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Hi Tony,Welcome - I had the same question (what's my "zone") but with a bit of google search discovered that I am in zone 12 (http://www.backyardgardener.com/zone/africa.html)...
Welcome Tony. USDA zones do go above 11. Go to this map and click on Puerto Rico or Hawaii for a look at zones up to 13b. 11b would be about right for you.http://planthardiness.ars.usda.gov/PHZMweb/default.aspx