This study aims to:(1) Knowing model of outdoor learning subject specific pedagogy that is feasible to use (2) Knowing the effect of outdoor learning model on critical thinking ability of Students. This study used quasi-experimental. Subjects in this study were X MIA 4 and X MIA 5 Sleman 1 State Senior High School registered as students in the 2017/2018 school year. Sampling in this study used purposive sampling technique based on certain criteria. Class X MIA 5 was an experimental class using experiment-based outdoor learning models while class X MIA 4 was a control class taught using conventional models. Data collection techniques used questions related to critical thinking skills. The instrument used was test of critical thinking skill which 5 indicators and 8 sub indicator. Learning tools developed were lesson plans, student worksheet, and critical thinking assessment instruments. Before being applied, learning tools were validated by experts to measure their feasibility. Measurement of whether or not there is influence of the model application on critical thinking skills is used t-test. The results of this study (1) the quality of learning devices of outdoor learning model according to expert material assessment were very good categories,(2) outdoor learning models effectively applied to upgrade critical thinking ability.