Boston Marathon logo
BOSTON MARATHON 2025

Catherine Blizzard

Bib: 12952•F

NY

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 22%
Gender (Female)
#0 / 12228
Top 6%
Division (F18-39)
#0 / 5469
Top 12%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:06
Rank: #8768
Start → 5K
22:06 | 7:07/mi
10K· 6.21 mi
44:03
Rank: #8566 (+202)
5K → 10K
21:57 | 7:04/mi
15K· 9.32 mi
1:06:06
Rank: #8418 (+148)
10K → 15K
22:03 | 7:06/mi
20K· 12.43 mi
1:28:04
Rank: #8073 (+345)
15K → 20K
21:58 | 7:04/mi
Half· 13.11 mi
1:32:54
Rank: #8078 (-5)
20K → Half
4:50 | 7:05/mi
25K· 15.53 mi
1:50:08
Rank: #7861 (+217)
Half → 25K
17:14 | 7:06/mi
30K· 18.64 mi
2:12:32
Rank: #7418 (+443)
25K → 30K
22:24 | 7:13/mi
20M
2:22:16
Rank: #7155 (+263)
30K → 20M
9:44 | 7:10/mi
21M
2:29:47
Rank: #6936 (+219)
20M → 21M
7:31 | 7:31/mi
35K· 21.75 mi
2:35:04
Rank: #6835 (+101)
21M → 35K
5:17 | 7:04/mi
23M
2:44:07
Rank: #6635 (+200)
35K → 23M
9:03 | 7:14/mi
24M
2:51:18
Rank: #6538 (+97)
23M → 24M
7:11 | 7:11/mi
40K· 24.85 mi
2:57:31
Rank: #6444 (+94)
24M → 40K
6:13 | 7:16/mi
25.2M
3:00:18
Rank: #6415 (+29)
40K → 25.2M
2:47 | 8:04/mi
Finish· 26.22 mi
3:07:36
Rank: #6376 (+39)
25.2M → Finish
7:18 | 7:10/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
Time1:32:54
Pace7:05 /mi
2nd Half
Distance13.11 mi
Time1:34:42
Pace7:13 /mi
📊Positive Split: 1.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:50:5422:067:0722:06
7:07
-
10K
6.21 mi11:12:5144:037:0521:57
7:04
-0:03
15K
9.32 mi11:34:541:06:067:0622:03
7:06
+0:02
20K
12.43 mi11:56:521:28:047:0521:58
7:04
-0:02
Half
13.11 mi12:01:421:32:547:054:50
7:05
+0:01
25K
15.53 mi12:18:561:50:087:0517:14
7:06
+0:01
30K
18.64 mi12:41:202:12:327:0722:24
7:13
+0:07
20M
20.00 mi12:51:042:22:167:079:44
7:10
-0:03
21M
21.00 mi12:58:352:29:477:087:31
7:31
+0:21
35K
21.75 mi13:03:522:35:047:085:17
7:04
-0:27
23M
23.00 mi13:12:552:44:077:089:03
7:14
+0:10
24M
24.00 mi13:20:062:51:187:087:11
7:11
-0:03
40K
24.85 mi13:26:192:57:317:096:13
7:16
+0:05
25.2M
25.20 mi13:29:063:00:187:092:47
8:04
+0:48
Finish
26.22 mi13:36:243:07:367:107:18
7:10
-0:54

