Bees are vital pollinators, but they face many threats. Unknown to many, most bees spend the majority of their life as larvae, shielded from the environment only by the material they nest in and their nest cells. This project uses a sandstone-excavating bee, Anthophora pueblo, to test how nest substrates differ in their protective ability and whether or not this impacts the larvae themselves. These results have implications for how climate change may affect bees differently based on substrate.