Raccoons are very strong, very smart and very persistent.
Chicken wire is to keep chickens in ONLY. It's easy for a raccoon (and other predators) to rip through which is why it is highly suggested to use hardware cloth everywhere you can afford it. The second best choice is 2x4 welded/woven wire with hardware cloth or 1" chicken wire wrapped around the bottom 2 feet and buried into the ground at least 15 inches. (Deeper is better to stop diggers.)
Many people also cover their runs with wire to keep predators from going through the top but you have to make sure that any place the wire comes together is securely 'tied' together in some fashion as your run is only as safe as it's weakest link/point. (I have a friend who couldn't figure out why the wire on the top of her run was starting to sag. Then she looked out her window and saw a coyote literally on top of the run, jumping up and down until it forced a gap between the side wire and top wire. Before she could get out there it had jumped into the run and killed her chickens.)
The gaps around the entrance gate (on the sides and under the frame) are always a potential predator entrance spot - especially if using chain link.
The biggest threat to our chickens safety is almost always nighttime. That's why most people lock up their chickens in a coop at night. Use hardware cloth over all windows, vents or other openings and make sure you have a secure lock of some sort on the door/pop hole. Raccoons can use their fingers a lot like ours and can open many types of closures.
It's great that you are being proactive ... you've got lucky chickens!
Chicken wire is to keep chickens in ONLY. It's easy for a raccoon (and other predators) to rip through which is why it is highly suggested to use hardware cloth everywhere you can afford it. The second best choice is 2x4 welded/woven wire with hardware cloth or 1" chicken wire wrapped around the bottom 2 feet and buried into the ground at least 15 inches. (Deeper is better to stop diggers.)
Many people also cover their runs with wire to keep predators from going through the top but you have to make sure that any place the wire comes together is securely 'tied' together in some fashion as your run is only as safe as it's weakest link/point. (I have a friend who couldn't figure out why the wire on the top of her run was starting to sag. Then she looked out her window and saw a coyote literally on top of the run, jumping up and down until it forced a gap between the side wire and top wire. Before she could get out there it had jumped into the run and killed her chickens.)
The gaps around the entrance gate (on the sides and under the frame) are always a potential predator entrance spot - especially if using chain link.
The biggest threat to our chickens safety is almost always nighttime. That's why most people lock up their chickens in a coop at night. Use hardware cloth over all windows, vents or other openings and make sure you have a secure lock of some sort on the door/pop hole. Raccoons can use their fingers a lot like ours and can open many types of closures.
It's great that you are being proactive ... you've got lucky chickens!