Zone 9B is a warm zone where cool-season crops thrive fall through spring. With an average last spring frost around Feb 15 and first fall frost around Dec 10, you have approximately 298 frost-free days per year. Use the planting dates below to plan your garden around these key frost windows. For a personalized forecast based on your specific zip code, use our free planting calendar. Browse individual plant guides for detailed growing instructions, or explore how USDA zones work to better understand your growing conditions.