Don't know when they open but I just bought a season pass from these guys;
http://skimonarch.com/index.php/ticketspasses/season-passes $209 and deals at 17 partner areas; scroll down to see them. At 70 I could have gotten free at Monarch only but want to get the partner deals. It's perfect for me. This is going to be the year that my road trip will aim to explore places where the powder falls deep and does not get tracked out by 11 AM. (I'll still spend a few days at Alta since it's in the deal.) Check out Mirkwood basin on Monarch's map.