The club trial season usually begins in February each year and ends in May.  Entry is open to all competitors and their dogs.  There are usually 4 events at each trial:  the Long Head, the Short Head and Yard, the Zig-Zag Huntaway and the Straight Huntaway events.  Heading dogs (silent working dogs, evolved in NZ from border collies) compete in the heading events; and huntaways (evolved in NZ from border collies and various barking sheep dog breeds) compete in the huntaway events.