Boston Marathon logo
BOSTON MARATHON 2025

Emmie Costen

Bib: 8801•F

NC

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 12%
Gender (Female)
#0 / 12228
Top 2%
Division (F18-39)
#0 / 5469
Top 3%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:20
Rank: #4174
Start → 5K
20:20 | 6:33/mi
10K· 6.21 mi
39:53
Rank: #3200 (+974)
5K → 10K
19:33 | 6:18/mi
15K· 9.32 mi
59:33
Rank: #2934 (+266)
10K → 15K
19:40 | 6:20/mi
20K· 12.43 mi
1:19:22
Rank: #2782 (+152)
15K → 20K
19:49 | 6:23/mi
Half· 13.11 mi
1:23:40
Rank: #2756 (+26)
20K → Half
4:18 | 6:18/mi
25K· 15.53 mi
1:39:12
Rank: #2665 (+91)
Half → 25K
15:32 | 6:24/mi
30K· 18.64 mi
1:59:51
Rank: #2606 (+59)
25K → 30K
20:39 | 6:39/mi
20M
2:09:04
Rank: #2594 (+12)
30K → 20M
9:13 | 6:47/mi
21M
2:16:19
Rank: #2618 (-24)
20M → 21M
7:15 | 7:15/mi
35K· 21.75 mi
2:21:24
Rank: #2657 (-39)
21M → 35K
5:05 | 6:48/mi
23M
2:30:18
Rank: #2713 (-56)
35K → 23M
8:54 | 7:06/mi
24M
2:37:38
Rank: #2814 (-101)
23M → 24M
7:20 | 7:20/mi
40K· 24.85 mi
2:44:19
Rank: #2965 (-151)
24M → 40K
6:41 | 7:49/mi
25.2M
2:47:20
Rank: #3042 (-77)
40K → 25.2M
3:01 | 8:45/mi
Finish· 26.22 mi
2:55:07
Rank: #3272 (-230)
25.2M → Finish
7:47 | 7:38/mi

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
Time1:23:40
Pace6:23 /mi
2nd Half
Distance13.11 mi
Time1:31:27
Pace6:59 /mi
📊Positive Split: 9.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:46:0420:206:3320:20
6:33
-
10K
6.21 mi11:05:3739:536:2519:33
6:18
-0:15
15K
9.32 mi11:25:1759:336:2319:40
6:20
+0:02
20K
12.43 mi11:45:061:19:226:2319:49
6:23
+0:03
Half
13.11 mi11:49:241:23:406:234:18
6:18
-0:05
25K
15.53 mi12:04:561:39:126:2315:32
6:24
+0:06
30K
18.64 mi12:25:351:59:516:2620:39
6:39
+0:15
20M
20.00 mi12:34:482:09:046:279:13
6:47
+0:08
21M
21.00 mi12:42:032:16:196:297:15
7:15
+0:28
35K
21.75 mi12:47:082:21:246:305:05
6:48
-0:27
23M
23.00 mi12:56:022:30:186:328:54
7:06
+0:18
24M
24.00 mi13:03:222:37:386:347:20
7:20
+0:14
40K
24.85 mi13:10:032:44:196:376:41
7:49
+0:29
25.2M
25.20 mi13:13:042:47:206:383:01
8:45
+0:56
Finish
26.22 mi13:20:512:55:076:417:47
7:38
-1:07

