%)989(Top 8%)989(Top 18%)
21M21.00 mi1.00 mi9255+2071689+671689+676911(Top 24%)1269(Top 10%)1269(Top 23%)
35K21.75 mi0.75 mi9147+1081660+291660+297025(Top 25%)1298(Top 11%)1298(Top 24%)
23M23.00 mi1.25 mi8768+3791539+1211539+1214834(Top 17%)632(Top 5%)632(Top 12%)
24M24.00 mi1.00 mi8495+2731465+741465+744679(Top 16%)640(Top 5%)640(Top 12%)
40K24.85 mi0.85 mi8242+2531395+701395+704166(Top 15%)545(Top 4%)545(Top 10%)
25.2M25.20 mi0.35 mi8184+581385+101385+105653(Top 20%)1116(Top 9%)1116(Top 20%)
Finish26.22 mi1.02 mi7990+1941348+371348+374761(Top 17%)786(Top 6%)786(Top 14%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 37%
×21story building
+97ft-345ft

Overall

10542

Females

2132

F18-39

2132

5K→10K

3.1 - 6.2 mi

Top 40%
×5story building
+79ft-138ft

Overall

11357

Females

2488

F18-39

2488

10K→15K

6.2 - 9.3 mi

Top 37%
×3story building
+67ft-78ft

Overall

10542

Females

2132

F18-39

2132

15K→20K

9.3 - 12.4 mi

Top 33%
×5story building
+106ft-86ft

Overall

9459

Females

1712

F18-39

1712

20K→Half

12.4 - 13.1 mi

Top 31%
×2story building
+19ft-37ft

Overall

8778

Females

1390

F18-39

1390

Half→25K

13.1 - 15.5 mi

Top 30%
×4story building
+66ft-88ft

Overall

8589

Females

1460

F18-39

1460

25K→30K

15.5 - 18.6 mi

Top 29%
×9story building
+181ft-148ft

Overall

8182

Females

1464

F18-39

1464

30K→20M

18.6 - 20.0 mi

Top 23%
×5story building
+64ft-50ft

Overall

6545

Females

989

F18-39

989

20M→21M

20.0 - 21.0 mi

Top 24%
×8story building
+106ft-24ft

Overall

6911

Females

1269

F18-39

1269

21M→35K

21.0 - 21.8 mi

Top 25%
×7story building
+17ft-86ft

Overall

7025

Females

1298

F18-39

1298

35K→23M

21.8 - 23.0 mi

Top 17%
×5story building
+23ft-63ft

Overall

4834

Females

632

F18-39

632

23M→24M

23.0 - 24.0 mi

Top 16%
×6story building
+12ft-82ft

Overall

4679

Females

640

F18-39

640

24M→40K

24.0 - 24.9 mi

Top 15%
×1story
+6ft-20ft

Overall

4166

Females

545

F18-39

545

40K→25.2M

24.9 - 25.2 mi

Top 20%
×1story
+13ft-16ft

Overall

5653

Females

1116

F18-39

1116

25.2M→Finish

25.2 - 26.2 mi

Top 17%
×2story building
+22ft-21ft

Overall

4761

Females

786

F18-39

786

Passing Analysis

Category:
Athletes Passed
4183*
Passed By
271
Net Change
+3912
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11902
5K → 10K420142+278#11902#11624
10K → 15K45335+418#11624#11206
15K → 20K46616+450#11206#10756
20K → Half1200+120#10756#10636
Half → 25K39612+384#10636#10252
25K → 30K506*27+479#10252#9773
30K → 20M3121+311#9773#9462
20M → 21M22013+207#9462#9255
21M → 35K1146+108#9255#9147
35K → 23M3812+379#9147#8768
23M → 24M2730+273#8768#8495
24M → 40K2541+253#8495#8242
40K → 25.2M624+58#8242#8184
25.2M → Finish20612+194#8184#7990
TOTALS4183*271+3912

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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