According to the U.S. Census Bureau, the county has a total area of , of which are land and (0.5%) are covered by water. Ector County has an average rainfall of about 14 in per year and a warm, sunny, semiarid climate. Most of the county is relatively flat, with small areas of slightly rolling terrain. The area is known for its stark landscape. The few naturally occurring trees are mostly mesquite trees, which more resemble large bushes.
