Many folks say to let the dahlia get hit with the first frost in the autumn, and then bring it in when the leaves are turning black. The idea behind that is to force the good of the plant into the tuber.

Others say, get them out just before frost.

Your call. If it is a light frost, I prefer the former. If it is a really heavy frost, I hope that the soil protects the tubers. As I say, your call.

Keep it in the sun. They love that. I also prefer to plant them directly into the ground, with a stake behind it for support.

Enjoy !