I wouldn't water. The topsoil might feel dry, but there is plenty of moisture deeper in the ground. It is spring in Iowa. It will rain or snow soon.
Katharina

You are a worrywart, aren't you Ramona? ;-) Take a deep breath and celebrate the fact that today is the last day of "Festival" on Iowa Public Television.

Your tulips are fine. Tulips originate from drier regions of the world and actually PREFER drier conditions. Particularly if they are hybrid tulips, you are probably only going to effectively get 2 to 3 years of blooms from them anyway. Many of the species tulips, if given conditions with sufficient drainage (read this as DRY) will multiply. However, the death knell of tulips is excessive water.

Particularly if tulips are planted in an area that gets watered by a sprinkler system, they can be very short-lived perennials. The same goes if they are in a flower bed that gets lots of additional water applied to other plants during the summer when the tulips are hiding beneath the surface. While everything else can be looking great, the tulips bulbs can quietly be rotting away beneath the surface. You never know that the bulb has disappeared until next spring when only a few tulips show up.

Welcome to Iowa!

IronBelly