Boston Marathon logo
BOSTON MARATHON 2025

Stacy Smyth

Bib: 23163•F

DE

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F45-49)
#0 / 1813
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
8:37/mi
26:45
↑ 97↓ 3451.5%
10K· 6.21 mi
8:50/mi
54:11
↑ 79↓ 1380.4%
15K· 9.32 mi
8:48/mi
1:21:30
↑ 67↓ 78
20K· 12.43 mi
8:56/mi
1:49:15
↑ 106↓ 860.1%
Half· 13.11 mi
8:52/mi
1:55:18
↑ 19↓ 370.5%
25K· 15.53 mi
9:19/mi
2:17:54
↑ 66↓ 880.2%
30K· 18.64 mi
9:35/mi
2:47:39
↑ 181↓ 1480.2%
20M
13:15/mi
3:05:39
↑ 64↓ 500.2%
21M
10:42/mi
3:16:21
↑ 106↓ 241.6%
35K· 21.75 mi
10:18/mi
3:24:03
↑ 17↓ 861.7%
23M
10:33/mi
3:37:16
↑ 23↓ 630.6%
24M
11:47/mi
3:49:03
↓ 821.3%
40K· 24.85 mi
11:22/mi
3:58:46
↓ 200.3%
25.2M
11:39/mi
4:02:47
↑ 13↓ 160.2%
Finish· 26.22 mi
10:26/mi
4:13:25
↑ 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
Time1:55:18
Pace8:48 /mi
2nd Half
Distance13.11 mi
Time2:18:07
Pace10:32 /mi
📊Positive Split: 19.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:24:0926:458:3726:45
8:37
-
10K
6.21 mi11:51:3554:118:4327:26
8:50
+0:13
15K
9.32 mi12:18:541:21:308:4527:19
8:48
-0:02
20K
12.43 mi12:46:391:49:158:4727:45
8:56
+0:08
Half
13.11 mi12:52:421:55:188:486:03
8:52
-0:04
25K
15.53 mi13:15:182:17:548:5322:36
9:19
+0:27
30K
18.64 mi13:45:032:47:399:0029:45
9:35
+0:16
20M
20.00 mi14:03:033:05:399:1718:00
13:15
+3:40
21M
21.00 mi14:13:453:16:219:2110:42
10:42
-2:33
35K
21.75 mi14:21:273:24:039:237:42
10:18
-0:24
23M
23.00 mi14:34:403:37:169:2713:13
10:33
+0:15
24M
24.00 mi14:46:273:49:039:3311:47
11:47
+1:14
40K
24.85 mi14:56:103:58:469:369:43
11:22
-0:25
25.2M
25.20 mi15:00:114:02:479:384:01
11:39
+0:17
Finish
26.22 mi15:10:494:13:259:4010:38
10:26
-1:13

