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BOSTON MARATHON 2025

Nathan Lasselle

Bib: 2454•M

MN

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 25%
Gender (Male)
#0 / 16105
Top 38%
Division (M18-39)
#0 / 5642
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
7:02/mi
21:52
↑ 97↓ 3451.5%
10K· 6.21 mi
6:58/mi
43:32
↑ 79↓ 1380.4%
15K· 9.32 mi
7:01/mi
1:05:19
↑ 67↓ 78
20K· 12.43 mi
7:01/mi
1:27:06
↑ 106↓ 860.1%
Half· 13.11 mi
6:49/mi
1:31:45
↑ 19↓ 370.5%
25K· 15.53 mi
6:57/mi
1:48:35
↑ 66↓ 880.2%
30K· 18.64 mi
7:10/mi
2:10:51
↑ 181↓ 1480.2%
20M
7:30/mi
2:21:03
↑ 64↓ 500.2%
21M
8:02/mi
2:29:05
↑ 106↓ 241.6%
35K· 21.75 mi
7:17/mi
2:34:32
↑ 17↓ 861.7%
23M
7:54/mi
2:44:25
↑ 23↓ 630.6%
24M
7:46/mi
2:52:11
↓ 821.3%
40K· 24.85 mi
8:03/mi
2:59:04
↓ 200.3%
25.2M
8:48/mi
3:02:06
↑ 13↓ 160.2%
Finish· 26.22 mi
7:56/mi
3:10:11
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:31:45
Pace7:00 /mi
2nd Half
Distance13.11 mi
Time1:38:26
Pace7:31 /mi
📊Positive Split: 7.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:24:0721:527:0221:52
7:02
-
10K
6.21 mi10:45:4743:327:0021:40
6:58
-0:04
15K
9.32 mi11:07:341:05:197:0021:47
7:01
+0:03
20K
12.43 mi11:29:211:27:067:0121:47
7:01
0:00
Half
13.11 mi11:34:001:31:457:004:39
6:49
-0:12
25K
15.53 mi11:50:501:48:356:5916:50
6:57
+0:08
30K
18.64 mi12:13:062:10:517:0122:16
7:10
+0:13
20M
20.00 mi12:23:182:21:037:0310:12
7:30
+0:20
21M
21.00 mi12:31:202:29:057:068:02
8:02
+0:32
35K
21.75 mi12:36:472:34:327:065:27
7:17
-0:45
23M
23.00 mi12:46:402:44:257:099:53
7:54
+0:37
24M
24.00 mi12:54:262:52:117:107:46
7:46
-0:08
40K
24.85 mi13:01:192:59:047:126:53
8:03
+0:17
25.2M
25.20 mi13:04:213:02:067:143:02
8:48
+0:45
Finish
26.22 mi13:12:263:10:117:168:05
7:56
-0:52

