July and August are the months for harvesting garlic here in the Northeastern USA. My 9 year-old videography took this video of me harvesting our 2015 garlic crop.
The only tip I did not mention in the video was to never leave the garlic in the hot sun to dry. I prefer to hang mine from the plant stems for a few weeks. This method keeps them dry and allows good air circulation. Garlic bulbs can rot If they are put away wet and then crowded with each other.
Laslty, be sure to leave some of the dirt on your garlic bulbs.