The IRAC Dark Field was chosen to lie within the Spitzer Continuous Viewing Zone (CVZ). Spitzer lies in an Earth-trailing orbit. That is, it orbits the Sun at a distance of roughly 1AU. Although it is continuously trailing the Earth, getting further and further away (eventually it will go all the way around the Sun).

The northern CVZ was selected to make it easier to acquire ancillary data in the region.

Because it was selected to be free of bright near-infrared and mid-infrared sources, the Dark Field is fundamentally within a "void", and the number counts within the region reflect a paucity of nearby stars or galaxies.