Install a sheet metal fence around your yard. You need to bury the fence 3 to 4 inches into the ground and the fence should be approximately 10 inches high. Don't use materials with gaps such as mesh, as the toads can use the gaps to climb up and over the fence. Make sure to check the fence regularly. For example, if a branch falls on it, the toads could use it as a beam to climb up, over and into your yard.
Remove all debris and trash from your yard, especially things like empty flowerpots, old tires and railroad ties. Toads use these items for shelter, and without the shelter, they may not want to inhabit your yard.
Landscape your yard with plants and flowers. Toads like to live in open spaces with bare lawns.
Reduce the moisture in your yard. Toads need to drink regularly, and they also need to moisten themselves every few days. Therefore, if you have a lawn that has automatic sprinklers or standing water ponds, toads are more likely to inhabit your yard. Fence off standing water and reduce the use of sprinklers.
Turn off outdoor lights at night. Toads feed on small bugs, such as moths, that are attracted to artificial nighttime lights. By turning these lights off at night, you may be able to reduce the food source.