IN BEFORE THE BLIZZARD
Step 1: Unbury winter beater and its winter tires.
Step 2: Back review truck reeeeeally close to the garage so you can jump said winter beater. (The battery wasn't having it.)
Step 3: Start garage heater. Duh.

@stefthepef

Does that actually warm up a garage?

I had one in my house in Cincinnati to warm up the poorly insulated sun room during the winter, and it pretty much failed.

@jonhendry It won't get remove-all-coats toasty, but it makes a decent shed-a-layer dent. It's a pretty solid garage, save for some small gaps under the doors.