Boston Marathon logo
BOSTON MARATHON 2023

Erin Biondi

Bib: 19677•F

CA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Gender (Female)
#0 / 11423
Division (F18-39)
#0 / 4884
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
26:54
Rank: #18629
Start → 5K
26:54 | 8:39/mi
10K· 6.21 mi
53:34
Rank: #18636 (-7)
5K → 10K
26:40 | 8:35/mi
15K· 9.32 mi
1:20:07
Rank: #18460 (+176)
10K → 15K
26:33 | 8:33/mi
20K· 12.43 mi
1:48:01
Rank: #18743 (-283)
15K → 20K
27:54 | 8:59/mi
Half· 13.11 mi
1:53:44
Rank: #18667 (+76)
20K → Half
5:43 | 8:23/mi
25K· 15.53 mi
2:14:22
Rank: #18265 (+402)
Half → 25K
20:38 | 8:31/mi
30K· 18.64 mi
2:41:49
Rank: #17856 (+409)
25K → 30K
27:27 | 8:50/mi
20M
2:54:00
Rank: #17728 (+128)
30K → 20M
12:11 | 8:58/mi
21M
3:03:41
Rank: #17679 (+49)
20M → 21M
9:41 | 9:41/mi
35K· 21.75 mi
3:10:05
Rank: #17583 (+96)
21M → 35K
6:24 | 8:33/mi
23M
3:21:00
Rank: #17406 (+177)
35K → 23M
10:55 | 8:43/mi
24M
3:29:30
Rank: #17268 (+138)
23M → 24M
8:30 | 8:30/mi
40K· 24.85 mi
3:36:58
Rank: #17164 (+104)
24M → 40K
7:28 | 8:44/mi
25.2M
3:40:12
Rank: #17135 (+29)
40K → 25.2M
3:14 | 9:23/mi
Finish· 26.22 mi
3:48:44
Rank: #17037 (+98)
25.2M → Finish
8:32 | 8:22/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
Time1:53:44
Pace8:41 /mi
2nd Half
Distance13.11 mi
Time1:55:00
Pace8:46 /mi
📊Positive Split: 1.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:18:2826:548:3926:54
8:39
-
10K
6.21 mi11:45:0853:348:3726:40
8:35
-0:04
15K
9.32 mi12:11:411:20:078:3626:33
8:33
-0:02
20K
12.43 mi12:39:351:48:018:4227:54
8:59
+0:26
Half
13.11 mi12:45:181:53:448:415:43
8:23
-0:36
25K
15.53 mi13:05:562:14:228:3920:38
8:31
+0:08
30K
18.64 mi13:33:232:41:498:4127:27
8:50
+0:19
20M
20.00 mi13:45:342:54:008:4212:11
8:58
+0:08
21M
21.00 mi13:55:153:03:418:459:41
9:41
+0:43
35K
21.75 mi14:01:393:10:058:446:24
8:33
-1:08
23M
23.00 mi14:12:343:21:008:4410:55
8:43
+0:10
24M
24.00 mi14:21:043:29:308:448:30
8:30
-0:13
40K
24.85 mi14:28:323:36:588:447:28
8:44
+0:14
25.2M
25.20 mi14:31:463:40:128:443:14
9:23
+0:39
Finish
26.22 mi14:40:183:48:448:448:32
8:22
-1:01

