Boston Marathon logo
BOSTON MARATHON 2025

Chandra Ziegler

Bib: 20473•F

MI

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Top 45%
Division (F40-44)
#0 / 1718
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
8:18/mi
25:46
↑ 97↓ 3451.5%
10K· 6.21 mi
8:13/mi
51:17
↑ 79↓ 1380.4%
15K· 9.32 mi
8:14/mi
1:16:53
↑ 67↓ 78
20K· 12.43 mi
8:30/mi
1:43:16
↑ 106↓ 860.1%
Half· 13.11 mi
8:30/mi
1:49:04
↑ 19↓ 370.5%
25K· 15.53 mi
8:38/mi
2:09:59
↑ 66↓ 880.2%
30K· 18.64 mi
8:57/mi
2:37:46
↑ 181↓ 1480.2%
20M
9:05/mi
2:50:07
↑ 64↓ 500.2%
21M
9:48/mi
2:59:55
↑ 106↓ 241.6%
35K· 21.75 mi
9:17/mi
3:06:52
↑ 17↓ 861.7%
23M
9:29/mi
3:18:45
↑ 23↓ 630.6%
24M
9:31/mi
3:28:16
↓ 821.3%
40K· 24.85 mi
9:51/mi
3:36:41
↓ 200.3%
25.2M
10:23/mi
3:40:16
↑ 13↓ 160.2%
Finish· 26.22 mi
8:57/mi
3:49:23
↑ 22↓ 21

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
Time1:49:04
Pace8:19 /mi
2nd Half
Distance13.11 mi
Time2:00:19
Pace9:11 /mi
📊Positive Split: 10.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:3125:468:1825:46
8:18
-
10K
6.21 mi11:45:0251:178:1525:31
8:13
-0:05
15K
9.32 mi12:10:381:16:538:1525:36
8:14
+0:01
20K
12.43 mi12:37:011:43:168:1926:23
8:30
+0:16
Half
13.11 mi12:42:491:49:048:195:48
8:30
0:00
25K
15.53 mi13:03:442:09:598:2220:55
8:38
+0:08
30K
18.64 mi13:31:312:37:468:2827:47
8:57
+0:19
20M
20.00 mi13:43:522:50:078:3012:21
9:05
+0:08
21M
21.00 mi13:53:402:59:558:349:48
9:48
+0:43
35K
21.75 mi14:00:373:06:528:366:57
9:17
-0:31
23M
23.00 mi14:12:303:18:458:3811:53
9:29
+0:12
24M
24.00 mi14:22:013:28:168:419:31
9:31
+0:02
40K
24.85 mi14:30:263:36:418:438:25
9:51
+0:20
25.2M
25.20 mi14:34:013:40:168:443:35
10:23
+0:32
Finish
26.22 mi14:43:083:49:238:459:07
8:57
-1:26

