Two reliable and valid instruments to assess first- and second-grade children's ( N = 100, M = 6.8 years) environmental attitudes and behaviors are presented. A series of games derived primarily from dimensions of the new ecological paradigm theory of environmental attitudes are described for the assessment of environmental attitudes. The games include felt board construction, a board game, and an adjustable worry thermometer. Environmental behaviors are assessed in the same sample using magnitude estimation (jumping different distances to indicate frequency of engagement in behavior) based on an adoption of Kaiser's General Environmental Behavior Scale for adults. The behavior scale employs a Rasch measurement model because environmental behaviors are viewed as a consequence of attitudes in concert with difficulties to implement actions.