Down here, we just ride through the winter. Or lots of us do, at least.

I see some forumites here and else where from the Denver area, and some of them ride year round. When we lived up there, I noticed that I would see lots of mountain bikes in one park I hiked in, but then the first time it snowed a half inch, you didn't see any more that fall, no matter how pretty it was. So I think one moral is to take advantage of good weather when it happens, and don't just assume that you can ride in this month and not that month.

When we lived in CO, I wasn't into biking, but I was into hiking. I found I could still do a lot of that, plus do snowshoeing in the winter. Great fun for me. We lived within easy driving distance of Rocky Mountain National Park. If you have opportunities to snowshoe or cross-country-ski, you can work a lot of the same muscles you use cycling. I would much rather do something outdoors than indoors for exercise.