Boston Marathon logo
BOSTON MARATHON 2025

Sierra Lee

Bib: 12707•F

NS

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 20%
Gender (Female)
#0 / 12228
Top 5%
Division (F18-39)
#0 / 5469
Top 9%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:13
Rank: #6574
Start → 5K
6:50/mi
21:13 split
10K· 6.21 mi
42:24
Rank: #6531 (+43)
5K → 10K
6:49/mi
21:11 split
15K· 9.32 mi
1:03:42
Rank: #6523 (+8)
10K → 15K
6:51/mi
21:18 split
20K· 12.43 mi
1:24:56
Rank: #6270 (+253)
15K → 20K
6:50/mi
21:14 split
Half· 13.11 mi
1:29:33
Rank: #6246 (+24)
20K → Half
6:46/mi
4:37 split
25K· 15.53 mi
1:46:13
Rank: #6051 (+195)
Half → 25K
6:52/mi
16:40 split
30K· 18.64 mi
2:08:06
Rank: #5764 (+287)
25K → 30K
7:03/mi
21:53 split
20M
2:17:47
Rank: #5669 (+95)
30K → 20M
7:08/mi
9:41 split
21M
2:25:24
Rank: #5607 (+62)
20M → 21M
7:37/mi
7:37 split
35K· 21.75 mi
2:30:35
Rank: #5564 (+43)
21M → 35K
6:56/mi
5:11 split
23M
2:39:57
Rank: #5533 (+31)
35K → 23M
7:29/mi
9:22 split
24M
2:47:34
Rank: #5581 (-48)
23M → 24M
7:37/mi
7:37 split
40K· 24.85 mi
2:54:06
Rank: #5597 (-16)
24M → 40K
7:38/mi
6:32 split
25.2M
2:56:53
Rank: #5575 (+22)
40K → 25.2M
8:04/mi
2:47 split
Finish· 26.22 mi
3:04:19
Rank: #5597 (-22)
25.2M → Finish
7:18/mi
7:26 split

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:29:33
Pace6:50 /mi
2nd Half
Distance13.11 mi
Time1:34:46
Pace7:14 /mi
📊Positive Split: 5.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:48:1321:136:5021:13
6:50
-
10K
6.21 mi11:09:2442:246:4921:11
6:49
-0:01
15K
9.32 mi11:30:421:03:426:5021:18
6:51
+0:02
20K
12.43 mi11:51:561:24:566:5021:14
6:50
-0:01
Half
13.11 mi11:56:331:29:336:504:37
6:46
-0:04
25K
15.53 mi12:13:131:46:136:5016:40
6:52
+0:06
30K
18.64 mi12:35:062:08:066:5221:53
7:03
+0:11
20M
20.00 mi12:44:472:17:476:539:41
7:08
+0:05
21M
21.00 mi12:52:242:25:246:557:37
7:37
+0:29
35K
21.75 mi12:57:352:30:356:555:11
6:56
-0:41
23M
23.00 mi13:06:572:39:576:579:22
7:29
+0:33
24M
24.00 mi13:14:342:47:346:597:37
7:37
+0:08
40K
24.85 mi13:21:062:54:067:006:32
7:38
+0:01
25.2M
25.20 mi13:23:532:56:537:012:47
8:04
+0:26
Finish
26.22 mi13:31:193:04:197:027:26
7:18
-0:46

