Warmerdam peonies will be opening on February 17. It's already early morning oh the 17th there, so it's very hard to know what time they will open.
They have a new website, so I had to register for an account again since I haven't ordered in 2 years. If you think you might want to order, I would get that part done while the website is closed to get ready for orders. I can remember when the website has crashed before.