Sierra Club Cancellations:
See cancellation policy at the Sierra Club Web site.

In past years we had a fairly strict policy of not cancelling domestic trips until 1 month prior to trip departure, because a lot of sign ups came in late.

Due to the global financial crisis in 2009, our situation is different. Every trip is being treated on a case by case basis, and we are definitely cancelling further in advance.
We will probably make cancellation decisions 2 months prior to departure.