We would recommend watering if the fall is too dry. It’s much better if it germinates now. Seed will need to be kept moist for at least a couple weeks for it to do well. To answer the question though, the seed can still germinate in the spring—the problem is with snow and rain through the winter, much of the seed can wash from where we want it to other places.
Here is a link to more turfgrass information: http://www.uky.edu/Ag/ukturf/lawns.html