Notes From the Field: Bag Leaves at Curbside 12-9-2017 Leaf season is here! The only leaves on the street should be in bags! From Oct 1 – Dec 31, you may put up to 5 bags of leaves (only leaves) out with your green cart for weekly service. Please keep leaves out of the street to prevent storm drains from clogging! Learn more about leaf collection in Stockton. Read more Notes From the Field.