I have my containers outside also and the one still has quite a few leaves still on it. We are in the 50's this weekend.
Stacy

I'm bringing mine in tomorrow. Next week looks very cold, at least for parts of Wisconsin.

I live in Southeastern Washington and have left my blues out for the last three years running. Granted this isn't Wisconsin but we did hit zero last year several times and we had a couple two week periods where the days didn't get above 15 degrees. My plants were in 18" or so pots, the soil felt hard as a rock, frozen solid and they came through just fine, not a bit of damage. I think blues are tough! This winter I moved everything to the ground because I think they will do a bit better but if I had them in pots I wouldn't worry a bit about leaving them out.

RM

Maybe I baby my Blues too much, I've had them in the garage since before thanksgiving. Our coldest night so far was 26F. I expect them to get their deg. days in the garage.
Dan

I'm in z6 NY and I've had plants in containers survive winter here where it went well below 0. If I threw some mulch around the pots I doubt any other protection would be necessary even in test winters.

Mine are still outside also......and doing fine:)

Hmmmmmmmmm.......Maybe I'll leave them out (for a while anyway.) We get below zero every year and sometimes for a week at a time. The good news is that we're also in the snow belt, and have quite a snowpack also. Not sure if that would offset the cold though. Anyway, I'm happy that alot of people have theirs outside also, and I don't have to worry "yet." Thanks for the feedback.

Highs are supposed to be in the 20's here next weekend. Might be moving day.