I like to get away from the rain to ride during winter and spring. I usually go to Moab, Utah for the Skinny Tire Festival in March and Northern California in April.
I'm open to suggestions, what is going on that you'd like to share for winter - spring events?
Here's a short video of Skinny Tire Festival's ride in Arches National Park. http://www.youtube.com/watch?v=pie2XPerqF8