Falcon nesting closures are usually in effect from March 15 to July 31. See the BC parks website for more details:
http://www.env.gov.bc.ca/bcparks/explore/parkpgs/stawamus/From the BC Parks site:
Closed Climbs: Millennium Falcon, Sports Illustrated, Cloud Burst, Sea of Tranquility, Getting Down on the Brown, Supernaut, Clean Corner, Negro Lesbian, Crap Crags, Slow Dyke, Illusion, Planet Caravan, Warriors Wasteland, Freeway (above 5th pitch), The Big Slick, Brothers in Arms, Western Dihedral (4th pitch and above).
Open Climbs: Arrow Root, Cleaning the Brain, Deadend Dihedral, Rutabaga, Sticky Fingers, Slow Duck, Time Passages, Freeway (to the top of 5th pitch) and Western Dihedral (to the top of the 3rd pitch).