This study examines the relationship between the physical activity levels and motor abilities of children in forest kindergarten. In Study 1, we measured the number of steps which the children took while walking in forest kindergarten. It was found that these children took more steps than those who were in other kindergartens. In Study 2, we examined the correlation between the physical activity levels and motor abilities. It was shown that the more steps a child took the higher level she/he achieved in tests for running and jumping ability. In Study 3, we examined the motor abilities of students who had graduated from forest kindergarten. The results indicated that first year students had ordinary levels of motor ability, while second to fourth year students had higher levels of ability. These studies suggest that forest kindergarten allows children to participate in higher levels of physical activity, which has an indirect positive effect on their motor abilities as they grow.