I hope this helps. I just checked my Bonnie binder. :-) Part 2 of Roll, Roll, Cotton Boll from 2 years ago posted on Friday, Nov. 26. Part 1 would have been posted the week before. Her intro with the yardage requirements would have been a week (?) or two(?) before that.
Looks like last year's Orca Bay print-outs are buried in my sewing room somewhere and I'm too tired to look, but definitely November again. I almost didn't do that one because her suggested colors were black, red, and blue with neutrals...just didn't sound like me. I am so glad I did it.
I really am looking forward to this year's mystery. I'm starting to associate this as a holiday treat-- I'm a teacher so am able to make some real progress while home over Thanksgiving and Christmas, but usually don't get the top completed until later in the spring.