Edelweiss should still be open on weekends. I'm assuming most hills are closed during nights and some weekdays, but most should still be open for another weekend or two.
Take a look at http://www.skiottawa.com/ that site always has up to date information on the hills. I think a few of em are still open, but the parks are all gone and im not surprised, all the snow is pretty much gone.
im gonna try to sneek a ski day in next weekend to avila, hope they have a good jump to try 360's off of i wanted to try one before the season was over.