These overwintered outside this past winter. Normal years saw blooms in late August.

Jay -

They are beautiful. I have heard of others having dahlias come back up that were not lifted last winter.

Looks like they had a head start because they did come back from being left outside. Mine are not tall enough to flower yet.

Pretty..That first one "Glows" I missed a couple last year and they came back also.

These are for all purposes in the wild (human element involved) at a altitude of 6500 feet. They over winter in the fields at 10 Celsius with two feet of snow on top of them. Hope it helps.
Regards.

KAMasud, are you sure it was 10 C ? You wouldn't have any snow for very long at that temp. It's equal to 50 F.
-10 C or 10 F would allow for the snow. Good snow cover allows many plants to be wintered over in ground that wouldn't otherwise live through the winter. I live in zone 5b yet have plants rated for zone 6 & 7 survive because in a typical winter ( this last certainly wasn't) we get as much as 5 - 6 feet of snow with outside temps of -20 C

Fall Dahlias

Sorry, minus 10 c. Sorry for that.
Yes, i have noticed that. Snowing or snow, temperatures are more peaceful. Blanket effect. Dahlias love the cold period or they become weak and leggy.
Regards,
Masud.