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BOSTON MARATHON 2025

Kirsten Kalkhurst Burbo

Bib: 23783•F

MA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F55-59)
#0 / 994
Top 50%
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
8:52/mi
27:32
↑ 97↓ 3451.5%
10K· 6.21 mi
8:54/mi
55:11
↑ 79↓ 1380.4%
15K· 9.32 mi
8:54/mi
1:22:51
↑ 67↓ 78
20K· 12.43 mi
8:58/mi
1:50:42
↑ 106↓ 860.1%
Half· 13.11 mi
9:02/mi
1:56:52
↑ 19↓ 370.5%
25K· 15.53 mi
9:04/mi
2:18:51
↑ 66↓ 880.2%
30K· 18.64 mi
9:35/mi
2:48:37
↑ 181↓ 1480.2%
20M
9:33/mi
3:01:35
↑ 64↓ 500.2%
21M
10:07/mi
3:11:42
↑ 106↓ 241.6%
35K· 21.75 mi
8:48/mi
3:18:17
↑ 17↓ 861.7%
23M
9:46/mi
3:30:31
↑ 23↓ 630.6%
24M
9:26/mi
3:39:57
↓ 821.3%
40K· 24.85 mi
10:40/mi
3:49:04
↓ 200.3%
25.2M
11:39/mi
3:53:05
↑ 13↓ 160.2%
Finish· 26.22 mi
9:51/mi
4:03:07
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:56:52
Pace8:55 /mi
2nd Half
Distance13.11 mi
Time2:06:15
Pace9:38 /mi
📊Positive Split: 8.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:25:0927:328:5227:32
8:52
-
10K
6.21 mi11:52:4855:118:5327:39
8:54
+0:02
15K
9.32 mi12:20:281:22:518:5327:40
8:54
0:00
20K
12.43 mi12:48:191:50:428:5427:51
8:58
+0:04
Half
13.11 mi12:54:291:56:528:556:10
9:02
+0:04
25K
15.53 mi13:16:282:18:518:5621:59
9:04
+0:02
30K
18.64 mi13:46:142:48:379:0329:46
9:35
+0:31
20M
20.00 mi13:59:123:01:359:0512:58
9:33
-0:02
21M
21.00 mi14:09:193:11:429:0810:07
10:07
+0:34
35K
21.75 mi14:15:543:18:179:076:35
8:48
-1:19
23M
23.00 mi14:28:083:30:319:0912:14
9:46
+0:58
24M
24.00 mi14:37:343:39:579:109:26
9:26
-0:20
40K
24.85 mi14:46:413:49:049:139:07
10:40
+1:14
25.2M
25.20 mi14:50:423:53:059:154:01
11:39
+0:59
Finish
26.22 mi15:00:444:03:079:1710:02
9:51
-1:48

