From their website <http://www.butchartgardens.com/admission/hours.php>
01/05/04 - 31/05/04* 9:00am - 6:00pm*
01/06/04 - 14/06/04* 9:00am - 7:00pm*
15/06/04 - 05/09/04 9:00am - 10:30pm
06/09/04 - 15/09/04 9:00am - 9:00pm
16/09/04 - 30/09/04 9:00am - 5:00pm
01/10/04 - 14/10/04 9:00am - 4:30pm
15/10/04 - 31/10/04 9:00am - 4:00pm
01/11/04 - 30/11/04 9:00am - 3:30pm
01/12/04 - 09/12/04 9:00am - 9:00pm
10/12/04 - 06/01/05* 9:00am - 10:00pm*
06/01/05 - 28/02/05 9:00am - 3:30pm
*The Gardens will remain open on the evenings of May 21, 28, 29, June 4, 5, 11,& 12 with gates closing at 8pm, grounds closing at 10pm.
*Please note on 25/12/04 gates open at 1p.m.