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

7:04 /mi

Average Pace

7:10 /mi

Slowest Pace

8:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:04:49

99% of race

Time at Steady Pace

2:47

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:09 /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 mi10:50:5422:067:0722:06
7:07
#8768
10K
6.21 mi11:12:5144:037:0521:57
7:04
#8566
15K
9.32 mi11:34:541:06:067:0622:03
7:06
#8418
20K
12.43 mi11:56:521:28:047:0521:58
7:04
#8073
Half
13.11 mi12:01:421:32:547:054:50
7:05
#8078
25K
15.53 mi12:18:561:50:087:0517:14
7:06
#7861
30K
18.64 mi12:41:202:12:327:0722:24
7:13
#7418
20M
20.00 mi12:51:042:22:167:079:44
7:10
#7155
21M
21.00 mi12:58:352:29:477:087:31
7:31
#6936
35K
21.75 mi13:03:522:35:047:085:17
7:04
#6835
23M
23.00 mi13:12:552:44:077:089:03
7:14
#6635
24M
24.00 mi13:20:062:51:187:087:11
7:11
#6538
40K
24.85 mi13:26:192:57:317:096:13
7:16
#6444
25.2M
25.20 mi13:29:063:00:187:092:47
8:04
#6415
Finish
26.22 mi13:36:243:07:367:107:18
7:10
#6376
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi8768126612668330(Top 29%)1171(Top 10%)1171(Top 21%)
10K6.21 mi3.10 mi8566+2021212+541212+548398(Top 30%)1142(Top 9%)1142(Top 21%)
15K9.32 mi3.11 mi8418+1481164+481164+488330(Top 29%)1171(Top 10%)1171(Top 21%)
20K12.43 mi3.11 mi8073+3451048+1161048+1167348(Top 26%)872(Top 7%)872(Top 16%)
Half13.11 mi0.68 mi8078-51055-71055-78205(Top 29%)1143(Top 9%)1143(Top 21%)
25K15.53 mi2.42 mi7861+217995+60995+607033(Top 25%)870(Top 7%)870(Top 16%)
30K18.64 mi3.11 mi7418+443891+104891+1045974(Top 21%)668(Top 5%)668(Top 12%)
20M20.00 mi1.36 mi7155+263845+46845+465028(Top 18%)517(Top 4%)517(Top 9%)
21M21.00 mi1.00 mi6936+219805+40805+404722(Top 17%)540(Top 4%)540(Top 10%)
35K21.75 mi0.75 mi6835+101798+7798+75818(Top 20%)860(Top 7%)860(Top 16%)
23M23.00 mi1.25 mi6635+200781+17781+175071(Top 18%)692(Top 6%)692(Top 13%)
24M24.00 mi1.00 mi6538+97771+10771+105747(Top 20%)968(Top 8%)968(Top 18%)
40K24.85 mi0.85 mi6444+94769+2769+25509(Top 19%)935(Top 8%)935(Top 17%)
25.2M25.20 mi0.35 mi6415+29770-1770-16363(Top 22%)1366(Top 11%)1366(Top 25%)
Finish26.22 mi1.02 mi6376+39782-12782-126827(Top 24%)1572(Top 13%)1572(Top 29%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 29%
×21stories
+97ft-345ft

Overall

8330

Females

1171

F18-39

1171

5K→10K

3.1 - 6.2 mi

Top 30%
×5stories
+79ft-138ft

Overall

8398

Females

1142

F18-39

1142

10K→15K

6.2 - 9.3 mi

Top 29%
×3stories
+67ft-78ft

Overall

8330

Females

1171

F18-39

1171

15K→20K

9.3 - 12.4 mi

Top 26%
×5stories
+106ft-86ft

Overall

7348

Females

872

F18-39

872

20K→Half

12.4 - 13.1 mi

Top 29%
×2stories
+19ft-37ft

Overall

8205

Females

1143

F18-39

1143

Half→25K

13.1 - 15.5 mi

Top 25%
×4stories
+66ft-88ft

Overall

7033

Females

870

F18-39

870

25K→30K

15.5 - 18.6 mi

Top 21%
×9stories
+181ft-148ft

Overall

5974

Females

668

F18-39

668

30K→20M

18.6 - 20.0 mi

Top 18%
×5stories
+64ft-50ft

Overall

5028

Females

517

F18-39

517

20M→21M

20.0 - 21.0 mi

Top 17%
×8stories
+106ft-24ft

Overall

4722

Females

540

F18-39

540

21M→35K

21.0 - 21.8 mi

Top 20%
×7stories
+17ft-86ft

Overall

5818

Females

860

F18-39

860

35K→23M

21.8 - 23.0 mi

Top 18%
×5stories
+23ft-63ft

Overall

5071

Females

692

F18-39

692

23M→24M

23.0 - 24.0 mi

Top 20%
×6stories
+12ft-82ft

Overall

5747

Females

968

F18-39

968

24M→40K

24.0 - 24.9 mi

Top 19%
×1story
+6ft-20ft

Overall

5509

Females

935

F18-39

935

40K→25.2M

24.9 - 25.2 mi

Top 22%
×1story
+13ft-16ft

Overall

6363

Females

1366

F18-39

1366

25.2M→Finish

25.2 - 26.2 mi

Top 24%
×2stories
+22ft-21ft

Overall

6827

Females

1572

F18-39

1572

Passing Analysis

Category:
Athletes Passed
2788
Passed By
396
Net Change
+2392
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8768
5K → 10K322120+202#8768#8566
10K → 15K22577+148#8566#8418
15K → 20K36823+345#8418#8073
20K → Half2631-5#8073#8078
Half → 25K24023+217#8078#7861
25K → 30K45512+443#7861#7418
30K → 20M2641+263#7418#7155
20M → 21M2245+219#7155#6936
21M → 35K11211+101#6936#6835
35K → 23M21515+200#6835#6635
23M → 24M11518+97#6635#6538
24M → 40K10511+94#6538#6444
40K → 25.2M4112+29#6444#6415
25.2M → Finish7637+39#6415#6376
TOTALS2788396+2392
📊

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