This information is specific for Maryland and a certain USDA hardiness zone and may not apply to your local conditions. The Eastern Shore is rated at Zone 7. Few palms will survive outdoor temperatures that get to 0 degrees F. If your site is a little warmer than that, here are a few of the more cold-tolerant palms to look at: Windmill Palm (Trachycarpus fortunei), Himalayan windmill palm (Trachycarpus takil), and the Needle palm (Rhapidophyllum hystrix). They appeared to do OK in a study done in Ohio: Cold-Hardy Palms in Southwestern Ohio: Winter Damage, Mortality and Recovery
Keeping the palms in pots and providing artificial heating and wrapping could reduce winter injury, but if you really like that tropical palm, just keep it in a container and bring it inside when temperatures get below 40 degrees. If you need more palm information, check out this information from the University of Florida: Palm Production & Maintenance .
