USDA Hardiness Zone 4A covers much of Minnesota, Wisconsin, Montana, and northern Maine, with average annual minimum temperatures between -30°F and -25°F. The growing season has 107 frost-free days between the last spring frost on May 29 and the first fall frost on Sep 13. Most warm-season vegetables (tomatoes, peppers, squash) succeed when started indoors and transplanted after the frost date. Cool-season crops such as peas, lettuce, and radishes can be direct-sown several weeks before the last frost for an early harvest. To find your USDA zone by 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.
Zone 4A Planting Guide
Last Spring Frost
May 29
First Fall Frost
Sep 13
Growing Season
107 days
Filterable list of 100 vegetables, herbs, and flowers for Zone 4A. Each crop links to its plant page for planting dates.
Browse all 100 Zone 4A plant guides →
Jump directly to the detailed growing guide for any plant in Zone 4A.
Vegetables
Herbs
Flowers
Growing guides for Zone 4A
Hand-picked posts from the GardeningByZone blog that apply to your zone.
Printable planting calendar and worksheet
Two PDFs for the Midwest region, to print at home.
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When to plant vegetables outdoors, state by state, from each state's own extension service. IL, IN, IA, MI, MN, MO, OH, WI · Zones 3a through 8a. Printable PDF.
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Lay out beds, plan crop rotation and record planting dates, with a crop reference for the Midwest region. Printable PDF.
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