Trials events allow riders from 6years and up. However, not all trial events organise a kids class, so it is best to check with the organising club to ask what classes they are running.
Trial events cater a range of abilities, often setting up courses with different routes or ratings, i.e. a ‘white’ route will be for novices for example. It is advisable to speak to each club prior to entering to ensure they are setting out a route based on your ability.