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

6:46 /mi

Average Pace

7:02 /mi

Slowest Pace

8:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:30:24

82% of race

Time at Steady Pace

31:08

17% of race

Time at Slower Pace

2:47

2% of race

Average Pace: 7:02 /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 mi10:48:1321:136:5021:13
6:50
#6574
10K
6.21 mi11:09:2442:246:4921:11
6:49
#6531
15K
9.32 mi11:30:421:03:426:5021:18
6:51
#6523
20K
12.43 mi11:51:561:24:566:5021:14
6:50
#6270
Half
13.11 mi11:56:331:29:336:504:37
6:46
#6246
25K
15.53 mi12:13:131:46:136:5016:40
6:52
#6051
30K
18.64 mi12:35:062:08:066:5221:53
7:03
#5764
20M
20.00 mi12:44:472:17:476:539:41
7:08
#5669
21M
21.00 mi12:52:242:25:246:557:37
7:37
#5607
35K
21.75 mi12:57:352:30:356:555:11
6:56
#5564
23M
23.00 mi13:06:572:39:576:579:22
7:29
#5533
24M
24.00 mi13:14:342:47:346:597:37
7:37
#5581
40K
24.85 mi13:21:062:54:067:006:32
7:38
#5597
25.2M
25.20 mi13:23:532:56:537:012:47
8:04
#5575
Finish
26.22 mi13:31:193:04:197:027:26
7:18
#5597
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi65745855856661(Top 23%)648(Top 5%)648(Top 12%)
10K6.21 mi3.10 mi6531+43580+5580+56615(Top 23%)622(Top 5%)622(Top 11%)
15K9.32 mi3.11 mi6523+8607-27607-276661(Top 23%)648(Top 5%)648(Top 12%)
20K12.43 mi3.11 mi6270+253561+46561+465664(Top 20%)486(Top 4%)486(Top 9%)
Half13.11 mi0.68 mi6246+245615615943(Top 21%)541(Top 4%)541(Top 10%)
25K15.53 mi2.42 mi6051+195539+22539+225484(Top 19%)489(Top 4%)489(Top 9%)
30K18.64 mi3.11 mi5764+287504+35504+354977(Top 18%)446(Top 4%)446(Top 8%)
20M20.00 mi1.36 mi5669+95488+16488+164833(Top 17%)467(Top 4%)467(Top 9%)
21M21.00 mi1.00 mi5607+62487+1487+15238(Top 18%)670(Top 5%)670(Top 12%)
35K21.75 mi0.75 mi5564+43489-2489-24965(Top 17%)596(Top 5%)596(Top 11%)
23M23.00 mi1.25 mi5533+31499-10499-106536(Top 23%)1201(Top 10%)1201(Top 22%)
24M24.00 mi1.00 mi5581-48528-29528-298537(Top 30%)2099(Top 17%)2099(Top 38%)
40K24.85 mi0.85 mi5597-16544-16544-167716(Top 27%)1842(Top 15%)1842(Top 34%)
25.2M25.20 mi0.35 mi5575+22547-3547-36353(Top 22%)1356(Top 11%)1356(Top 25%)
Finish26.22 mi1.02 mi5597-22568-21568-217751(Top 27%)1949(Top 16%)1949(Top 36%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 23%
×21story building
+97ft-345ft

Overall

6661

Females

648

F18-39

648

5K→10K

3.1 - 6.2 mi

Top 23%
×5story building
+79ft-138ft

Overall

6615

Females

622

F18-39

622

10K→15K

6.2 - 9.3 mi

Top 23%
×3story building
+67ft-78ft

Overall

6661

Females

648

F18-39

648

15K→20K

9.3 - 12.4 mi

Top 20%
×5story building
+106ft-86ft

Overall

5664

Females

486

F18-39

486

20K→Half

12.4 - 13.1 mi

Top 21%
×2story building
+19ft-37ft

Overall

5943

Females

541

F18-39

541

Half→25K

13.1 - 15.5 mi

Top 19%
×4story building
+66ft-88ft

Overall

5484

Females

489

F18-39

489

25K→30K

15.5 - 18.6 mi

Top 18%
×9story building
+181ft-148ft

Overall

4977

Females

446

F18-39

446

30K→20M

18.6 - 20.0 mi

Top 17%
×5story building
+64ft-50ft

Overall

4833

Females

467

F18-39

467

20M→21M

20.0 - 21.0 mi

Top 18%
×8story building
+106ft-24ft

Overall

5238

Females

670

F18-39

670

21M→35K

21.0 - 21.8 mi

Top 17%
×7story building
+17ft-86ft

Overall

4965

Females

596

F18-39

596

35K→23M

21.8 - 23.0 mi

Top 23%
×5story building
+23ft-63ft

Overall

6536

Females

1201

F18-39

1201

23M→24M

23.0 - 24.0 mi

Top 30%
×6story building
+12ft-82ft

Overall

8537

Females

2099

F18-39

2099

24M→40K

24.0 - 24.9 mi

Top 27%
×1story
+6ft-20ft

Overall

7716

Females

1842

F18-39

1842

40K→25.2M

24.9 - 25.2 mi

Top 22%
×1story
+13ft-16ft

Overall

6353

Females

1356

F18-39

1356

25.2M→Finish

25.2 - 26.2 mi

Top 27%
×2story building
+22ft-21ft

Overall

7751

Females

1949

F18-39

1949

Passing Analysis

Category:
Athletes Passed
1779
Passed By
802
Net Change
+977
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#6574
5K → 10K207164+43#6574#6531
10K → 15K165157+8#6531#6523
15K → 20K27421+253#6523#6270
20K → Half4016+24#6270#6246
Half → 25K21924+195#6246#6051
25K → 30K33750+287#6051#5764
30K → 20M12025+95#5764#5669
20M → 21M9937+62#5669#5607
21M → 35K5512+43#5607#5564
35K → 23M9867+31#5564#5533
23M → 24M4189-48#5533#5581
24M → 40K4561-16#5581#5597
40K → 25.2M3614+22#5597#5575
25.2M → Finish4365-22#5575#5597
TOTALS1779802+977
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing