A laboratory study was undertaken to investigate the effect of wet-dry (W-D) cycles on aggregate bases, namely, Meridian (M), Richard Spur (RS), and Sawyer (S), stabilized with cement kiln dust (CKD), class C fly ash (CFA), and fluidized bed ash (FBA). Cylindrical specimens were molded, cured, and subjected to W-D cycles prior to testing for resilient modulus (Mr). It was found that the Mr values for most of specimens decreased as W-D cycles increased. Sawyer aggregates stabilized with CKD, however, exhibited an increase with W-D cycles up to 8, beyond which a decrease in Mr occurred. It is believed that such a decrease/increase in Mr values may be attributed to the deceleration/acceleration of pozzolanic reactions. Laboratory observations revealed visual degradation of only Sawyer specimens stabilized with fluidized bed ash after 16 W-D cycles; no Mr tests were performed on the degraded specimens.