Question: are bismarck palms cold hardy?
Answer: Bismarck palms are considered to be hardy down to about 30°F or USDA cold hardiness zone 10A (see http://planthardiness.ars.usda.gov/PHZMWeb/), but often survive in protected sites in zone 9B (25°F). This species is not as resistant to windstorm damage as most other species of palms.