USDA Hardiness Zone 10B covers the southern tip of Florida, Hawaii, and the warmest coastal pockets of Southern California, with average annual minimum temperatures between 35°F and 40°F. The growing season extends to approximately 350 frost-free days, with a last spring frost around Jan 15 and first fall frost near Dec 31. Frost is rare and brief. Zone 10B gardeners can grow vegetables year-round, though the peak production window for most crops is the cooler October-through-April season. Summer plantings require heat-tolerant cultivars and consistent irrigation. 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.