The park is home to more than 100 sandstone arches . In 2009 , the supervisor invited her to become a seasonal ranger . Iron oxide creates the chemical reaction that turns the sandstone green . Utah 's high desert has scalding summer and freezing winter temperatures . The best time to view wildlife in the park is October through December .
The park is home to more than 100 sandstone arches . Iron oxide creates the chemical reaction that turns the sandstone green . Utah 's high desert has scalding summer and freezing winter temperatures . The best time to view wildlife in the park is October through December .