It has been very cold dropping to 24F one morning. Fortunately the vines are dormant, that kind of temperature would be curtains for budding grapes unless you had overhead sprinklers, which we don’t have.
The large blowers, which we have , and the fencing to direct the flow of cold air would most certainly be inadequate. Normally in the spring we deal with temperatures no lower than 29-30F and even with these temperatures much depends on good luck.
Meanwhile we are beginning to use our automatic pre-pruner in the highest blocks, least susceptible to frost. The image is Enrique getting ready to move the pruner.