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

8:13 /mi

Average Pace

8:45 /mi

Slowest Pace

10:23 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:49:04

48% of race

Time at Steady Pace

1:10:10

31% of race

Time at Slower Pace

50:09

22% of race

Average Pace: 8:45 /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 mi11:19:3125:468:1825:46
8:18
#18685
10K
6.21 mi11:45:0251:178:1525:31
8:13
#18334
15K
9.32 mi12:10:381:16:538:1525:36
8:14
#18098
20K
12.43 mi12:37:011:43:168:1926:23
8:30
#18057
Half
13.11 mi12:42:491:49:048:195:48
8:30
#18098
25K
15.53 mi13:03:442:09:598:2220:55
8:38
#18043
30K
18.64 mi13:31:312:37:468:2827:47
8:57
#17869
20M
20.00 mi13:43:522:50:078:3012:21
9:05
#17821
21M
21.00 mi13:53:402:59:558:349:48
9:48
#17808
35K
21.75 mi14:00:373:06:528:366:57
9:17
#17872
23M
23.00 mi14:12:303:18:458:3811:53
9:29
#17929
24M
24.00 mi14:22:013:28:168:419:31
9:31
#18009
40K
24.85 mi14:30:263:36:418:438:25
9:51
#18131
25.2M
25.20 mi14:34:013:40:168:443:35
10:23
#18143
Finish
26.22 mi14:43:083:49:238:459:07
8:57
#18176
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi186856731673117671(Top 62%)6125(Top 50%)6125(Top 357%)
10K6.21 mi3.10 mi18334+3516525+2066525+20617993(Top 63%)6287(Top 51%)6287(Top 366%)
15K9.32 mi3.11 mi18098+2366389+1366389+13617671(Top 62%)6125(Top 50%)6125(Top 357%)
20K12.43 mi3.11 mi18057+416365+246365+2418191(Top 64%)6446(Top 53%)6446(Top 375%)
Half13.11 mi0.68 mi18098-416395-306395-3019246(Top 68%)7037(Top 58%)7037(Top 410%)
25K15.53 mi2.42 mi18043+556384+116384+1117983(Top 63%)6424(Top 53%)6424(Top 374%)
30K18.64 mi3.11 mi17869+1746331+536331+5317393(Top 61%)6246(Top 51%)6246(Top 364%)
20M20.00 mi1.36 mi17821+486325+66325+617270(Top 61%)6294(Top 51%)6294(Top 366%)
21M21.00 mi1.00 mi17808+136329-46329-417498(Top 62%)6534(Top 53%)6534(Top 380%)
35K21.75 mi0.75 mi17872-646373-446373-4419542(Top 69%)7734(Top 63%)7734(Top 450%)
23M23.00 mi1.25 mi17929-576456-836456-8318667(Top 66%)7327(Top 60%)7327(Top 426%)
24M24.00 mi1.00 mi18009-806524-686524-6819678(Top 69%)7917(Top 65%)7917(Top 461%)
40K24.85 mi0.85 mi18131-1226618-946618-9419944(Top 70%)8123(Top 66%)8123(Top 473%)
25.2M25.20 mi0.35 mi18143-126636-186636-1818637(Top 66%)7448(Top 61%)7448(Top 434%)
Finish26.22 mi1.02 mi18176-336670-346670-3418781(Top 66%)7477(Top 61%)7477(Top 435%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 62%
×21story building
+97ft-345ft

Overall

17671

Females

6125

F40-44

6125

5K→10K

3.1 - 6.2 mi

Top 63%
×5story building
+79ft-138ft

Overall

17993

Females

6287

F40-44

6287

10K→15K

6.2 - 9.3 mi

Top 62%
×3story building
+67ft-78ft

Overall

17671

Females

6125

F40-44

6125

15K→20K

9.3 - 12.4 mi

Top 64%
×5story building
+106ft-86ft

Overall

18191

Females

6446

F40-44

6446

20K→Half

12.4 - 13.1 mi

Top 68%
×2story building
+19ft-37ft

Overall

19246

Females

7037

F40-44

7037

Half→25K

13.1 - 15.5 mi

Top 63%
×4story building
+66ft-88ft

Overall

17983

Females

6424

F40-44

6424

25K→30K

15.5 - 18.6 mi

Top 61%
×9story building
+181ft-148ft

Overall

17393

Females

6246

F40-44

6246

30K→20M

18.6 - 20.0 mi

Top 61%
×5story building
+64ft-50ft

Overall

17270

Females

6294

F40-44

6294

20M→21M

20.0 - 21.0 mi

Top 62%
×8story building
+106ft-24ft

Overall

17498

Females

6534

F40-44

6534

21M→35K

21.0 - 21.8 mi

Top 69%
×7story building
+17ft-86ft

Overall

19542

Females

7734

F40-44

7734

35K→23M

21.8 - 23.0 mi

Top 66%
×5story building
+23ft-63ft

Overall

18667

Females

7327

F40-44

7327

23M→24M

23.0 - 24.0 mi

Top 69%
×6story building
+12ft-82ft

Overall

19678

Females

7917

F40-44

7917

24M→40K

24.0 - 24.9 mi

Top 70%
×1story
+6ft-20ft

Overall

19944

Females

8123

F40-44

8123

40K→25.2M

24.9 - 25.2 mi

Top 66%
×1story
+13ft-16ft

Overall

18637

Females

7448

F40-44

7448

25.2M→Finish

25.2 - 26.2 mi

Top 66%
×2story building
+22ft-21ft

Overall

18781

Females

7477

F40-44

7477

Passing Analysis

Category:
Athletes Passed
2091
Passed By
1582
Net Change
+509
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18685
5K → 10K479128+351#18685#18334
10K → 15K31680+236#18334#18098
15K → 20K209168+41#18098#18057
20K → Half2667-41#18057#18098
Half → 25K191136+55#18098#18043
25K → 30K317143+174#18043#17869
30K → 20M14193+48#17869#17821
20M → 21M10592+13#17821#17808
21M → 35K49113-64#17808#17872
35K → 23M90147-57#17872#17929
23M → 24M50130-80#17929#18009
24M → 40K41163-122#18009#18131
40K → 25.2M2638-12#18131#18143
25.2M → Finish5184-33#18143#18176
TOTALS20911582+509
📊

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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing