I've never been there. So, can anyone tell me when would be the last month of the season someone can go?
We went up in June and there was snow drifts at the top where the DH trail starts. It was cold up top, but warm when you got to the town. I'd call the Yuba Bike Shop. They run one of the shuttle services there. Here's the link: http://www.yubaexpeditions.com/pages/bikeshop.html