Soil-gas radon concentrations are controlled seasonally by factors of climate and pedology. In swelling soil of the semaiarid Western United States, soil-gas radon concentrations at 100 cm depth increase in winter and spring due to increased emanation with higher soil moisture and the capping effect of surface water or ice. Increased soil mositure results from a combination of higher winter and spring precipitation and decreased insolation in fall and winter, lowering soil temperatures so that water infiltrates deeper and evaporates more slowly. Randon concentrations in soil drop markedly through the summer and fall. The increased insolation of spring and summer warms and dries the soil, limiting the amount of water that reaches 100 cm. As the soil dries, radon emanation decreases, and deep soil cracks develop. These cracks aid convective transport of soil gas, increase radon's flux into the atmosphere, and lower its concentration is soil gas. Probable controls on the distribution of uranium within the soil column include its downward leaching, its precipitation or adsoprtion onto B-horizon clays concretions, or cement, and the uranium content and mineralogy of the soil's granitic and gneissic precursors. ¿ American Geophysical Union 1990