Unfortunately, Wisconsin is way too cold to even consider growing palm trees. Wisconsin has a mainland atmosphere with warm summers and cold winters. It is impacted by Lakes Michigan and Superior. The normal temperature in July goes from 68°F (20°C) to 80°F (27°C). In January the normal temperature ranges from 8°F (– 13°C) to 26°F (– 3°C) contingent upon the area. 

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Parts of the northern part of the state only get 80 frost-free days per year! Other parts of the state double that figure. Wisconsin USDA zones 2b to 5a. 

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Palm Trees in Wisconsin 

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Your only real chance at enjoying palm trees here would be to have them in pots or planters and bring them inside during the winter months. Some extraordinary indoor/outdoor palms are: 

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Areca Palm Tree – Zones 9a – 11 (20 to 25 F) 

Chinese Fan Palm Tree – Zones 8a – 11 (10 to 15 F) 

Kentia Palm Tree – Zones 9b – 11 (25 to 30 F) 

Lady Palm Tree – Zones 8b – 11 (15 to 20 F)