Hey there, Courtney!
Welcome to the Disney Parks Moms Panel, and thanks for this great question. I love that you are already beginning to plan your summer vacation to the Happiest Place on Earth, and I can't wait for you to Get Your Ears On!
You are more than welcome to purchase
Disneyland Resort theme park tickets online prior to your June arrival. If you purchase standard (Park Hopper or 1-Park Per Day) multi-day tickets online, they will expire 13 days after first day of use or January 12, 2021, whichever occurs first, without any blockout dates. Single day tickets have slightly more restrictions, because prices vary per date and season whether you purchase a Value, Regular, or Peak single day ticket. Keep in mind that certain limited-time ticket offers have their own restrictions and rules. For example, right now you can purchase
multi-day theme park tickets for as low as $70 per day with a very special offer, but these tickets expire 13 days after first use or on May 23, 2019, whichever occurs first, with blockout dates during April 14-22, 2019.
Before your trip, make sure you download the
Disneyland app. This is going to be your one-stop-shop for all things Disneyland Resort during your trip, and it's also a fantastic way to familiarize yourself with the resort before you arrive. You can view park maps, attraction wait times, Character locations, make dining reservations, and even mobile order food and beverages from Quick Service locations in both Disneyland Park and Disney California Adventure Park with this powerful little app.
I hope this helps, and please return if you have any other vacation-planning questions!
-Jennifer