A car hit the post of my old portico, the roof fell and I just had the whole thing replaced.

What I am wondering is how fast must I stain, seal or paint the new cedar. I am planing on painting it, mostly because I don't like all the knots showing. Here in Chicago we just had our first snowfall and painting season won't come for 5-6 months. Will untreated cedar be ok through the winter?

Thanks for any advice.