well i got to mt.hood on october 30, and skied most of november (lifts started running every day around nov 20th, but before it was weekends and hiking the snowfield).. From then till now you could ski lift accessed stuff everyday until late August or early September.
So thats half of November and all of Dec, Jan, Feb, Mar, Apr, May, June, July, Aug.. Thats 9 months straight.. TONS of pow in the winter and slush in the summer but its still skiing even in the summer. And in September and October the lifts are open on the weekends, and you can hike the snowfield if you want to on the weekdays or for when they shut down
So you can ski every day of the year iat Mt.Hood. Yeah if you hike the snowfield you might only get one run in, but you can also build a jump or jib if you really want to,
Plus parks are open generally from December until late August, so thats 9 months of Park! and the other three months are up to you.
Mt.Hood rocks..