I can not say positive, but I don't think you have anything to worry about in Tampa, The tropical do well there so the hardys should do great. The ones that I have seen down there do just fine in the coldest of your winters............
Cathy

When you say HARDY, do you mean perennial hibiscus? Perennial hibs may lose their leaves and even die back to the ground as the days get shorter, but they should come back without any problems. If you mean hardy tropical hibiscus that is an impossibility. Tropicals can be killed by prolonged exposure to cold. Winter is usually dry in your area and with well drained soil (your sand) they should struggle through a light frost or two. If you have a hard freeze you willprobably lose the tropicals. Do you remember the winter storm of 1982 when they had snow flurries in south Florida?

How can I tell the difference between Tropical and Hardy?

After a 6 year wait im sure much has changed in that period of time buttttt... A tropical will have dark waxy leaves and will typically coem in more vibrant colors---also more woody. a hardy hibiscus will be softer, the leaves will be light green-- not waxy or woody and the blooms come in red and pink and white. Cant wait to here what has changed! However tropical should do fine in your area,
I know someone who lives there and it works