what planting zone is ohio in
Ohio: Vegetable Planting Calendar. Planting vegetable seeds or transplants at the correct time is important to getting the most out of your garden. Knowing your first and last frost dates will help you start your vegetable seeds at the right time. Ohio is in the 5 and 6 USDA plant hardiness zones. Ohio Last & First Frost Dates. *Based on statistics there is a 10% chance that frost will occur before or after these dates. Watch your local weather for more accurate dates. Ohio on average has approximately 170 days between the last and first frost.