Deborah: If you are using the tractor supply brand premium flake it is kiln dried.
The place I usually get my pine from was out and I had to use the tractor supply brand.
I was concerned because the bag did not state if it was kiln dried so I asked the store manager. He stated it was.
Really did not like the brand however it did the job. I was glad to get back to the Guardian flake I have always used.