Boston Marathon logo
BOSTON MARATHON 2023

Katherine Nierva

Bib: 17806•F

AZ

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 38%
Gender (Female)
#0 / 11423
Top 19%
Masters (Masters Women)
#0 / 6539
Top 8%
Division (F40-44)
#0 / 1878
Top 17%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ 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
7:57/mi
24:41
↑ 97↓ 3451.5%
10K· 6.21 mi
7:48/mi
48:56
↑ 79↓ 1380.4%
15K· 9.32 mi
7:51/mi
1:13:18
↑ 67↓ 78
20K· 12.43 mi
7:48/mi
1:37:32
↑ 106↓ 860.1%
Half· 13.11 mi
7:39/mi
1:42:45
↑ 19↓ 370.5%
25K· 15.53 mi
7:44/mi
2:01:29
↑ 66↓ 880.2%
30K· 18.64 mi
7:48/mi
2:25:43
↑ 181↓ 1480.2%
20M
7:49/mi
2:36:21
↑ 64↓ 500.2%
21M
8:05/mi
2:44:26
↑ 106↓ 241.6%
35K· 21.75 mi
7:32/mi
2:50:04
↑ 17↓ 861.7%
23M
7:37/mi
2:59:36
↑ 23↓ 630.6%
24M
7:31/mi
3:07:07
↓ 821.3%
40K· 24.85 mi
7:28/mi
3:13:30
↓ 200.3%
25.2M
7:47/mi
3:16:11
↑ 13↓ 160.2%
Finish· 26.22 mi
7:09/mi
3:23:28
↑ 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 Half
Distance13.11 mi
Time1:42:45
Pace7:50 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:40:43
Pace7:41 /mi
📊Negative Split: 2.0% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:1724:417:5724:41
7:57
-
10K
6.21 mi11:39:3248:567:5324:15
7:48
-0:09
15K
9.32 mi12:03:541:13:187:5224:22
7:51
+0:03
20K
12.43 mi12:28:081:37:327:5124:14
7:48
-0:03
Half
13.11 mi12:33:211:42:457:505:13
7:39
-0:09
25K
15.53 mi12:52:052:01:297:4918:44
7:44
+0:05
30K
18.64 mi13:16:192:25:437:4924:14
7:48
+0:04
20M
20.00 mi13:26:572:36:217:4910:38
7:49
+0:01
21M
21.00 mi13:35:022:44:267:508:05
8:05
+0:16
35K
21.75 mi13:40:402:50:047:495:38
7:32
-0:33
23M
23.00 mi13:50:122:59:367:499:32
7:37
+0:05
24M
24.00 mi13:57:433:07:077:487:31
7:31
-0:06
40K
24.85 mi14:04:063:13:307:476:23
7:28
-0:03
25.2M
25.20 mi14:06:473:16:117:472:41
7:47
+0:19
Finish
26.22 mi14:14:043:23:287:467:17
7:09
-0:38

