This morning, I was on the Monts Jura site which proudly proclaimed "We're open!"
But the devil is in the details. They only had two T-bar lifts open, not the télésiège.
Also, the prices were barely reduced from normal prices when the *entire* mountain is open. Adults 20 Euro (versus 22) and kids 16 Euro (versus 18). But, there was no half-day option. So, if you only realize it's open and get there after lunch, it's 20 Euro for only 3 hours of skiing.
It's good they're open, but man, they really don't know how to make their visitors and customers *happy* about their experience, eh?