Boston Marathon logo
BOSTON MARATHON 2025

Chloe Byrd

Bib: 9086•F

FL

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 10%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:21
Rank: #4225
Start → 5K
6:33/mi
20:21 split
10K· 6.21 mi
40:44
Rank: #4187 (+38)
5K → 10K
6:34/mi
20:23 split
15K· 9.32 mi
1:01:14
Rank: #4177 (+10)
10K → 15K
6:36/mi
20:30 split
20K· 12.43 mi
1:22:04
Rank: #4205 (-28)
15K → 20K
6:42/mi
20:50 split
Half· 13.11 mi
1:26:33
Rank: #4193 (+12)
20K → Half
6:34/mi
4:29 split
25K· 15.53 mi
1:43:20
Rank: #4391 (-198)
Half → 25K
6:55/mi
16:47 split
30K· 18.64 mi
2:06:08
Rank: #4891 (-500)
25K → 30K
7:20/mi
22:48 split
20M
2:16:46
Rank: #5257 (-366)
30K → 20M
7:49/mi
10:38 split
21M
2:24:56
Rank: #5454 (-197)
20M → 21M
8:10/mi
8:10 split
35K· 21.75 mi
2:30:29
Rank: #5533 (-79)
21M → 35K
7:25/mi
5:33 split
23M
2:40:30
Rank: #5665 (-132)
35K → 23M
8:00/mi
10:01 split
24M
2:48:13
Rank: #5751 (-86)
23M → 24M
7:43/mi
7:43 split
40K· 24.85 mi
2:54:42
Rank: #5751
24M → 40K
7:35/mi
6:29 split
25.2M
2:57:31
Rank: #5727 (+24)
40K → 25.2M
8:10/mi
2:49 split
Finish· 26.22 mi
3:04:53
Rank: #5729 (-2)
25.2M → Finish
7:14/mi
7:22 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
Time1:26:33
Pace6:36 /mi
2nd Half
Distance13.11 mi
Time1:38:20
Pace7:30 /mi
📊Positive Split: 13.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:45:3220:216:3320:21
6:33
-
10K
6.21 mi11:05:5540:446:3320:23
6:34
+0:01
15K
9.32 mi11:26:251:01:146:3420:30
6:36
+0:02
20K
12.43 mi11:47:151:22:046:3620:50
6:42
+0:06
Half
13.11 mi11:51:441:26:336:364:29
6:34
-0:08
25K
15.53 mi12:08:311:43:206:3916:47
6:55
+0:21
30K
18.64 mi12:31:192:06:086:4622:48
7:20
+0:25
20M
20.00 mi12:41:572:16:466:5010:38
7:49
+0:29
21M
21.00 mi12:50:072:24:566:548:10
8:10
+0:21
35K
21.75 mi12:55:402:30:296:555:33
7:25
-0:45
23M
23.00 mi13:05:412:40:306:5910:01
8:00
+0:35
24M
24.00 mi13:13:242:48:137:017:43
7:43
-0:17
40K
24.85 mi13:19:532:54:427:026:29
7:35
-0:08
25.2M
25.20 mi13:22:422:57:317:032:49
8:10
+0:35
Finish
26.22 mi13:30:043:04:537:037:22
7:14
-0:56

