With both California and Florida under Stay at Home orders, Universal has decided to close their domestic parks through at least the end of May. They had originally been closed through April 19th, but were extended due to the coronavirus situation not slowing down.
Some good news is that stats show that California has started to flatten the curve and computer models moved up its peak to April 14th, which is as soon as next week. Those projection models have the state social distancing until Mid May to complete flatten the curve. That would coincide with the time frame that Knotts and Six Flags would like to open up their parks and give Universal enough room to decide to push up the opening of its Hollywood park should the situation vastly improve by that time.
Here is the official statement from Universal below: