Dahlias - when do you stop Dormancy? Zones 5-7

[canadian-gardening]

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Last year I think I woke-up my Dahlias a little too early - because they got too happy and leggy.

This year I know they are sprouting in the bucket, but I]m pretending I didn't see it.

When do you start your Dahlias in Zones 5-7?

https://canadian-gardening.ca/flowers/h ... zone6.html - how to grow dahlias
https://canadian-gardening.ca/climate-g ... anada.html - hardiness planting zones in Canada

https://canadian-gardening.ca/climate-g ... anada.html - Frost dates in Canada by Province and Cities

I also left my dahlias in the ground all winter and they rotted in zones 5 and 6A.

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[canadian-gardening]

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I did a google search and it says:
6-8 weeks before last frost date.
For me it's about the end of May so I'll start mine around the end of March.
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