
Lock 2 Lock Marathon/Half Marathon/10k
The Lock 2 Lock Half Marathon offers a fast, certified course along Maryland's historic C&O Canal Towpath.
Race Date
Sep 12, 2026
Location
Williamsport, MD
Quick facts
- Date
- Saturday, September 12, 2026
- Location
- Williamsport, Maryland
- Distance
- Half marathon (13.1 mi) + 26.2 Miles, 6.2 Miles
- Course
- Out & Back
- Terrain
- Road
- USATF certified
- Not listed
- Finishers on record
- 406
Highlights
Good For
Atmosphere
Course
The Experience
The Lock 2 Lock Half Marathon, now in its 5th year, unfolds along the scenic C&O Canal Towpath in Williamsport, Maryland. This out-and-back course is designed for speed, boasting a flat profile with minimal elevation change, making it a prime candidate for personal bests and Boston Marathon qualifying attempts.
Runners will experience a unique blend of natural beauty and historical significance as they traverse the towpath. The race is supported by ample aid stations, providing essential hydration and fuel, with a convenient drop-off tarp at the start/finish for personal supplies. The event draws participants from approximately 14 states, with a growing field size that recently saw around 293 finishers, and a loyal segment of about 19% who return annually.
The half marathon starts at 8:00 a.m., with a 1:00 p.m. cutoff, ensuring a welcoming environment for a wide range of runners. The course's certification and typical winning times around 73:45 suggest a competitive yet accessible race day.
Race-provided description
What: 5th Annual Lock 2 Lock Marathon, Half Marathon and 10K When: Saturday, September 12, 2026 Where: Entirely along the C&O Canal Towpath in Williamsport, Maryland
All three races take place on the C&O Canal towpath. The start/finish area will be Lock 44 (DO NOT USE FOR PARKING). This is a BQ certified course! 2026 times can be used for 2027. The course certification number is MD22006NP. 2027 BQ Standards Marathon – race details https://www.strava.com/routes/3038509126320956732 Course Map The race will start at 7:30 a.m. on September 12, 2026. Cutoff time is 3:00 p.m. (allowing for a pace of 17 minutes and 11 seconds per mile. Runners will start near Lock 44 and travel in a generally southeasterly direction for 6.56 miles to Lock 43 (exact point to be specified, marked and staffed by event volunteers), then turn around and travel back to Lock 44. Course elevation is no more than 40 feet for the entire distance. Runners will complete this out-and-back loop twice. Aid stations will be at miles 2, 4, 6.56, 9.12, 11.12, 13.12, 15.12, 17.12, 19.68, 22.24, 24.24 and finish line. AS will be stocked with water, Gatorade Endurance, pickle juice, potato chips, and other TBD snacks. There will also be a tarp at the start/finish line where you can leave gu's, bottles, or other race day needs. Half Marathon details https://www.strava.com/routes/3038509126320956732 Course Map The race will start at 8:00 a.m. on Sept. 12, 2026. Cutoff time is 1:00 p.m. Runners will start near Lock 44 and travel in a generally southeasterly direction for 6.56 miles to about Lock 43, then turn around and run back to Lock 44. They will complete this out-and-back loop one time. Course elevation is no more than 20 feet for the entire distance.Aid stations will be at miles 2, 4, 6.56, 9.12, 11.12, and finish line. AS will be stocked with water, Gatorade Endurance, pickle juice, potato chips, and other TBD snacks. 10K details https://www.strava.com/routes/3038508438366518588 Course Map The race will start at 8:15 a.m. on Sept. 12, 2026. Cutoff time is 11:15 a.m. Runners will start near Lock 44, run 3.1 miles on the towpath towards Washington D.C., turn around and run 3.1 miles back to Lock 44. Course elevation is no more than 10 feet for the entire distance. Aid stations will be at miles 2, 4, and the finish line. AS will be stocked with water, Gatorade Endurance, pickle juice, potato chips, and other TBD snacks.
Logistics
Race Day
Saturday, September 12, 2026
Start Time
8:00 AM
Giveaway
T-Shirt
Start Location
Chesapeake and Ohio Canal Towpath, Williamsport, MD, 21795
Course Info
Course Type
Out & Back
Terrain
road
Scenery
Lake River, Park
Surface
Paved
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Quality Score
Standout644 years running
~266 finishers a year
growing or steady
19% returning runners
5 timing sources · 8 photos
runners from 14 states
winner 1:13:45
typical high 81°F
Race Day Weather
5-year historical avgStart (Low)
60°
Afternoon (High)
81°
Hot conditions — adjust pace expectations, prioritize hydration
0.1"
Precipitation
8 mph
Wind
69%
Humidity
Historical Finish Times
How 406 finishers actually crossed the line across 4 years.
Most recent
2025
Total finishers
406
Median time
2:19:35
Latest turnout
149
States
24
Turnout by year
2022–2025
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the Lock 2 Lock Marathon/Half Marathon/10k?
The Lock 2 Lock Marathon/Half Marathon/10k is held on Saturday, September 12, 2026, starting at 8:00 AM.
Where does the Lock 2 Lock Marathon/Half Marathon/10k take place?
It takes place in Williamsport, Maryland.
What distances does the Lock 2 Lock Marathon/Half Marathon/10k offer?
The half marathon (13.1 miles), plus 26.2 Miles, 6.2 Miles.
Is the Lock 2 Lock Marathon/Half Marathon/10k course flat and good for a PR?
The Lock 2 Lock Marathon/Half Marathon/10k is a ultra-flat, out & back course.
How many people run the Lock 2 Lock Marathon/Half Marathon/10k?
HalfRuns has finish records for 406 runners who have completed the Lock 2 Lock Marathon/Half Marathon/10k.
HalfRuns editorial — independent, no paid placement.
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