An analysis of hydrologic variability in Colombia shows different seasonal effects associated with El Ni¿o/Southern Oscillation (ENSO) phenomenon. Spectral and cross-correlation analyses are developed between climatic indices of the tropical Pacific Ocean and the annual cycle of Colombia's hydrology: precipitation, river flows, soil moisture, and the Normalized Difference Vegetation Index (NDVI). Our findings indicate stronger anomalies during December-February and weaker during March--May. The effects of ENSO are stronger for streamflow than for precipitation, owing to concomitant effects on soil moisture and evapotranspiration. We studied time variability of 10-day average volumetric soil moisture, collected at the tropical Andes of central Colombia at depths of 20 and 40 cm, in coffee growing areas characterized by shading vegetation (shaded coffee), forest, and sunlit coffee. The annual and interannual variability of soil moisture are highly intertwined for the period 1997--1999, during strong El Ni¿o and La Ni¿a events. Soil moisture exhibited greater negative anomalies during 1997--1998 El Ni¿o, being strongest during the two dry seasons that normally occur in central Colombia. Soil moisture deficits were more drastic at zones covered by sunlit coffee than at those covered by forest and shaded coffee. Soil moisture responds to wetter than normal precipitation conditions during La Ni¿a 1998--1999, reaching maximum levels throughout that period. The probability density function of soil moisture records is highly skewed and exhibits different kinds of multimodality depending upon land cover type. NDVI exhibits strong negative anomalies throughout the year during El Ni¿os, in particular during September--November (year 0) and June--August (year 0). The strong negative relation between NDVI and El Ni¿o has enormous implications for carbon, water, and energy budgets over the region, including the tropical Andes and Amazon River basin. ¿ 2001 American Geophysical Union