After the tulips have fully bloomed, trim the heads off. This is typically around the beginning of May. After 4-6 weeks when the foliage and stems have turned yellow, trim these off and dig up the bulbs. Store them in a net or crate in a cool location until the fall when you can attempt to replant.
PLEASE NOTE, there is no guarantee they will regrow again as this depends on many different variables. We suggest planting new bulbs each year, which is how we do it at the farm!