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

6:33 /mi

Average Pace

7:03 /mi

Slowest Pace

8:10 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:43:20

56% of race

Time at Steady Pace

42:12

23% of race

Time at Slower Pace

39:21

21% of race

Average Pace: 7:03 /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 mi10:45:3220:216:3320:21
6:33
#4225
10K
6.21 mi11:05:5540:446:3320:23
6:34
#4187
15K
9.32 mi11:26:251:01:146:3420:30
6:36
#4177
20K
12.43 mi11:47:151:22:046:3620:50
6:42
#4205
Half
13.11 mi11:51:441:26:336:364:29
6:34
#4193
25K
15.53 mi12:08:311:43:206:3916:47
6:55
#4391
30K
18.64 mi12:31:192:06:086:4622:48
7:20
#4891
20M
20.00 mi12:41:572:16:466:5010:38
7:49
#5257
21M
21.00 mi12:50:072:24:566:548:10
8:10
#5454
35K
21.75 mi12:55:402:30:296:555:33
7:25
#5533
23M
23.00 mi13:05:412:40:306:5910:01
8:00
#5665
24M
24.00 mi13:13:242:48:137:017:43
7:43
#5751
40K
24.85 mi13:19:532:54:427:026:29
7:35
#5751
25.2M
25.20 mi13:22:422:57:317:032:49
8:10
#5727
Finish
26.22 mi13:30:043:04:537:037:22
7:14
#5729
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi42252442444228(Top 15%)246(Top 2%)246(Top 4%)
10K6.21 mi3.10 mi4187+38240+4240+44170(Top 15%)241(Top 2%)241(Top 4%)
15K9.32 mi3.11 mi4177+10236+4236+44228(Top 15%)246(Top 2%)246(Top 4%)
20K12.43 mi3.11 mi4205-28243-7243-74500(Top 16%)301(Top 2%)301(Top 6%)
Half13.11 mi0.68 mi4193+122432434262(Top 15%)264(Top 2%)264(Top 5%)
25K15.53 mi2.42 mi4391-198267-24267-245830(Top 21%)557(Top 5%)557(Top 10%)
30K18.64 mi3.11 mi4891-500359-92359-926685(Top 24%)892(Top 7%)892(Top 16%)
20M20.00 mi1.36 mi5257-366425-66425-669197(Top 32%)2067(Top 17%)2067(Top 38%)
21M21.00 mi1.00 mi5454-197460-35460-358385(Top 30%)1881(Top 15%)1881(Top 34%)
35K21.75 mi0.75 mi5533-79481-21481-218071(Top 28%)1697(Top 14%)1697(Top 31%)
23M23.00 mi1.25 mi5665-132532-51532-5110034(Top 35%)2746(Top 22%)2746(Top 50%)
24M24.00 mi1.00 mi5751-86565-33565-339217(Top 32%)2415(Top 20%)2415(Top 44%)
40K24.85 mi0.85 mi5751581-16581-167326(Top 26%)1678(Top 14%)1678(Top 31%)
25.2M25.20 mi0.35 mi5727+24584-3584-36894(Top 24%)1566(Top 13%)1566(Top 29%)
Finish26.22 mi1.02 mi5729-2601-17601-177235(Top 25%)1734(Top 14%)1734(Top 32%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 15%
×21story building
+97ft-345ft

Overall

4228

Females

246

F18-39

246

5K→10K

3.1 - 6.2 mi

Top 15%
×5story building
+79ft-138ft

Overall

4170

Females

241

F18-39

241

10K→15K

6.2 - 9.3 mi

Top 15%
×3story building
+67ft-78ft

Overall

4228

Females

246

F18-39

246

15K→20K

9.3 - 12.4 mi

Top 16%
×5story building
+106ft-86ft

Overall

4500

Females

301

F18-39

301

20K→Half

12.4 - 13.1 mi

Top 15%
×2story building
+19ft-37ft

Overall

4262

Females

264

F18-39

264

Half→25K

13.1 - 15.5 mi

Top 21%
×4story building
+66ft-88ft

Overall

5830

Females

557

F18-39

557

25K→30K

15.5 - 18.6 mi

Top 24%
×9story building
+181ft-148ft

Overall

6685

Females

892

F18-39

892

30K→20M

18.6 - 20.0 mi

Top 32%
×5story building
+64ft-50ft

Overall

9197

Females

2067

F18-39

2067

20M→21M

20.0 - 21.0 mi

Top 30%
×8story building
+106ft-24ft

Overall

8385

Females

1881

F18-39

1881

21M→35K

21.0 - 21.8 mi

Top 28%
×7story building
+17ft-86ft

Overall

8071

Females

1697

F18-39

1697

35K→23M

21.8 - 23.0 mi

Top 35%
×5story building
+23ft-63ft

Overall

10034

Females

2746

F18-39

2746

23M→24M

23.0 - 24.0 mi

Top 32%
×6story building
+12ft-82ft

Overall

9217

Females

2415

F18-39

2415

24M→40K

24.0 - 24.9 mi

Top 26%
×1story
+6ft-20ft

Overall

7326

Females

1678

F18-39

1678

40K→25.2M

24.9 - 25.2 mi

Top 24%
×1story
+13ft-16ft

Overall

6894

Females

1566

F18-39

1566

25.2M→Finish

25.2 - 26.2 mi

Top 25%
×2story building
+22ft-21ft

Overall

7235

Females

1734

F18-39

1734

Passing Analysis

Category:
Athletes Passed
781
Passed By
2285
Net Change
-1504
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4225
5K → 10K165127+38#4225#4187
10K → 15K9686+10#4187#4177
15K → 20K97125-28#4177#4205
20K → Half2614+12#4205#4193
Half → 25K43241-198#4193#4391
25K → 30K54554-500#4391#4891
30K → 20M16382-366#4891#5257
20M → 21M25222-197#5257#5454
21M → 35K27106-79#5454#5533
35K → 23M46178-132#5533#5665
23M → 24M33119-86#5665#5751
24M → 40K53530#5751#5751
40K → 25.2M4117+24#5751#5727
25.2M → Finish5961-2#5727#5729
TOTALS7812285-1504
📊

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