Zone 5B is a productive northern zone with a comfortable growing season. With an average last spring frost around Apr 18 and first fall frost around Oct 13, you have approximately 178 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.