from that herpeton webpage:
Individuals overwinter underground below the frost line in burrows they excavate or in mammal burrows.
After the breeding season, adults spend most of their time in underground burrows and cavities, making them difficult to find during the summer and fall. Tiger Salamanders are opportunistic predators and eat a wide variety of insects, spiders, worms and other terrestrial invertebrates, as well as small vertebrates such as mice.
hmmm, maybe you can train them to keep the local rodent population down?