Disneyland was allowing reservations to be made as of July 1st, but now they can only be made for July 15th or later.
Here’s the update to site:

Here’s the specific update for July 15th:

This part says:
“For Guests who are interested in modifying their existing travel dates or making a new reservation for a future vacation, reservations are currently available for travel dates July 15th, 2020 and later. As always. Guests are able to modify these bookings if the Disneyland Resort opens before or after that time. Please contact the Walt Disney Travel Company for questions or modifications at (714) 520-5050.
We Anticipate heavy call volume and appreciate our Guests’ patience as we work hard to respond to all inquiries. ”
If you are planning a trip to Disneyland in the near future keep this in mind.
Source: Disneyland
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