The USDA Plant Hardiness Zone Map is the standard by which gardeners can determine which plants are most likely to thrive at a location.
If you live in the US, you will need to know your planting zone in order to select the right plants for your garden.
What are First and Last Frost Dates?
Knowing your first and last frost date is key to knowing your planting season. After your last frost date, it is typically safe to start planting outdoors. At this point the likelihood of your plants getting damaged by freezing temperatures is minimal.
Find out the frost dates for your location here