by 
The Curious Bag
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<h4 class="dechead">On One Hand: Poppy Seeds Can Survive the Cold Wisconsin Winter
Poppies are a cold-weather plant. The plant roots of the perennial varieties can often survive harsh winters under a layer of snow or mulch, and most poppy seeds actually prosper after waiting through a cold period. Poppies naturally reseed themselves each year before winter. The seeds, when planted in Wisconsin in the fall or winter, will begin growing as soon as it gets warm enough in the spring.
On the Other: Planting in Early Spring Is Also Acceptable
You may also plant poppies four to six weeks before the last winter frost in your area. The early spring frost and thaw cycle helps the seeds to germinate. You may get a slightly later bloom if planting in the spring.
Bottom Line
You may plant seeds in the fall, winter, or early spring, even in Wisconsin, as the seeds are hardy and cold-loving. Expect seeds to bloom earlier if they were planted in the fall, and later if they were planted in the spring.
Source:
High Country Gardens: Fall Planting Information
GardenGuides.com: How to Plant Poppy Seeds
The Bubbler: A Discussion on Poppy Planting
More Information:
Winconline Gardening: Typical Dates of Last Spring Killing Frost
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