During the summers of 2004–2006, harmful outbreaks of Leptoconops noei Clastrier and Coluzzi (Diptera: Ceratopogonidae) occurred in a small region in the southern part of Alava (Basque Country, Spain). Two types of traps were placed for monitoring L. noei: CDC traps baited with dry ice in eight different locations and sticky traps at three different heights (two, four, and six meters). A total of 1,823 adults were captured with dry ice traps and 163 specimens with sticky papers. Dry-baited collections occurred between June and August in two of the eight samplings places. Significant differences were observed concerning the vertical distribution of L. noei. The most specimens were captured at a height of two meters. A specific area near the riverside composed of sandy matter was described as the main developmental site for L. noei. This is the first record of L. noei in Spain.