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Cold Hardy Palm Trees species and cold tolerance threshold:
True Date Palm Trees (Date Palms are cold hardy to 18 degrees)

Canary Island Date Palm Trees (Canary Island Palms are cold hardy to 15 - 18 degrees)

Texas Sabal Palm Trees- (Texas Sabal Palms are cold hardy to 16 - 18 degrees)

Mediterranean Fan Palm (Mediterranean Fan Palms are cold hardy to 5 - 15 degrees)

California Fan Palm Trees (California Fan Palms are cold hardy to 15 degrees)

Windmill Palm Trees - (Windmill Palms are cold hardy to 5 degrees)

Pindo Palm Tree (Pindo Palms are cold hardy to 12 - 15 degrees)

Sago Palms - (Sago Palms are cold hardy to 20 degrees)

Mexican Fan Palm Trees (Mexican Fan Palms are cold hardy to 18 degrees)

Queen Palm Trees (Queen Palms are cold hardy to 20 degrees)

The cold weather temperatures listed above are estimates, and preventitive measures for cold protection can be taken enabling, with appropriate care, the cold hardy palm tree to grow in colder or borderline areas.

Try google images for pictures...

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