Toads have a limited ability to smell, so deterrents based on the sense of smell are not effective. To deter a toad, eliminate any habitats suitable for a toad or any elements that a toad finds attractive.
Toads like to live in damp, dark places. Eliminating brush piles, wood piles and potted plants helps to deter toads. Frogs and toads like living near water, so any water sources should be removed or fenced off to keep them out. Leaving outside lights on at night attracts insects, which toads eat, so turning all outside lights off minimizes the area as a source of food. Another way to get rid of toads is to remove and relocate them to a suitable area at least half a mile away from the home.