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BOSTON MARATHON 2025

Tammy Chow

Bib: 16290•F

CA

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 37%
Division (F18-39)
#0 / 5469
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:39
Rank: #10296
Start → 5K
22:39 | 7:17/mi
10K· 6.21 mi
45:29
Rank: #10515 (-219)
5K → 10K
22:50 | 7:21/mi
15K· 9.32 mi
1:08:36
Rank: #10724 (-209)
10K → 15K
23:07 | 7:26/mi
20K· 12.43 mi
1:31:42
Rank: #10583 (+141)
15K → 20K
23:06 | 7:26/mi
Half· 13.11 mi
1:36:44
Rank: #10572 (+11)
20K → Half
5:02 | 7:23/mi
25K· 15.53 mi
1:55:07
Rank: #10554 (+18)
Half → 25K
18:23 | 7:35/mi
30K· 18.64 mi
2:19:46
Rank: #10573 (-19)
25K → 30K
24:39 | 7:56/mi
20M
2:30:52
Rank: #10637 (-64)
30K → 20M
11:06 | 8:10/mi
21M
2:39:48
Rank: #10750 (-113)
20M → 21M
8:56 | 8:56/mi
35K· 21.75 mi
2:45:57
Rank: #10844 (-94)
21M → 35K
6:09 | 8:13/mi
23M
2:56:59
Rank: #11092 (-248)
35K → 23M
11:02 | 8:49/mi
24M
3:05:41
Rank: #11307 (-215)
23M → 24M
8:42 | 8:42/mi
40K· 24.85 mi
3:14:39
Rank: #11958 (-651)
24M → 40K
8:58 | 10:29/mi
25.2M
3:19:52
Rank: #12610 (-652)
40K → 25.2M
5:13 | 15:08/mi
Finish· 26.22 mi
3:34:13
Rank: #14348 (-1738)
25.2M → Finish
14:21 | 14:05/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:36:44
Pace7:23 /mi
2nd Half
Distance13.11 mi
Time1:57:29
Pace8:58 /mi
📊Positive Split: 21.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:56:0122:397:1722:39
7:17
-
10K
6.21 mi11:18:5145:297:1922:50
7:21
+0:04
15K
9.32 mi11:41:581:08:367:2223:07
7:26
+0:05
20K
12.43 mi12:05:041:31:427:2323:06
7:26
0:00
Half
13.11 mi12:10:061:36:447:235:02
7:23
-0:03
25K
15.53 mi12:28:291:55:077:2518:23
7:35
+0:12
30K
18.64 mi12:53:082:19:467:3024:39
7:56
+0:21
20M
20.00 mi13:04:142:30:527:3311:06
8:10
+0:14
21M
21.00 mi13:13:102:39:487:378:56
8:56
+0:46
35K
21.75 mi13:19:192:45:577:386:09
8:13
-0:43
23M
23.00 mi13:30:212:56:597:4211:02
8:49
+0:36
24M
24.00 mi13:39:033:05:417:448:42
8:42
-0:07
40K
24.85 mi13:48:013:14:397:508:58
10:29
+1:47
25.2M
25.20 mi13:53:143:19:527:565:13
15:08
+4:39
Finish
26.22 mi14:07:353:34:138:1114:21
14:05
-1:03