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

8:48 /mi

Average Pace

9:17 /mi

Slowest Pace

11:39 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:03:27

51% of race

Time at Steady Pace

1:26:23

36% of race

Time at Slower Pace

33:17

14% of race

Average Pace: 9:16 /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 mi11:25:0927:328:5227:32
8:52
#21820
10K
6.21 mi11:52:4855:118:5327:39
8:54
#21876
15K
9.32 mi12:20:281:22:518:5327:40
8:54
#21762
20K
12.43 mi12:48:191:50:428:5427:51
8:58
#21483
Half
13.11 mi12:54:291:56:528:556:10
9:02
#21513
25K
15.53 mi13:16:282:18:518:5621:59
9:04
#21289
30K
18.64 mi13:46:142:48:379:0329:46
9:35
#21087
20M
20.00 mi13:59:123:01:359:0512:58
9:33
#20939
21M
21.00 mi14:09:193:11:429:0810:07
10:07
#20774
35K
21.75 mi14:15:543:18:179:076:35
8:48
#20647
23M
23.00 mi14:28:083:30:319:0912:14
9:46
#20614
24M
24.00 mi14:37:343:39:579:109:26
9:26
#20572
40K
24.85 mi14:46:413:49:049:139:07
10:40
#20681
25.2M
25.20 mi14:50:423:53:059:154:01
11:39
#20724
Finish
26.22 mi15:00:444:03:079:1710:02
9:51
#20786
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF55-59Seg. OverallSeg. FemalesSeg. F55-59
5K3.11 mi3.11 mi218208526852621605(Top 76%)8334(Top 68%)8334(Top 838%)
10K6.21 mi3.10 mi21876-568538-128538-1221932(Top 77%)8560(Top 70%)8560(Top 861%)
15K9.32 mi3.11 mi21762+1148475+638475+6321605(Top 76%)8334(Top 68%)8334(Top 838%)
20K12.43 mi3.11 mi21483+2798309+1668309+16620795(Top 73%)7946(Top 65%)7946(Top 799%)
Half13.11 mi0.68 mi21513-308323-148323-1421988(Top 77%)8593(Top 70%)8593(Top 864%)
25K15.53 mi2.42 mi21289+2248206+1178206+11720223(Top 71%)7662(Top 63%)7662(Top 771%)
30K18.64 mi3.11 mi21087+2028133+738133+7320275(Top 71%)7811(Top 64%)7811(Top 786%)
20M20.00 mi1.36 mi20939+1488060+738060+7319377(Top 68%)7467(Top 61%)7467(Top 751%)
21M21.00 mi1.00 mi20774+1657998+627998+6218759(Top 66%)7217(Top 59%)7217(Top 726%)
35K21.75 mi0.75 mi20647+1277947+517947+5117313(Top 61%)6548(Top 54%)6548(Top 659%)
23M23.00 mi1.25 mi20614+337948-17948-119701(Top 69%)7890(Top 65%)7890(Top 794%)
24M24.00 mi1.00 mi20572+427945+37945+319398(Top 68%)7772(Top 64%)7772(Top 782%)
40K24.85 mi0.85 mi20681-1098018-738018-7322353(Top 79%)9386(Top 77%)9386(Top 944%)
25.2M25.20 mi0.35 mi20724-438053-358053-3522453(Top 79%)9376(Top 77%)9376(Top 943%)
Finish26.22 mi1.02 mi20786-628109-568109-5622452(Top 79%)9395(Top 77%)9395(Top 945%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 76%
×21story building
+97ft-345ft

Overall

21605

Females

8334

F55-59

8334

5K→10K

3.1 - 6.2 mi

Top 77%
×5story building
+79ft-138ft

Overall

21932

Females

8560

F55-59

8560

10K→15K

6.2 - 9.3 mi

Top 76%
×3story building
+67ft-78ft

Overall

21605

Females

8334

F55-59

8334

15K→20K

9.3 - 12.4 mi

Top 73%
×5story building
+106ft-86ft

Overall

20795

Females

7946

F55-59

7946

20K→Half

12.4 - 13.1 mi

Top 77%
×2story building
+19ft-37ft

Overall

21988

Females

8593

F55-59

8593

Half→25K

13.1 - 15.5 mi

Top 71%
×4story building
+66ft-88ft

Overall

20223

Females

7662

F55-59

7662

25K→30K

15.5 - 18.6 mi

Top 71%
×9story building
+181ft-148ft

Overall

20275

Females

7811

F55-59

7811

30K→20M

18.6 - 20.0 mi

Top 68%
×5story building
+64ft-50ft

Overall

19377

Females

7467

F55-59

7467

20M→21M

20.0 - 21.0 mi

Top 66%
×8story building
+106ft-24ft

Overall

18759

Females

7217

F55-59

7217

21M→35K

21.0 - 21.8 mi

Top 61%
×7story building
+17ft-86ft

Overall

17313

Females

6548

F55-59

6548

35K→23M

21.8 - 23.0 mi

Top 69%
×5story building
+23ft-63ft

Overall

19701

Females

7890

F55-59

7890

23M→24M

23.0 - 24.0 mi

Top 68%
×6story building
+12ft-82ft

Overall

19398

Females

7772

F55-59

7772

24M→40K

24.0 - 24.9 mi

Top 79%
×1story
+6ft-20ft

Overall

22353

Females

9386

F55-59

9386

40K→25.2M

24.9 - 25.2 mi

Top 79%
×1story
+13ft-16ft

Overall

22453

Females

9376

F55-59

9376

25.2M→Finish

25.2 - 26.2 mi

Top 79%
×2story building
+22ft-21ft

Overall

22452

Females

9395

F55-59

9395

Passing Analysis

Category:
Athletes Passed
2152
Passed By
1118
Net Change
+1034
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21820
5K → 10K234290-56#21820#21876
10K → 15K259145+114#21876#21762
15K → 20K33657+279#21762#21483
20K → Half2050-30#21483#21513
Half → 25K27349+224#21513#21289
25K → 30K302100+202#21289#21087
30K → 20M17325+148#21087#20939
20M → 21M19025+165#20939#20774
21M → 35K1336+127#20774#20647
35K → 23M9865+33#20647#20614
23M → 24M7533+42#20614#20572
24M → 40K22131-109#20572#20681
40K → 25.2M1356-43#20681#20724
25.2M → Finish2486-62#20724#20786
TOTALS21521118+1034
📊

Passing Visuals

Category:
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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing