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 21 divisions and one of the biggest memberships in the circuit. 

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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. 

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Today the THJA is host to 7 zones across the province and has given countless riders a place to grow as competitors.