I try to bike when it's cold, though snow on the ground usually makes me not bike. I don't have studded tires, but I want to at least look at some, so I can ride through a little bit of snow. Last winter, I changed my route to more on the street, where the snow melts off.
I bought a
thin balaclava at Mark's Work Wearhouse that fits nicely under my helmet. I don't have goggles, but I do have glasses. If I wanted to ride a little bit colder, I'd probably look at getting some goggles to fit over my glasses.
I didn't ride when it got really cold either, but my shell jacket over a long sleeve T shirt was fine until about the -15 that I rode at. Cold for the first couple of minutes, but then, when you start going, you stay warm.
I've got some
louis Garneau cycling gloves that have a built in extra cover to slip over the fingers for extra warmth when I need it. For this year, I bought a
yellow cycling jacket from MEC for extra visibility.
I've got a headlight, a taillight, extra reflective tape all over my bike and helmet, 3m reflective straps around my pant legs.