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grapevines can handle -6 Fahrenheit (i.e. -21 Celsius). If your Cabernet Franc are grafted maybe a bit lower. What are you growing and why?
No Cab here. I’m in Northern Wisconsin. I have all northern hybrids. Marquette, Petite Pearl, Frontenac, Itasca, and Brianna.

It’s not the low temps that bother me it’s the -12F to 45F in a week… and there is lots of winter left so we could be below zero again soon.
 
In central Maryland we were at 9 degrees a week ago and 74 on Friday. I was a little concerned about our cab franc because the buds got fuzzy and look like they swelled a bit. If we get another warm spell, we will probably prune to try and stunt them till temps go back down.
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In central Maryland we were at 9 degrees a week ago and 74 on Friday. I was a little concerned about our cab franc because the buds got fuzzy and look like they swelled a bit. If we get another warm spell, we will probably prune to try and stunt them till temps go back down.
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Have the same problem here in Southern Ohio. Last year was a warm late winter/spring, then we had a 22 degree night in late May. Lost all apples, plums, and pears as all the fruit had set already. Vines took a hard hit as well and I even had a couple that died. Zone here is supposed to be a 6A/B, but i only pick varieties that are 5 and colder. Tried grafted Cab Franc, but they all died over 3 years due to the unpredictable springs. They do not like to freeze after they bud out.
 
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