Expect Developers to Get First Dibs
Last year, Apple released the iOS 10 beta to paid developers on June 13th, the same day as the WWDC 2016 keynote. Those signed up with the free Beta Software Program didn't gain access to the iOS 10 beta until early July. Don't be surprised if Apple does something similar this year.
We expect developers to get access to the iOS 11 beta in early June with a release for everyone else coming a few weeks later.
If you want to try the iOS 11 beta as soon as it's released you'll need to register as an iOS developer. To become a developer you need to register through Apple's website and pay an annual fee of $99.
We typically see a iOS beta developer profile appear on Reddit or other websites within a few hours that allows anyone to install the new iOS beta. We expect this to happen again with the iOS 11 developer beta.
Developers also typically get the incremental iOS betas before Beta Software Program members as well. Apple's first iOS 10.3.3 beta arrived for developers a day before everyone else got access to it.
If you'd rather not pay for access to the iOS 11 beta you should sign yourself up for the Beta Software Program. All you need is a valid Apple ID.