The Central West Trillium Zone was started in 1983 as part of the Trillium Hunter Jumper Association. The zone originally offered 5 shows with only 4 divisions and today has grown to have over 22 divisions and one of the biggest memberships in the circuit.
The Trillium circuit was designed when trainers noticed the large divide between local schooling shows and the Ontario A circuit. Trillium allows riders the opportunity to compete at quality, rated shows without the time and financial commitment of the A circuit.
Today the THJA is host to 7 zones across the province and has given countless riders a place to grow as competitors.