Boston Marathon logo
BOSTON MARATHON 2023

Kristina Southam

Bib: 27534•F

UT

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

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
9:09/mi
28:25
↑ 97↓ 3451.5%
10K· 6.21 mi
9:32/mi
58:03
↑ 79↓ 1380.4%
15K· 9.32 mi
9:45/mi
1:28:20
↑ 67↓ 78
20K· 12.43 mi
10:00/mi
1:59:25
↑ 106↓ 860.1%
Half· 13.11 mi
9:26/mi
2:05:51
↑ 19↓ 370.5%
25K· 15.53 mi
12:14/mi
2:35:30
↑ 66↓ 880.2%
30K· 18.64 mi
10:56/mi
3:09:27
↑ 181↓ 1480.2%
20M
10:48/mi
3:24:08
↑ 64↓ 500.2%
21M
11:56/mi
3:36:04
↑ 106↓ 241.6%
35K· 21.75 mi
10:06/mi
3:43:37
↑ 17↓ 861.7%
23M
10:46/mi
3:57:06
↑ 23↓ 630.6%
24M
10:37/mi
4:07:43
↓ 821.3%
40K· 24.85 mi
11:13/mi
4:17:18
↓ 200.3%
25.2M
11:42/mi
4:21:20
↑ 13↓ 160.2%
Finish· 26.22 mi
10:38/mi
4:32:10
↑ 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
Time2:05:51
Pace9:36 /mi
2nd Half
Distance13.11 mi
Time2:26:19
Pace11:10 /mi
📊Positive Split: 16.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:53:4828:259:0928:25
9:09
-
10K
6.21 mi12:23:2658:039:2129:38
9:32
+0:23
15K
9.32 mi12:53:431:28:209:2930:17
9:45
+0:13
20K
12.43 mi13:24:481:59:259:3731:05
10:00
+0:15
Half
13.11 mi13:31:142:05:519:366:26
9:26
-0:34
25K
15.53 mi14:00:532:35:3010:0129:39
12:14
+2:48
30K
18.64 mi14:34:503:09:2710:1033:57
10:56
-1:18
20M
20.00 mi14:49:313:24:0810:1214:41
10:48
-0:08
21M
21.00 mi15:01:273:36:0410:1711:56
11:56
+1:08
35K
21.75 mi15:09:003:43:3710:177:33
10:06
-1:50
23M
23.00 mi15:22:293:57:0610:1913:29
10:46
+0:40
24M
24.00 mi15:33:064:07:4310:1910:37
10:37
-0:09
40K
24.85 mi15:42:414:17:1810:219:35
11:13
+0:36
25.2M
25.20 mi15:46:434:21:2010:224:02
11:42
+0:29
Finish
26.22 mi15:57:334:32:1010:2310:50
10:38
-1:04

