Disney's theme parks in the United States remain closed, after first shutting the doors in March due to the COVID-19 (coronavirus) pandemic. In fact, the only park the company has reopened thus far is Shanghai Disneyland in China. While plans for reopening them have not been announced, Disneyland and Disney California Adventure are at least one step closer to welcoming guests again.
According to the OC Register, the state of California has decided theme parks will be able to open once again during Stage 3 of the government's four-stage process to reopening the economy. Of course, that's dependent on the state's COVID-19 infection rate remaining stable.
As for when that will happen, California governor Gavin Newsom hinted earlier in May that could happen sooner than you expect. "Phase 3 is not a year away. It’s not six months away. It’s not even three months away. It may not even be more than a month away," he previously said during a press briefing. "We just want to make sure we have a protocol in place to secure customer safety, employee safety and allow the businesses to thrive in a way that is sustainable."
Newsom has pointed to June 3 as a potential date for shifting into Stage 3.
Disneyland and Disney California Adventure aren't the only theme parks that would be allowed to open under Stage 3. Others, like Universal Studios Hollywood, Knott's Berry Farm, Magic Mountain, and Legoland would also fall into that category. Thus far, none of those parks have announced any plans for reopening.
In fact, the only major domestic theme parks that are currently scheduled to open are those at the Universal Orlando Resort--Universal Studios Orlando, Islands of Adventure, and Volcano Bay. All three parks are slated to reopen on June 5, with new guidelines in place.