Root Vegetable

When to Plant Garlic in Wisconsin

Plant in fall, harvest in summer. Garlic is one of the most rewarding crops for the patient gardener.

The Short Answer

In Wisconsin, soil conditions are an important factor for garlic. Rich agricultural soils in southern half. Sandy soils in central plain. Heavy clay in some lake regions. Generally fertile. Garlic can also be planted in fall, 6 weeks before your first frost.

Wisconsin Frost Dates

Your planting dates depend on which part of Wisconsin you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Wisconsin 3b, 4a May 15 - Jun 1 Sep 10 - Sep 25
Central Wisconsin 4a, 4b May 5 - May 20 Sep 20 - Oct 5
Southern Wisconsin 4b, 5a, 5b Apr 25 - May 10 Oct 1 - Oct 15

Garlic Planting Schedule for Wisconsin

Northern Wisconsin (Zones 3b, 4a)

Average last frost: May 15 - Jun 1 · Average first frost: Sep 10 - Sep 25

Fall Planting
6 wks before first frost

Central Wisconsin (Zones 4a, 4b)

Average last frost: May 5 - May 20 · Average first frost: Sep 20 - Oct 5

Fall Planting
6 wks before first frost

Southern Wisconsin (Zones 4b, 5a, 5b)

Average last frost: Apr 25 - May 10 · Average first frost: Oct 1 - Oct 15

Fall Planting
6 wks before first frost

Growing Garlic in Wisconsin

Garlic in Wisconsin's Climate

Your cold winters are garlic's secret weapon. Hardneck varieties — the type with the best flavor and those coveted scapes — actually require prolonged cold (vernalization) to form proper bulbs. Plant cloves in October, 6 weeks before the ground freezes, and mulch heavily. The cloves root before winter, sleep under snow, and explode with growth in spring. Northern gardeners grow the best garlic in America because the cold is an asset, not a limitation.

Soil Considerations for Wisconsin

Rich agricultural soils in southern half. Sandy soils in central plain. Heavy clay in some lake regions. Generally fertile. Loose, well-drained soil is especially important for garlic since the edible portion grows underground. If your soil is heavy clay, consider raised beds.

Wisconsin Climate & Growing Season

Cold winters. Warm summers. Lake Michigan moderates eastern climate. Good growing season in south. Short season in north. Garlic can handle frost well, which is an advantage in Wisconsin's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across Wisconsin: Northern Wisconsin (3b, 4a) has a last frost around May 15 - Jun 1, while Southern Wisconsin (4b, 5a, 5b) sees frost end around Apr 25 - May 10. This difference matters for garlic — adjust your planting dates to match your specific region.

Growing Tips

Plant individual cloves pointy-side up in fall, 4-6 weeks before ground freezes. Mulch heavily. Harvest when lower leaves brown.

Companion Planting

Plant garlic alongside these companions for better growth:

Tomatoes Peppers Lettuce Beets

Keep garlic away from:

Beans Peas

The Bottom Line

Garlic can be grown successfully across Wisconsin, but your exact planting dates depend on which region you're in. Northern Wisconsin gardeners should plan around a May 15 - Jun 1 last frost, while those in Southern Wisconsin can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Garlic Growing Guide National planting guide with all states Wisconsin Planting Calendar All plants for Wisconsin Garlic in Alabama Alabama planting dates Garlic in Alaska Alaska planting dates Garlic in Arizona Arizona planting dates Garlic in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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