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

9:09 /mi

Average Pace

10:23 /mi

Slowest Pace

12:14 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:13:24

49% of race

Time at Steady Pace

1:23:34

31% of race

Time at Slower Pace

55:12

20% of race

Average Pace: 10:23 /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 mi11:53:4828:259:0928:25
9:09
#21038
10K
6.21 mi12:23:2658:039:2129:38
9:32
#21868
15K
9.32 mi12:53:431:28:209:2930:17
9:45
#22230
20K
12.43 mi13:24:481:59:259:3731:05
10:00
#22425
Half
13.11 mi13:31:142:05:519:366:26
9:26
#22402
25K
15.53 mi14:00:532:35:3010:0129:39
12:14
#23223
30K
18.64 mi14:34:503:09:2710:1033:57
10:56
#23176
20M
20.00 mi14:49:313:24:0810:1214:41
10:48
#23101
21M
21.00 mi15:01:273:36:0410:1711:56
11:56
#23069
35K
21.75 mi15:09:003:43:3710:177:33
10:06
#23015
23M
23.00 mi15:22:293:57:0610:1913:29
10:46
#22935
24M
24.00 mi15:33:064:07:4310:1910:37
10:37
#22895
40K
24.85 mi15:42:414:17:1810:219:35
11:13
#22889
25.2M
25.20 mi15:46:434:21:2010:224:02
11:42
#22885
Finish
26.22 mi15:57:334:32:1010:2310:50
10:38
#22893
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi210388394839422928(Top 86%)9302(Top 81%)9302(Top 190%)
10K6.21 mi3.10 mi21868-8308781-3878781-38722630(Top 85%)9158(Top 80%)9158(Top 188%)
15K9.32 mi3.11 mi22230-3628953-1728953-17222928(Top 86%)9302(Top 81%)9302(Top 190%)
20K12.43 mi3.11 mi22425-1959044-919044-9122936(Top 86%)9323(Top 82%)9323(Top 191%)
Half13.11 mi0.68 mi22402+239030+149030+1421947(Top 82%)8762(Top 77%)8762(Top 179%)
25K15.53 mi2.42 mi23223-8219469-4399469-43925338(Top 95%)10700(Top 94%)10700(Top 219%)
30K18.64 mi3.11 mi23176+479474-59474-522982(Top 86%)9456(Top 83%)9456(Top 194%)
20M20.00 mi1.36 mi23101+759449+259449+2522364(Top 84%)9175(Top 80%)9175(Top 188%)
21M21.00 mi1.00 mi23069+329439+109439+1022660(Top 85%)9367(Top 82%)9367(Top 192%)
35K21.75 mi0.75 mi23015+549420+199420+1921558(Top 81%)8810(Top 77%)8810(Top 180%)
23M23.00 mi1.25 mi22935+809391+299391+2921919(Top 82%)9028(Top 79%)9028(Top 185%)
24M24.00 mi1.00 mi22895+409380+119380+1122279(Top 84%)9251(Top 81%)9251(Top 189%)
40K24.85 mi0.85 mi22889+69387-79387-722754(Top 85%)9523(Top 83%)9523(Top 195%)
25.2M25.20 mi0.35 mi22885+49385+29385+221979(Top 83%)9122(Top 80%)9122(Top 187%)
Finish26.22 mi1.02 mi22893-89395-109395-1023289(Top 87%)9796(Top 86%)9796(Top 201%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 86%
×21story building
+97ft-345ft

Overall

22928

Females

9302

F18-39

9302

5K→10K

3.1 - 6.2 mi

Top 85%
×5story building
+79ft-138ft

Overall

22630

Females

9158

F18-39

9158

10K→15K

6.2 - 9.3 mi

Top 86%
×3story building
+67ft-78ft

Overall

22928

Females

9302

F18-39

9302

15K→20K

9.3 - 12.4 mi

Top 86%
×5story building
+106ft-86ft

Overall

22936

Females

9323

F18-39

9323

20K→Half

12.4 - 13.1 mi

Top 82%
×2story building
+19ft-37ft

Overall

21947

Females

8762

F18-39

8762

Half→25K

13.1 - 15.5 mi

Top 95%
×4story building
+66ft-88ft

Overall

25338

Females

10700

F18-39

10700

25K→30K

15.5 - 18.6 mi

Top 86%
×9story building
+181ft-148ft

Overall

22982

Females

9456

F18-39

9456

30K→20M

18.6 - 20.0 mi

Top 84%
×5story building
+64ft-50ft

Overall

22364

Females

9175

F18-39

9175

20M→21M

20.0 - 21.0 mi

Top 85%
×8story building
+106ft-24ft

Overall

22660

Females

9367

F18-39

9367

21M→35K

21.0 - 21.8 mi

Top 81%
×7story building
+17ft-86ft

Overall

21558

Females

8810

F18-39

8810

35K→23M

21.8 - 23.0 mi

Top 82%
×5story building
+23ft-63ft

Overall

21919

Females

9028

F18-39

9028

23M→24M

23.0 - 24.0 mi

Top 84%
×6story building
+12ft-82ft

Overall

22279

Females

9251

F18-39

9251

24M→40K

24.0 - 24.9 mi

Top 85%
×1story
+6ft-20ft

Overall

22754

Females

9523

F18-39

9523

40K→25.2M

24.9 - 25.2 mi

Top 83%
×1story
+13ft-16ft

Overall

21979

Females

9122

F18-39

9122

25.2M→Finish

25.2 - 26.2 mi

Top 87%
×2story building
+22ft-21ft

Overall

23289

Females

9796

F18-39

9796

Passing Analysis

Category:
Athletes Passed
843
Passed By
2698
Net Change
-1855
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21038
5K → 10K50880-830#21038#21868
10K → 15K63425-362#21868#22230
15K → 20K81276-195#22230#22425
20K → Half3613+23#22425#22402
Half → 25K10831-821#22402#23223
25K → 30K14497+47#23223#23176
30K → 20M9419+75#23176#23101
20M → 21M6735+32#23101#23069
21M → 35K606+54#23069#23015
35K → 23M9515+80#23015#22935
23M → 24M6020+40#22935#22895
24M → 40K4135+6#22895#22889
40K → 25.2M1713+4#22889#22885
25.2M → Finish2533-8#22885#22893
TOTALS8432698-1855
📊

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