At what point is it safe to allow chickens to range in an area that has been sprayed with Round-up? We had some bamboo and other invasive plants dug out of our yard. The landscaping company is coming around every few weeks to spray the area with Round-up to get rid of anything they missed with manual digging. My chickens usually range in my backyard most of the day. At what point is it safe to let them out again? The Round-up people say one hour, but that is probably more for cats and dogs, not pets who actually eat the greenery that has been sprayed.