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

6:18 /mi

Average Pace

6:41 /mi

Slowest Pace

8:45 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:18:52

45% of race

Time at Steady Pace

1:04:11

37% of race

Time at Slower Pace

32:04

18% of race

Average Pace: 6:41 /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 mi10:46:0420:206:3320:20
6:33
#4174
10K
6.21 mi11:05:3739:536:2519:33
6:18
#3200
15K
9.32 mi11:25:1759:336:2319:40
6:20
#2934
20K
12.43 mi11:45:061:19:226:2319:49
6:23
#2782
Half
13.11 mi11:49:241:23:406:234:18
6:18
#2756
25K
15.53 mi12:04:561:39:126:2315:32
6:24
#2665
30K
18.64 mi12:25:351:59:516:2620:39
6:39
#2606
20M
20.00 mi12:34:482:09:046:279:13
6:47
#2594
21M
21.00 mi12:42:032:16:196:297:15
7:15
#2618
35K
21.75 mi12:47:082:21:246:305:05
6:48
#2657
23M
23.00 mi12:56:022:30:186:328:54
7:06
#2713
24M
24.00 mi13:03:222:37:386:347:20
7:20
#2814
40K
24.85 mi13:10:032:44:196:376:41
7:49
#2965
25.2M
25.20 mi13:13:042:47:206:383:01
8:45
#3042
Finish
26.22 mi13:20:512:55:076:417:47
7:38
#3272
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi41742352352545(Top 9%)110(Top 0.9%)110(Top 2%)
10K6.21 mi3.10 mi3200+974151+84151+842393(Top 8%)98(Top 0.8%)98(Top 2%)
15K9.32 mi3.11 mi2934+266132+19132+192545(Top 9%)110(Top 0.9%)110(Top 2%)
20K12.43 mi3.11 mi2782+152123+9123+92424(Top 9%)105(Top 0.9%)105(Top 2%)
Half13.11 mi0.68 mi2756+26121+2121+22599(Top 9%)109(Top 0.9%)109(Top 2%)
25K15.53 mi2.42 mi2665+91115+6115+62418(Top 9%)113(Top 0.9%)113(Top 2%)
30K18.64 mi3.11 mi2606+59112+3112+32636(Top 9%)135(Top 1%)135(Top 2%)
20M20.00 mi1.36 mi2594+12111+1111+12863(Top 10%)179(Top 1%)179(Top 3%)
21M21.00 mi1.00 mi2618-24117-6117-63413(Top 12%)271(Top 2%)271(Top 5%)
35K21.75 mi0.75 mi2657-39120-3120-34125(Top 15%)414(Top 3%)414(Top 8%)
23M23.00 mi1.25 mi2713-56129-9129-94400(Top 15%)500(Top 4%)500(Top 9%)
24M24.00 mi1.00 mi2814-101141-12141-126622(Top 23%)1290(Top 11%)1290(Top 24%)
40K24.85 mi0.85 mi2965-151157-16157-168896(Top 31%)2393(Top 20%)2393(Top 44%)
25.2M25.20 mi0.35 mi3042-77165-8165-810310(Top 36%)3146(Top 26%)3146(Top 58%)
Finish26.22 mi1.02 mi3272-230198-33198-3310226(Top 36%)3086(Top 25%)3086(Top 56%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 9%
×21stories
+97ft-345ft

Overall

2545

Females

110

F18-39

110

5K→10K

3.1 - 6.2 mi

Top 8%
×5stories
+79ft-138ft

Overall

2393

Females

98

F18-39

98

10K→15K

6.2 - 9.3 mi

Top 9%
×3stories
+67ft-78ft

Overall

2545

Females

110

F18-39

110

15K→20K

9.3 - 12.4 mi

Top 9%
×5stories
+106ft-86ft

Overall

2424

Females

105

F18-39

105

20K→Half

12.4 - 13.1 mi

Top 9%
×2stories
+19ft-37ft

Overall

2599

Females

109

F18-39

109

Half→25K

13.1 - 15.5 mi

Top 9%
×4stories
+66ft-88ft

Overall

2418

Females

113

F18-39

113

25K→30K

15.5 - 18.6 mi

Top 9%
×9stories
+181ft-148ft

Overall

2636

Females

135

F18-39

135

30K→20M

18.6 - 20.0 mi

Top 10%
×5stories
+64ft-50ft

Overall

2863

Females

179

F18-39

179

20M→21M

20.0 - 21.0 mi

Top 12%
×8stories
+106ft-24ft

Overall

3413

Females

271

F18-39

271

21M→35K

21.0 - 21.8 mi

Top 15%
×7stories
+17ft-86ft

Overall

4125

Females

414

F18-39

414

35K→23M

21.8 - 23.0 mi

Top 15%
×5stories
+23ft-63ft

Overall

4400

Females

500

F18-39

500

23M→24M

23.0 - 24.0 mi

Top 23%
×6stories
+12ft-82ft

Overall

6622

Females

1290

F18-39

1290

24M→40K

24.0 - 24.9 mi

Top 31%
×1story
+6ft-20ft

Overall

8896

Females

2393

F18-39

2393

40K→25.2M

24.9 - 25.2 mi

Top 36%
×1story
+13ft-16ft

Overall

10310

Females

3146

F18-39

3146

25.2M→Finish

25.2 - 26.2 mi

Top 36%
×2stories
+22ft-21ft

Overall

10226

Females

3086

F18-39

3086

Passing Analysis

Category:
Athletes Passed
1878
Passed By
976
Net Change
+902
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4174
5K → 10K9751+974#4174#3200
10K → 15K2759+266#3200#2934
15K → 20K16917+152#2934#2782
20K → Half282+26#2782#2756
Half → 25K11221+91#2756#2665
25K → 30K11859+59#2665#2606
30K → 20M5644+12#2606#2594
20M → 21M4468-24#2594#2618
21M → 35K1958-39#2618#2657
35K → 23M4096-56#2657#2713
23M → 24M17118-101#2713#2814
24M → 40K11162-151#2814#2965
40K → 25.2M986-77#2965#3042
25.2M → Finish5235-230#3042#3272
TOTALS1878976+902
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

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