It's not too late to protect your plants and gardens from snow and ice! A light dusting of snow won't do anything, but young, small plants can't hold the weight of much more than an inch of snow.
I like to spread a blend of bark chips, moss, straw, and leaves around the base of the plant as insulation--but not too high, because the stem will still need to receive moisture. In order to keep the top of your plants safe, you can use a cardboard box to cover them (removing it as soon as possible so they get light!) or a tarp weighed down at the ends. It's also a good idea to check out any young trees, especially if they lean heavily to one side naturally. Consider tying it to a nearby tree, so that the weight of the snow and ice don't cause the tree to snap. If it's safe, I think it's always a good idea to go out and shake snow and ice off of branches, so that you don't have a larger mess to deal with later.
Plant care is a year round job! And work in the winter results in a very flowering and fruitful spring and summer! (I couldn't help that, I'm so sorry!)