ah lame, found my answer
http://www.amlegal.com/sanjose_ca/lpext.dll?f=templates&fn=main-j.htm
10.32.140 Projectile weapons prohibited.
A. No person shall, within the limits of the city of San José, make use of any slingshot, crossbow or similar device, or discharge or propel any dart, pellet, BB, rock, bolt, arrow or any other projectile from any air rifle, air pistol, BB gun, pellet gun, slingshot, rubber sling, crossbow or other instrument or device by means of which missiles of any kind or description are hurled, shot or projected.
B. The prohibition in subsection A. shall not apply to the use of bows and crossbows at archery and crossbow ranges within the city. Bows and crossbows shall be used at ranges in a manner that will not endanger the public health, safety and general welfare.
(Ords. 19800, 24227.)
Great, cant even play poor man's shooting gallery in my backyard. Heck, if you wanna be a dick about it, you cant even fire a nerf bow and arrow. As its a projectile weapon shooting a dart. At least i still got rubber bands!