No, it is not illegal to put corn out for deer in Texas. In fact, many people do it to attract deer to their property. However, there are some things to keep in mind if you do decide to put corn out for deer. First, make sure that the corn is not moldy or rotten. Deer will only eat fresh corn. Second, keep the corn in a container that deer can't get into so that other animals don't eat it. Finally, don't put too much corn out at once. Deer will only eat what they need, and if you put out too much, it will go to waste.