The study reported here investigated the impacts of participation in 4-H on young people's interest and participation in science. Survey data were collected from relatively large and ethnically diverse samples of elementary and high school-aged students in California. Results indicated that although elementary-grade 4-H members are not more interested in science than other youth, by high school, participation in 4-H is associated with a greater number of science classes and higher-level science coursework. These results suggest that the 4-H program may have the ability to influence science interest and participation in the long term among its members.