The foil penetration technique and metallographic cross sections were used to study the kinetics and morphology of localized corrosion in AA2024-T3 in different orientations relative to the rolling direction. The foil penetration technique measures the time for the fastest-growing localized corrosion site (pit, crevice, or intergranular attack) to penetrate foils of various thickness. The growth kinetics of localized corrosion in AA2024-T3 exhibited a strong anisotropy. Growth in the short transverse direction (through-thickness direction of a rolled plate) was found to be much slower than that in either the longitudinal or long transverse direction. The effect of microstructure occurred because pits that initiated on the surface often transformed into intergranular corrosion. The anisotropy of the microstructure in this alloy results in a vast difference in intergranular path length per nominal thickness for various orientations. However, the pitting potential of AA2024-T3 was found to be almost independent of sample orientation relative to the rolling direction.