"Will I be able to use some of the garlic immediately or does it need to be 100% cured before it will be good to use?"

You can use it immediately if you want. Curing is only done to make sure that it stores well.

"If so, assuming a harvest date of early July, when would the earliest I could use the garlic?"

As soon as you wash off the dirt.

Awesome, thanks so much for the reply. So far, I'm loving the process of growing garlic - and the fact that I can make use of my garden in the fall, winter, and very early spring when it would usually be barren. There's still some snow on the ground and I already see my garlic coming to life, it gives me delusions that may, just maybe, spring isn't too far off.

If my harvest is good, I'll add another variety or two to the list and start growing some onions as well. My understanding is that of garlic and onions, garlic is the easier one in my season / climate - so I wanted to start there first.

Thanks again.

I think uncured garlic tastes a little different, though. And the cloves might not come apart very easily because the wrappers between them haven't dried out yet (if they come apart at all).

It's tasty, though. Just might not be what you're used to.

Garlics can be used just like onions at different stages.
At younger stage you would use it just like scallions, green onions, from top to bottom. They sell them like that in Asian markets all the time.