Zone 10B is a nearly frost-free subtropical climate ideal for tropical crops. With an average last spring frost around Jan 15 and first fall frost around Dec 31, you have approximately 350 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.