School climate measures are important tools that assist educators in evaluating the "norms, values, and expectations that support people feeling socially, emotionally and physically safe" (National School Climate Council, 2007, p. 4). Positive school climate is associated with academic performance indicators such as grade point average, achievement-related markers such as school satisfaction and identification, and student mental health and psychosocial outcomes. In Mongolia, no school climate measures have been developed or translated and evaluated for use in Mongolian schools. We adapted and validated of the What's Happening in This School (WHITS), a self-report measure for secondary schools, for use in Mongolia. After conducting a thorough literature review, we selected, translated and administered the WHITS to 1,471 students in grades 8-12 at seven schools in three of the largest cities in Mongolia. Exploratory and confirmatory factor analyses confirmed a six-factor structure that includes 36 of the original 48 items. The adapted measure, WHITS-Mongolia, is reliable and valid for use in Mongolian secondary schools. This study underscores the importance of evaluating the utility and validity of specific measures within a country.