When to Plant Garlic by USDA Zone (With Map & Timeline) 🧄 Your Regional Guide to Garlic Planting in the U.S. Garlic is one of the easiest and most rewarding crops to grow—but timing is everything. In the United States, garlic is traditionally planted in the fall, about 2 to 4 weeks before the ground freezes. This allows the garlic to establish roots before winter dormancy. But when exactly should you plant? That depends on your USDA Hardiness Zone— see guide and map here