I just estivate my frog at room temperature and keep it that way. I doubt estivation is 100% necessary, but I just do it anyway-mostly because it's just natural. I do a similar thing for my Boa constrictor-I put her through a nonfeeding cycle in the winter, once again just because it's NATURAL. And actually healthier for the snake. I figure that this period of dormancy would also be healthy for the Budgett's frog. However, only healthy and fat frogs should be put through estivation.