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

7:17 /mi

Average Pace

8:11 /mi

Slowest Pace

15:08 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

3:05:41

87% of race

Time at Slower Pace

28:32

13% of race

Average Pace: 8:10 /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 mi10:56:0122:397:1722:39
7:17
#10296
10K
6.21 mi11:18:5145:297:1922:50
7:21
#10515
15K
9.32 mi11:41:581:08:367:2223:07
7:26
#10724
20K
12.43 mi12:05:041:31:427:2323:06
7:26
#10583
Half
13.11 mi12:10:061:36:447:235:02
7:23
#10572
25K
15.53 mi12:28:291:55:077:2518:23
7:35
#10554
30K
18.64 mi12:53:082:19:467:3024:39
7:56
#10573
20M
20.00 mi13:04:142:30:527:3311:06
8:10
#10637
21M
21.00 mi13:13:102:39:487:378:56
8:56
#10750
35K
21.75 mi13:19:192:45:577:386:09
8:13
#10844
23M
23.00 mi13:30:212:56:597:4211:02
8:49
#11092
24M
24.00 mi13:39:033:05:417:448:42
8:42
#11307
40K
24.85 mi13:48:013:14:397:508:58
10:29
#11958
25.2M
25.20 mi13:53:143:19:527:565:13
15:08
#12610
Finish
26.22 mi14:07:353:34:138:1114:21
14:05
#14348
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi102961951195111271(Top 40%)2520(Top 21%)2520(Top 46%)
10K6.21 mi3.10 mi10515-2192063-1122063-11210765(Top 38%)2196(Top 18%)2196(Top 40%)
15K9.32 mi3.11 mi10724-2092193-1302193-13011271(Top 40%)2520(Top 21%)2520(Top 46%)
20K12.43 mi3.11 mi10583+1412143+502143+5010229(Top 36%)2078(Top 17%)2078(Top 38%)
Half13.11 mi0.68 mi10572+112135+82135+810777(Top 38%)2342(Top 19%)2342(Top 43%)
25K15.53 mi2.42 mi10554+182158-232158-2310643(Top 37%)2407(Top 20%)2407(Top 44%)
30K18.64 mi3.11 mi10573-192243-852243-8510928(Top 38%)2747(Top 22%)2747(Top 50%)
20M20.00 mi1.36 mi10637-642325-822325-8211653(Top 41%)3275(Top 27%)3275(Top 60%)
21M21.00 mi1.00 mi10750-1132420-952420-9513149(Top 46%)4194(Top 34%)4194(Top 77%)
35K21.75 mi0.75 mi10844-942495-752495-7513790(Top 49%)4570(Top 37%)4570(Top 84%)
23M23.00 mi1.25 mi11092-2482664-1692664-16915191(Top 53%)5431(Top 44%)5431(Top 99%)
24M24.00 mi1.00 mi11307-2152823-1592823-15915756(Top 55%)5774(Top 47%)5774(Top 106%)
40K24.85 mi0.85 mi11958-6513197-3743197-37421895(Top 77%)9140(Top 75%)9140(Top 167%)
25.2M25.20 mi0.35 mi12610-6523529-3323529-33227233(Top 96%)11763(Top 96%)11763(Top 215%)
Finish26.22 mi1.02 mi14348-17384509-9804509-98028071(Top 99%)12117(Top 99%)12117(Top 222%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 40%
×21stories
+97ft-345ft

Overall

11271

Females

2520

F18-39

2520

5K→10K

3.1 - 6.2 mi

Top 38%
×5stories
+79ft-138ft

Overall

10765

Females

2196

F18-39

2196

10K→15K

6.2 - 9.3 mi

Top 40%
×3stories
+67ft-78ft

Overall

11271

Females

2520

F18-39

2520

15K→20K

9.3 - 12.4 mi

Top 36%
×5stories
+106ft-86ft

Overall

10229

Females

2078

F18-39

2078

20K→Half

12.4 - 13.1 mi

Top 38%
×2stories
+19ft-37ft

Overall

10777

Females

2342

F18-39

2342

Half→25K

13.1 - 15.5 mi

Top 37%
×4stories
+66ft-88ft

Overall

10643

Females

2407

F18-39

2407

25K→30K

15.5 - 18.6 mi

Top 38%
×9stories
+181ft-148ft

Overall

10928

Females

2747

F18-39

2747

30K→20M

18.6 - 20.0 mi

Top 41%
×5stories
+64ft-50ft

Overall

11653

Females

3275

F18-39

3275

20M→21M

20.0 - 21.0 mi

Top 46%
×8stories
+106ft-24ft

Overall

13149

Females

4194

F18-39

4194

21M→35K

21.0 - 21.8 mi

Top 49%
×7stories
+17ft-86ft

Overall

13790

Females

4570

F18-39

4570

35K→23M

21.8 - 23.0 mi

Top 53%
×5stories
+23ft-63ft

Overall

15191

Females

5431

F18-39

5431

23M→24M

23.0 - 24.0 mi

Top 55%
×6stories
+12ft-82ft

Overall

15756

Females

5774

F18-39

5774

24M→40K

24.0 - 24.9 mi

Top 77%
×1story
+6ft-20ft

Overall

21895

Females

9140

F18-39

9140

40K→25.2M

24.9 - 25.2 mi

Top 96%
×1story
+13ft-16ft

Overall

27233

Females

11763

F18-39

11763

25.2M→Finish

25.2 - 26.2 mi

Top 99%
×2stories
+22ft-21ft

Overall

28071

Females

12117

F18-39

12117

Passing Analysis

Category:
Athletes Passed
1257
Passed By
5308
Net Change
-4052
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10296
5K → 10K181400-219#10296#10515
10K → 15K105314-209#10515#10724
15K → 20K23089+141#10724#10583
20K → Half3928+11#10583#10572
Half → 25K178160+18#10572#10554
25K → 30K227245-19#10554#10573
30K → 20M96160-64#10573#10637
20M → 21M69182-113#10637#10750
21M → 35K37131-94#10750#10844
35K → 23M48296-248#10844#11092
23M → 24M39254-215#11092#11307
24M → 40K7658-651#11307#11958
40K → 25.2M1653-652#11958#12610
25.2M → Finish01738-1738#12610#14348
TOTALS12575308-4052
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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