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

8:37 /mi

Average Pace

9:40 /mi

Slowest Pace

13:15 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:47:39

66% of race

Time at Steady Pace

42:15

17% of race

Time at Slower Pace

43:31

17% of race

Average Pace: 9:40 /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 mi11:24:0926:458:3726:45
8:37
#20529
10K
6.21 mi11:51:3554:118:4327:26
8:50
#21004
15K
9.32 mi12:18:541:21:308:4527:19
8:48
#20974
20K
12.43 mi12:46:391:49:158:4727:45
8:56
#20881
Half
13.11 mi12:52:421:55:188:486:03
8:52
#20908
25K
15.53 mi13:15:182:17:548:5322:36
9:19
#20988
30K
18.64 mi13:45:032:47:399:0029:45
9:35
#20841
20M
20.00 mi14:03:033:05:399:1718:00
13:15
#21801
21M
21.00 mi14:13:453:16:219:2110:42
10:42
#21721
35K
21.75 mi14:21:273:24:039:237:42
10:18
#21780
23M
23.00 mi14:34:403:37:169:2713:13
10:33
#21783
24M
24.00 mi14:46:273:49:039:3311:47
11:47
#22002
40K
24.85 mi14:56:103:58:469:369:43
11:22
#22100
25.2M
25.20 mi15:00:114:02:479:384:01
11:39
#22100
Finish
26.22 mi15:10:494:13:259:4010:38
10:26
#22168
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi205297824782421001(Top 74%)8005(Top 65%)8005(Top 442%)
10K6.21 mi3.10 mi21004-4758058-2348058-23421562(Top 76%)8350(Top 68%)8350(Top 461%)
15K9.32 mi3.11 mi20974+308028+308028+3021001(Top 74%)8005(Top 65%)8005(Top 442%)
20K12.43 mi3.11 mi20881+937970+587970+5820641(Top 73%)7861(Top 64%)7861(Top 434%)
Half13.11 mi0.68 mi20908-277982-127982-1221294(Top 75%)8208(Top 67%)8208(Top 453%)
25K15.53 mi2.42 mi20988-808031-498031-4921279(Top 75%)8255(Top 68%)8255(Top 455%)
30K18.64 mi3.11 mi20841+1478009+228009+2220259(Top 71%)7802(Top 64%)7802(Top 430%)
20M20.00 mi1.36 mi21801-9608527-5188527-51826682(Top 94%)11391(Top 93%)11391(Top 628%)
21M21.00 mi1.00 mi21721+808504+238504+2320618(Top 73%)8259(Top 68%)8259(Top 456%)
35K21.75 mi0.75 mi21780-598562-588562-5822679(Top 80%)9378(Top 77%)9378(Top 517%)
23M23.00 mi1.25 mi21783-38595-338595-3322163(Top 78%)9151(Top 75%)9151(Top 505%)
24M24.00 mi1.00 mi22002-2198738-1438738-14325387(Top 89%)10817(Top 88%)10817(Top 597%)
40K24.85 mi0.85 mi22100-988813-758813-7523898(Top 84%)10117(Top 83%)10117(Top 558%)
25.2M25.20 mi0.35 mi221008822-98822-922464(Top 79%)9387(Top 77%)9387(Top 518%)
Finish26.22 mi1.02 mi22168-688875-538875-5324145(Top 85%)10239(Top 84%)10239(Top 565%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 74%
×21story building
+97ft-345ft

Overall

21001

Females

8005

F45-49

8005

5K→10K

3.1 - 6.2 mi

Top 76%
×5story building
+79ft-138ft

Overall

21562

Females

8350

F45-49

8350

10K→15K

6.2 - 9.3 mi

Top 74%
×3story building
+67ft-78ft

Overall

21001

Females

8005

F45-49

8005

15K→20K

9.3 - 12.4 mi

Top 73%
×5story building
+106ft-86ft

Overall

20641

Females

7861

F45-49

7861

20K→Half

12.4 - 13.1 mi

Top 75%
×2story building
+19ft-37ft

Overall

21294

Females

8208

F45-49

8208

Half→25K

13.1 - 15.5 mi

Top 75%
×4story building
+66ft-88ft

Overall

21279

Females

8255

F45-49

8255

25K→30K

15.5 - 18.6 mi

Top 71%
×9story building
+181ft-148ft

Overall

20259

Females

7802

F45-49

7802

30K→20M

18.6 - 20.0 mi

Top 94%
×5story building
+64ft-50ft

Overall

26682

Females

11391

F45-49

11391

20M→21M

20.0 - 21.0 mi

Top 73%
×8story building
+106ft-24ft

Overall

20618

Females

8259

F45-49

8259

21M→35K

21.0 - 21.8 mi

Top 80%
×7story building
+17ft-86ft

Overall

22679

Females

9378

F45-49

9378

35K→23M

21.8 - 23.0 mi

Top 78%
×5story building
+23ft-63ft

Overall

22163

Females

9151

F45-49

9151

23M→24M

23.0 - 24.0 mi

Top 89%
×6story building
+12ft-82ft

Overall

25387

Females

10817

F45-49

10817

24M→40K

24.0 - 24.9 mi

Top 84%
×1story
+6ft-20ft

Overall

23898

Females

10117

F45-49

10117

40K→25.2M

24.9 - 25.2 mi

Top 79%
×1story
+13ft-16ft

Overall

22464

Females

9387

F45-49

9387

25.2M→Finish

25.2 - 26.2 mi

Top 85%
×2story building
+22ft-21ft

Overall

24145

Females

10239

F45-49

10239

Passing Analysis

Category:
Athletes Passed
1295
Passed By
2934
Net Change
-1639
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20529
5K → 10K109584-475#20529#21004
10K → 15K206176+30#21004#20974
15K → 20K226133+93#20974#20881
20K → Half3057-27#20881#20908
Half → 25K117197-80#20908#20988
25K → 30K291144+147#20988#20841
30K → 20M5965-960#20841#21801
20M → 21M12141+80#21801#21721
21M → 35K2887-59#21721#21780
35K → 23M7376-3#21780#21783
23M → 24M11230-219#21783#22002
24M → 40K22120-98#22002#22100
40K → 25.2M26260#22100#22100
25.2M → Finish3098-68#22100#22168
TOTALS12952934-1639
📊

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