Main Content The 4-H Youth Development Program is open to youth in kindergarten through one year out of high school (K–13). The 4-H year begins in September but new members can join at any time. So You Want to Join 4-H? Here’s How! Review our list of clubs.Call the county 4-H office at 856-216-7130, ext. 2 to confirm the club is taking new members and find out how to register online.Complete online member registration by following instructions provided on the New Jersey 4-H website.Attend your first club meeting!