When your hands are freezing and you are cursing because you are outside wrapping your trees, that is when it the correct time to protect your plants for winter. I have been driving by homes in our neighbourhood that have had their plants wrapped since October; in my opinion that is WAY too early. When the temperatures rise frequently over freezing and the sun is still heating up the air, it is too soon. Most plants do not need to be wrapped. The reason for the extra protection is for plants that are zone 5 or higher. We do suggest wrapping plants that may have issues with wind burn and the needles drying out.
Please feel free to contact us if you have a specific question about winter protection. We are happy to help.