From Tysons Corner take Route 7 West towards Leesburg.
Merge onto US-15/VA-7 W to Warrenton/Winchester
Take the Route 9 exit toward Hillsboro. At the end of the exit ramp, turn left and cross over bridge. At stop sign turn right onto Old Route 7, East Colonial Highway.  
Make the first left onto Canby Road.
Approximately 1.4 miles, Casanel Vineyards will be on your left.

From Winchester take Route 7 East. Take the Route 9 Exit.
At the and of teh exit ramp, turn right. At the stop sign turn right onto Old Route 7, East Colonial Highway.
Make the first left onto Canby Road.
Approximately 1.4 miles, Casanel Vineyards will be on your left.

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*Google provides alternate routes other than the recommended directions listed above.