The Tropical Fruit Forum

Tropicaltoba, the answer is "as far North as you want! In your greenhouse..."

Seriously, though, the NRCS Plant database map shows the native range well up into Ontario.

https://www.wildedible.com/pawpaws#range

Maybe you could  get them well established in your greenhouse then transplant them to a sheltered location. I started mine that way and they are doing well now in the yard. I am in zone 6.

Good luck!

Carolyn

That map only shows that they're native to Ontario, not to how far in Ontario they grow naturally.

I know of four wild groves here in Ontario. I've only seen fruit on two of those (one is too young/new, the other probably doesn't get enough sun). I think the main limitation here is not the winters but the length of the growing season - most of the wild pawpaws ripen right around the first frost, and those are groves located in the southernmost parts of Ontario along Lake Erie (USDA Hardiness Zone 6).

There's a farm in Niagara Region that grows them commercially, and apparently (haven't been though), one around Borden, ON.

There's a guy I follow on Youtube from Magnitowoc, WI, he's been able to grow some up there.
https://www.youtube.com/watch?v=mWXAifWB8js&ab_channel=RickLarson

Rad vid, thx for posting.

I don't have irrigation on my trees out back so I've been relying on the rain and mulch/ground cover to keep things moist for me.  All has been good without hand watering at all so far, but I did give it some h2o yesterday since it has been mega hot with no rain in sight. 

I'm seeing a lot of late varieties on the resistant list. I wonder if there is a link there.

And here’s what the inside looks like when you crack one in half