do tulips bloom only once
No, tulips bloom only once a year-but they should bloom again next year and the one after etc....
You would have to plant them in the fall. Some varieties of tulips only bloom for one or two years and then stop blooming. Here's a site that shows which ones will come back every year and perennialize or naturalize in your garden so you will have more. They also have links for bulbs that do not perennialize well.
Tulips are a finicky flower. While they are graceful and beautiful when they bloom, in many parts of the country, tulips may only last a year or two before they stop blooming.