We consider the impact on the study of normal stars of large‐scale pointed and mapping observations at 3.6 μm and 4.5 μm with the Spitzer IRAC imager. Deep observations at these wave‐lengths are particularly sensitive to very cool stellar and substellar objects, both as companions to other stars and in the field. A wide‐angle survey can be expected to detect 50–100 cool T dwarfs and up to 5 “Y” dwarfs in the field, and AGB stars throughout the Galactic halo. Pointed observations of white dwarfs at these wavelengths will be sensitive to unresolved cool companions and to circumstellar dust disk remnants of planetary system objects. The cumulative photometry of normal stars in the imaging fields will be invaluable for understanding stellar colors and atmospheres.