USDA Hardiness Zone 9A includes central Florida, the Texas Rio Grande Valley, parts of Arizona, and inland Southern California, with average annual minimum temperatures between 20°F and 25°F. The growing season averages 273 frost-free days, from a last spring frost around Feb 28 to a first fall frost near Nov 28. Zone 9A effectively supports two distinct growing seasons: warm-season crops from March through October and cool-season crops through the mild winter. Summer heat management — shade cloth, mulching, and early-morning irrigation — is the primary challenge. 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.