When I tried to start my truck this morning so that I could get to work, it would not start at all. Because we had a pretty cold night here in Denver, I wondered it it might be the battery - I'm guessing not, though, since the windows, locks, stereo, and HVAC controls all still work. I did still get a click when I turned the key, though. I also noticed that it started *a little* harder recently after sitting outside during a cold night.

Keeping in mind that I'm a novice mechanic, can anyone give me some ideas? Places to start trouble shooting?

FWIW, I put a lot of miles on it yesterday and it worked fine all day.