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

7:09 /mi

Average Pace

7:46 /mi

Slowest Pace

8:05 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:50:42

84% of race

Time at Steady Pace

32:46

16% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:46 /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 mi11:15:1724:417:5724:41
7:57
#13614
10K
6.21 mi11:39:3248:567:5324:15
7:48
#13387
15K
9.32 mi12:03:541:13:187:5224:22
7:51
#13270
20K
12.43 mi12:28:081:37:327:5124:14
7:48
#12830
Half
13.11 mi12:33:211:42:457:505:13
7:39
#12754
25K
15.53 mi12:52:052:01:297:4918:44
7:44
#12348
30K
18.64 mi13:16:192:25:437:4924:14
7:48
#11757
20M
20.00 mi13:26:572:36:217:4910:38
7:49
#11511
21M
21.00 mi13:35:022:44:267:508:05
8:05
#11251
35K
21.75 mi13:40:402:50:047:495:38
7:32
#11146
23M
23.00 mi13:50:122:59:367:499:32
7:37
#10867
24M
24.00 mi13:57:433:07:077:487:31
7:31
#10713
40K
24.85 mi14:04:063:13:307:476:23
7:28
#10516
25.2M
25.20 mi14:06:473:16:117:472:41
7:47
#10407
Finish
26.22 mi14:14:043:23:287:467:17
7:09
#10184
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi136143788378813073(Top 49%)3517(Top 31%)3517(Top 187%)
10K6.21 mi3.10 mi13387+2273673+1153673+11513167(Top 49%)3522(Top 31%)3522(Top 188%)
15K9.32 mi3.11 mi13270+1173616+573616+5713073(Top 49%)3517(Top 31%)3517(Top 187%)
20K12.43 mi3.11 mi12830+4403378+2383378+23811753(Top 44%)2816(Top 25%)2816(Top 150%)
Half13.11 mi0.68 mi12754+763338+403338+4011436(Top 43%)2577(Top 23%)2577(Top 137%)
25K15.53 mi2.42 mi12348+4063143+1953143+19510515(Top 39%)2238(Top 20%)2238(Top 119%)
30K18.64 mi3.11 mi11757+5912837+3062837+3069380(Top 35%)1881(Top 16%)1881(Top 100%)
20M20.00 mi1.36 mi11511+2462721+1162721+1169098(Top 34%)1838(Top 16%)1838(Top 98%)
21M21.00 mi1.00 mi11251+2602596+1252596+1257944(Top 30%)1503(Top 13%)1503(Top 80%)
35K21.75 mi0.75 mi11146+1052545+512545+518802(Top 33%)1835(Top 16%)1835(Top 98%)
23M23.00 mi1.25 mi10867+2792431+1142431+1147223(Top 27%)1265(Top 11%)1265(Top 67%)
24M24.00 mi1.00 mi10713+1542384+472384+477855(Top 30%)1630(Top 14%)1630(Top 87%)
40K24.85 mi0.85 mi10516+1972319+652319+656563(Top 25%)1199(Top 10%)1199(Top 64%)
25.2M25.20 mi0.35 mi10407+1092274+452274+455398(Top 20%)890(Top 8%)890(Top 47%)
Finish26.22 mi1.02 mi10184+2232189+852189+856136(Top 23%)1118(Top 10%)1118(Top 60%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 49%
×21story building
+97ft-345ft

Overall

13073

Females

3517

F40-44

3517

5K→10K

3.1 - 6.2 mi

Top 49%
×5story building
+79ft-138ft

Overall

13167

Females

3522

F40-44

3522

10K→15K

6.2 - 9.3 mi

Top 49%
×3story building
+67ft-78ft

Overall

13073

Females

3517

F40-44

3517

15K→20K

9.3 - 12.4 mi

Top 44%
×5story building
+106ft-86ft

Overall

11753

Females

2816

F40-44

2816

20K→Half

12.4 - 13.1 mi

Top 43%
×2story building
+19ft-37ft

Overall

11436

Females

2577

F40-44

2577

Half→25K

13.1 - 15.5 mi

Top 39%
×4story building
+66ft-88ft

Overall

10515

Females

2238

F40-44

2238

25K→30K

15.5 - 18.6 mi

Top 35%
×9story building
+181ft-148ft

Overall

9380

Females

1881

F40-44

1881

30K→20M

18.6 - 20.0 mi

Top 34%
×5story building
+64ft-50ft

Overall

9098

Females

1838

F40-44

1838

20M→21M

20.0 - 21.0 mi

Top 30%
×8story building
+106ft-24ft

Overall

7944

Females

1503

F40-44

1503

21M→35K

21.0 - 21.8 mi

Top 33%
×7story building
+17ft-86ft

Overall

8802

Females

1835

F40-44

1835

35K→23M

21.8 - 23.0 mi

Top 27%
×5story building
+23ft-63ft

Overall

7223

Females

1265

F40-44

1265

23M→24M

23.0 - 24.0 mi

Top 30%
×6story building
+12ft-82ft

Overall

7855

Females

1630

F40-44

1630

24M→40K

24.0 - 24.9 mi

Top 25%
×1story
+6ft-20ft

Overall

6563

Females

1199

F40-44

1199

40K→25.2M

24.9 - 25.2 mi

Top 20%
×1story
+13ft-16ft

Overall

5398

Females

890

F40-44

890

25.2M→Finish

25.2 - 26.2 mi

Top 23%
×2story building
+22ft-21ft

Overall

6136

Females

1118

F40-44

1118

Passing Analysis

Category:
Athletes Passed
3868
Passed By
438
Net Change
+3430
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13614
5K → 10K423196+227#13614#13387
10K → 15K271154+117#13387#13270
15K → 20K46222+440#13270#12830
20K → Half859+76#12830#12754
Half → 25K4148+406#12754#12348
25K → 30K6009+591#12348#11757
30K → 20M2559+246#11757#11511
20M → 21M2644+260#11511#11251
21M → 35K1094+105#11251#11146
35K → 23M2834+279#11146#10867
23M → 24M16511+154#10867#10713
24M → 40K2014+197#10713#10516
40K → 25.2M1101+109#10516#10407
25.2M → Finish2263+223#10407#10184
TOTALS3868438+3430
📊

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