Old thread: I know.
I'm in Northern MN: similar climate and have been consistently disappointed with the Brandywines: low production and what I get comes rather late when nights are getting cool.
In my opinion, flavor begins to really go south then.
Last year, I tried two varieties from trades that really amazed me. One was an insanely productive small determinate that probably doesn't interest you, but "Astrakhansie" probably fits the requirement, and was a bit earlier.
A quick Google search shows a few small seed houses selling it, but I'm not sure anyone in Canada has it.
Message me if you want to try and can't find seeds.
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a day without fresh homegrown tomatoes is like... ...sigh
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