Food habits of T. siskiyou unknown, but the closely related T. senex feeds on fungi and seeds of forbs, shrubs, and conifers.
Lines burrows with dry grass and moss.
Also uses tree nests while raising young. No data found. Uses conifer forests, especially in mature, open stands with shrubs and large-diameter logs, stumps, and snags available. May become torpid during winter months. A field guide to the mammals.