Recent research has actually shown that Cabernet Sauvignon is the progeny of Cabernet Franc and Sauvignon Blanc and not vice-versa, as previously believed.  Cab Franc is not the "other Cab" as we have been calling it!  Cabernet Franc is the leading variety in the St. Emilion District in France.  

Cabernet Franc made as a varietal may be less dark but is more aromatic and fruity with suggestions of raspberries, currants and herbs.   With a more moderate tannin level than Cab Sauvignon, it matures earlier for drinking and makes a great blender for Cabernet Sauvignon. 

Cabernet Franc ripens earlier than Cab Sauvignon in mid October in our Finger Lakes Wine Region of Central NYS.  It is a tender variety.  In the vineyard it tends to over crop, so care must be taken to manage the crop so the grapes can ripen fully and not result in a wine of low quality. 

We do not have Cab Franc planted in our vineyard.  The micro climate is superior in certain vineyards on Seneca Lake, so we "import" Cab Franc for our customer needs.  Cab Franc is sold as a grape only forcing the winemaker to make a bold red Vinifera wine, rather than a light red from cold pressed grapes.