USDA Hardiness Zone 5B covers portions of Kansas, Missouri, southern Ohio, and the Colorado foothills, with average annual minimum temperatures between -15ยฐF and -10ยฐF. The growing season averages 178 frost-free days, from a last spring frost around Apr 18 to a first fall frost near Oct 13. With nearly six months of frost-free weather, Zone 5B supports a wide range of vegetables, herbs, and flowers. Succession planting of cool-season crops in both spring and fall is a productive strategy, and most warm-season crops have time to produce two or more flushes. 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.