How cold hardy is Johnson Keeper Apple?

How cold hardy is the Johnson Keeper apple tree?
How far north will it survive and thrive?
What is the furthest north it can ripen fruit?
It Johnson Keeper a disease resistant tree?
Scab resistant?
Mildew resistant?
Fireblight resistant?

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I suspect it’s cold hardy enough in zone 5.
A bigger question is if it’d ripen before cold temperatures in fall.
I am not sure…mine has not fruited yet.

Thanks. Please let me know whenever you find out.

I’ll probably plant one in zone 5 as an experiment.