With 50/50 antifreeze, it have no problems. That stuff is good to like 30 below zero and even after that it won't freeze rock hard like straight water will.
If its garaged, I just changing the oil and make sure theres a half tank or more gas in it. If its outside, taking the plugs out and spraying oil would help stop rust.
Mine stays in the garage, come spring, I top up the fuel bowls, pour some gas straight down the carb and fire it right up. Run it for like 5 mins, its good to go.
You might want to rock the car now and then so the tires don't get a flat spot, some guys put the car up on blocks, this way the springs are off load.