In 327 days · Sat, Sep 11, 2027
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Saturday, September 11th, 2027
Chesapeake and Ohio Canal Towpath, Williamsport MD
Marathon · Half · 10K
62–80°F · some rain risk
See last 10 years
On this date: rain 2 of the last 10 years
2025
58–82°F
dry
2024
60–80°F
dry
2023
61–84°F
dry
2022
66–80°F
rain
2021
60–88°F
dry
2020
63–73°F
dry
2019
70–91°F
dry
2018
65–77°F
rain
2017
56–76°F
dry
2016
63–82°F
dry
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Race-day forecast · Saturday, Sep 11
Cloudy · 64–83°F
Saturday, Sep 11starts near 64°F · 42% chance of rain · wind up to 12 mph
About this race
What: 6th Annual Lock 2 Lock Marathon, Half Marathon and 10K
When: Saturday, September 11, 2027
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! 2027 times can be used for 2028.
The course certification number is MD22006NP.
Marathon – race details
https://www.strava.com/routes/3038509126320956732 Course Map
The race will start at 7:30 a.m. on September 11, 2027. 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. 11, 2027. 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. 11, 2027. 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.
Course map
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