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

8:22 /mi

Average Pace

8:44 /mi

Slowest Pace

9:41 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:35:49

94% of race

Time at Steady Pace

12:55

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:43 /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 mi11:18:2826:548:3926:54
8:39
#18629
10K
6.21 mi11:45:0853:348:3726:40
8:35
#18636
15K
9.32 mi12:11:411:20:078:3626:33
8:33
#18460
20K
12.43 mi12:39:351:48:018:4227:54
8:59
#18743
Half
13.11 mi12:45:181:53:448:415:43
8:23
#18667
25K
15.53 mi13:05:562:14:228:3920:38
8:31
#18265
30K
18.64 mi13:33:232:41:498:4127:27
8:50
#17856
20M
20.00 mi13:45:342:54:008:4212:11
8:58
#17728
21M
21.00 mi13:55:153:03:418:459:41
9:41
#17679
35K
21.75 mi14:01:393:10:058:446:24
8:33
#17583
23M
23.00 mi14:12:343:21:008:4410:55
8:43
#17406
24M
24.00 mi14:21:043:29:308:448:30
8:30
#17268
40K
24.85 mi14:28:323:36:588:447:28
8:44
#17164
25.2M
25.20 mi14:31:463:40:128:443:14
9:23
#17135
Finish
26.22 mi14:40:183:48:448:448:32
8:22
#17037
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi186296952695218126(Top 68%)6574(Top 58%)6574(Top 135%)
10K6.21 mi3.10 mi18636-76903+496903+4918767(Top 70%)6937(Top 61%)6937(Top 142%)
15K9.32 mi3.11 mi18460+1766787+1166787+11618126(Top 68%)6574(Top 58%)6574(Top 135%)
20K12.43 mi3.11 mi18743-2836960-1736960-17319600(Top 74%)7435(Top 65%)7435(Top 152%)
Half13.11 mi0.68 mi18667+766915+456915+4517053(Top 64%)5932(Top 52%)5932(Top 121%)
25K15.53 mi2.42 mi18265+4026688+2276688+22716274(Top 61%)5601(Top 49%)5601(Top 115%)
30K18.64 mi3.11 mi17856+4096473+2156473+21516293(Top 61%)5669(Top 50%)5669(Top 116%)
20M20.00 mi1.36 mi17728+1286414+596414+5916371(Top 61%)5796(Top 51%)5796(Top 119%)
21M21.00 mi1.00 mi17679+496398+166398+1616796(Top 63%)6072(Top 53%)6072(Top 124%)
35K21.75 mi0.75 mi17583+966357+416357+4115640(Top 59%)5499(Top 48%)5499(Top 113%)
23M23.00 mi1.25 mi17406+1776264+936264+9314533(Top 55%)4927(Top 43%)4927(Top 101%)
24M24.00 mi1.00 mi17268+1386184+806184+8014520(Top 55%)4977(Top 44%)4977(Top 102%)
40K24.85 mi0.85 mi17164+1046151+336151+3314755(Top 55%)5168(Top 45%)5168(Top 106%)
25.2M25.20 mi0.35 mi17135+296143+86143+814661(Top 55%)5127(Top 45%)5127(Top 105%)
Finish26.22 mi1.02 mi17037+986096+476096+4714600(Top 55%)5051(Top 44%)5051(Top 103%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 68%
×21stories
+97ft-345ft

Overall

18126

Females

6574

F18-39

6574

5K→10K

3.1 - 6.2 mi

Top 70%
×5stories
+79ft-138ft

Overall

18767

Females

6937

F18-39

6937

10K→15K

6.2 - 9.3 mi

Top 68%
×3stories
+67ft-78ft

Overall

18126

Females

6574

F18-39

6574

15K→20K

9.3 - 12.4 mi

Top 74%
×5stories
+106ft-86ft

Overall

19600

Females

7435

F18-39

7435

20K→Half

12.4 - 13.1 mi

Top 64%
×2stories
+19ft-37ft

Overall

17053

Females

5932

F18-39

5932

Half→25K

13.1 - 15.5 mi

Top 61%
×4stories
+66ft-88ft

Overall

16274

Females

5601

F18-39

5601

25K→30K

15.5 - 18.6 mi

Top 61%
×9stories
+181ft-148ft

Overall

16293

Females

5669

F18-39

5669

30K→20M

18.6 - 20.0 mi

Top 61%
×5stories
+64ft-50ft

Overall

16371

Females

5796

F18-39

5796

20M→21M

20.0 - 21.0 mi

Top 63%
×8stories
+106ft-24ft

Overall

16796

Females

6072

F18-39

6072

21M→35K

21.0 - 21.8 mi

Top 59%
×7stories
+17ft-86ft

Overall

15640

Females

5499

F18-39

5499

35K→23M

21.8 - 23.0 mi

Top 55%
×5stories
+23ft-63ft

Overall

14533

Females

4927

F18-39

4927

23M→24M

23.0 - 24.0 mi

Top 55%
×6stories
+12ft-82ft

Overall

14520

Females

4977

F18-39

4977

24M→40K

24.0 - 24.9 mi

Top 55%
×1story
+6ft-20ft

Overall

14755

Females

5168

F18-39

5168

40K→25.2M

24.9 - 25.2 mi

Top 55%
×1story
+13ft-16ft

Overall

14661

Females

5127

F18-39

5127

25.2M→Finish

25.2 - 26.2 mi

Top 55%
×2stories
+22ft-21ft

Overall

14600

Females

5051

F18-39

5051

Passing Analysis

Category:
Athletes Passed
2594
Passed By
1002
Net Change
+1592
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18629
5K → 10K332339-7#18629#18636
10K → 15K276100+176#18636#18460
15K → 20K83366-283#18460#18743
20K → Half782+76#18743#18667
Half → 25K41210+402#18667#18265
25K → 30K43526+409#18265#17856
30K → 20M15729+128#17856#17728
20M → 21M10455+49#17728#17679
21M → 35K1059+96#17679#17583
35K → 23M1869+177#17583#17406
23M → 24M15012+138#17406#17268
24M → 40K11612+104#17268#17164
40K → 25.2M4011+29#17164#17135
25.2M → Finish12022+98#17135#17037
TOTALS25941002+1592
📊

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