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

6:49 /mi

Average Pace

7:16 /mi

Slowest Pace

8:48 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

43:09

23% of race

Time at Steady Pace

1:43:21

54% of race

Time at Slower Pace

43:41

23% of race

Average Pace: 7:15 /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 mi10:24:0721:527:0221:52
7:02
#8098
10K
6.21 mi10:45:4743:327:0021:40
6:58
#7892
15K
9.32 mi11:07:341:05:197:0021:47
7:01
#7803
20K
12.43 mi11:29:211:27:067:0121:47
7:01
#7557
Half
13.11 mi11:34:001:31:457:004:39
6:49
#7484
25K
15.53 mi11:50:501:48:356:5916:50
6:57
#7191
30K
18.64 mi12:13:062:10:517:0122:16
7:10
#6795
20M
20.00 mi12:23:182:21:037:0310:12
7:30
#6724
21M
21.00 mi12:31:202:29:057:068:02
8:02
#6698
35K
21.75 mi12:36:472:34:327:065:27
7:17
#6665
23M
23.00 mi12:46:402:44:257:099:53
7:54
#6737
24M
24.00 mi12:54:262:52:117:107:46
7:46
#6807
40K
24.85 mi13:01:192:59:047:126:53
8:03
#6913
25.2M
25.20 mi13:04:213:02:067:143:02
8:48
#6941
Finish
26.22 mi13:12:263:10:117:168:05
7:56
#7110
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi8098706170617688(Top 27%)6735(Top 42%)6735(Top 119%)
10K6.21 mi3.10 mi7892+2066911+1506911+1507747(Top 27%)6806(Top 42%)6806(Top 121%)
15K9.32 mi3.11 mi7803+896844+676844+677688(Top 27%)6735(Top 42%)6735(Top 119%)
20K12.43 mi3.11 mi7557+2466672+1726672+1726922(Top 24%)6148(Top 38%)6148(Top 109%)
Half13.11 mi0.68 mi7484+736616+566616+566252(Top 22%)5637(Top 35%)5637(Top 100%)
25K15.53 mi2.42 mi7191+2936392+2246392+2245932(Top 21%)5345(Top 33%)5345(Top 95%)
30K18.64 mi3.11 mi6795+3966052+3406052+3405711(Top 20%)5101(Top 32%)5101(Top 90%)
20M20.00 mi1.36 mi6724+715978+745978+747026(Top 25%)5844(Top 36%)5844(Top 104%)
21M21.00 mi1.00 mi6698+265937+415937+417500(Top 26%)5965(Top 37%)5965(Top 106%)
35K21.75 mi0.75 mi6665+335896+415896+417093(Top 25%)5745(Top 36%)5745(Top 102%)
23M23.00 mi1.25 mi6737-725913-175913-179212(Top 32%)6821(Top 42%)6821(Top 121%)
24M24.00 mi1.00 mi6807-705934-215934-219515(Top 33%)6907(Top 43%)6907(Top 122%)
40K24.85 mi0.85 mi6913-1065983-495983-4910503(Top 37%)7288(Top 45%)7288(Top 129%)
25.2M25.20 mi0.35 mi6941-285984-15984-110462(Top 37%)7154(Top 44%)7154(Top 127%)
Finish26.22 mi1.02 mi7110-1696070-866070-8612373(Top 44%)8206(Top 51%)8206(Top 145%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 27%
×21story building
+97ft-345ft

Overall

7688

Males

6735

M18-39

6735

5K→10K

3.1 - 6.2 mi

Top 27%
×5story building
+79ft-138ft

Overall

7747

Males

6806

M18-39

6806

10K→15K

6.2 - 9.3 mi

Top 27%
×3story building
+67ft-78ft

Overall

7688

Males

6735

M18-39

6735

15K→20K

9.3 - 12.4 mi

Top 24%
×5story building
+106ft-86ft

Overall

6922

Males

6148

M18-39

6148

20K→Half

12.4 - 13.1 mi

Top 22%
×2story building
+19ft-37ft

Overall

6252

Males

5637

M18-39

5637

Half→25K

13.1 - 15.5 mi

Top 21%
×4story building
+66ft-88ft

Overall

5932

Males

5345

M18-39

5345

25K→30K

15.5 - 18.6 mi

Top 20%
×9story building
+181ft-148ft

Overall

5711

Males

5101

M18-39

5101

30K→20M

18.6 - 20.0 mi

Top 25%
×5story building
+64ft-50ft

Overall

7026

Males

5844

M18-39

5844

20M→21M

20.0 - 21.0 mi

Top 26%
×8story building
+106ft-24ft

Overall

7500

Males

5965

M18-39

5965

21M→35K

21.0 - 21.8 mi

Top 25%
×7story building
+17ft-86ft

Overall

7093

Males

5745

M18-39

5745

35K→23M

21.8 - 23.0 mi

Top 32%
×5story building
+23ft-63ft

Overall

9212

Males

6821

M18-39

6821

23M→24M

23.0 - 24.0 mi

Top 33%
×6story building
+12ft-82ft

Overall

9515

Males

6907

M18-39

6907

24M→40K

24.0 - 24.9 mi

Top 37%
×1story
+6ft-20ft

Overall

10503

Males

7288

M18-39

7288

40K→25.2M

24.9 - 25.2 mi

Top 37%
×1story
+13ft-16ft

Overall

10462

Males

7154

M18-39

7154

25.2M→Finish

25.2 - 26.2 mi

Top 44%
×2story building
+22ft-21ft

Overall

12373

Males

8206

M18-39

8206

Passing Analysis

Category:
Athletes Passed
2060
Passed By
1072
Net Change
+988
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8098
5K → 10K334128+206#8098#7892
10K → 15K18798+89#7892#7803
15K → 20K27933+246#7803#7557
20K → Half763+73#7557#7484
Half → 25K2974+293#7484#7191
25K → 30K41721+396#7191#6795
30K → 20M12150+71#6795#6724
20M → 21M8761+26#6724#6698
21M → 35K6431+33#6698#6665
35K → 23M66138-72#6665#6737
23M → 24M52122-70#6737#6807
24M → 40K34140-106#6807#6913
40K → 25.2M1947-28#6913#6941
25.2M → Finish27196-169#6941#7110
TOTALS20601072+988
📊

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