Haven't done it yet....
Oh boy....looks like you will be doing it soon. I am not looking forward to snow!
I got a few dug yesterday. It's been a really strange fall. We had frosts a few weeks back, but it didn't kill all the dahlias. I've been waiting for a more killing frost...that occurred last night. We've had so much rain that it makes digging the ones that had died very difficult...the soil is just too heavy, so no matter how I dig them, they're easily broken.
We are a little behind you, but they are predicting a drop to 25 by the end of the week. That should be the end of the season for us. I am not looking forward to all of the digging and sorting for storage, but weirdly enough your picture is making me look forward to winter.