Where do bees go in winter?

I was wondering through my garden this morning and noticed that a couple of self-seeded tomato plants are popping their heads above ground.  That led me to suddenly think - is there enough time before autumn / winter for these tomato plants to be productive - tomatoes need an temperature or 21 - 27oC (70 -80oF) in order to germinate and be productive. But it was not only that, I suddenly thought