In Queensland State Schools, the normal Term and Holiday Dates are set by the Department of Education and Training, and the 2012 dates are:
Term One:
Begins: Monday 23 January 2012
Ends: Friday 30 March 2012
Holiday: 31st March 2012 to 9th April 2012
Term Two:
Begins: Tuesday 10 April 2012
Ends: Friday 22 June 2012
Holiday: 23rd June 2012 to 8th July 2012
Term Three:
Begins: Monday 9 July 2012
Ends: Friday 21 September 2012
Holiday: 22nd September 2012 to 7th October 2012
Term Four:
Begins: Monday 8 October 2012
Ends: Friday 14 December 2012
Holiday: 15th December 2012 to 28th January 2013
Independent and Catholic schools may vary these dates, sometimes by a week or so, and are all changeable on an individual school basis.
The official website to check the State School dates is: http://education.qld.gov.au
For all Independent and Catholic schools you need to check with the individual school.