questionsare there ways to prevent frost on car windows?

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Keep your car in the garage.

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@cengland0: Unfortunately, I live in an apartment complex and am forced to park outside :(

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My way is to live in the desert. But on those rare days when other people have frost on their windows, I do not as I keep my car parked in a carport, so the dew doesn't fall on the windows. I don't know if that would help in a more humid area where the water vapor in the air may form frost. It also keeps the even more rare snow and icicles off my car. I come into work and everyone's car looks like they drove in from Minnesota and mine is clean and dry. Mine is just a simple $150 10x20 tarp carport like this: http://tinyurl.com/84nbo82. With our high winds I had to give mine concrete overshoes (set the feet into large plastic planters filled with concrete) and duct tape the joints together. Plus I have to replace the $60 tarp a couple of times a year. But it keeps my car clean and dry, protects it from hail, and lets me get in and out of the car and get stuff out of the trunk without getting wet.

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Leave the car running for about 5 minutes or so before you head out. The engine will run much smoothly and you won't have frosting issues on windows if you leave the defroster on when you start the car.

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When I was in high school and had to leave the house at 6AM every day, I had to get creative to prevent frost build up. We had a garage, but it was so full of junk that you couldn't get a car into it. I found that taking a good sized piece of cardboard and putting it over my window the previous night seemed to keep the frost off of the window in the spots it covered. I went to Autozone and got a sun shield that collapes down small enough to put into the pouch on the back of the driver's seat. I just made sure to put it over my window each night (pinned down with the wipers) and each morning, took it off, put it away, started the car and drove away with no frost on the window.

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I live in Florida and we do get frost. Got frost on the cars last week as a matter of fact.
We live in a quiet neighborhood without too many "problem people" so this works for the cars that aren't parked in the garage: Towels placed at night over the front and back windshields.
If it's a hard frost, the kids start their cars, turn on the window defrosters and remove the towels in about 3 or 4 minutes once the interior is warm. When it's only a light coating of frost, they can immediately remove the towels and drive. Works like a charm. Hardest thing is to get them to not throw the towels on the lawn.

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Sometimes frost in the winter is actually building up from the inside (your interior is humid). Sometimes an anti-fog preventer (gel type) will keep fog from building up, then when the temp drops prevent frost from the interior.

http://www.c-clearantifog.com/gelcups.php

I recall that my last oil change came with a complementary treatment of Rain-X on my windshield, and I personally thought I did not have too much de-frosting issues for about a week. Maybe that is worth a try.

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There are covers available for your windows (or you can even just use old bath towels) to lay on the windows. Pull them off in the morning before driving!

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A light coat of Vaseline or Pam will keep the frost of your windows.

It will make visibility an issue, though.

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@mtm2: Where I live I think people would do just as well to drive with the towels covering their windshields, as they drive like total buffoons anyways.

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Three parts vinegar, one part water. Spray it on your windshields the night before, and voilà! No ice the next morning! Also if your locks are frozen, squirt some hand sanitizer on the lock and it should melt away.

http://www.coffeebreakwithlizandkate.com/betcha-didnt-know-how-to-ice-proof-your-car-windows

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@matt1976: that's also a good prank to play on people...shame on you

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Thanks for the thoughts so far. My winter car doesn't get to park inside, and it's gotten bad enough (perhaps due to ambient humidity) that after scraping the ice, there's still a bunch of ice/condensation left on the outside of the windows. I'll have to try some of these; the alternative of turning on the car 10 mins before leaving is not entirely appealing to someone as cheap as myself (although it is cheaper than an accident)

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I have successfully used towels pinned under the windshield wipers. If you get ratty old towels or cheapies they won't likely be stolen. It hasn't seemed to matter how thin my towels are