Mango Tree here in New Zealand

If I grow the Mango Tree in my sun room to a reasonable size ( 4-5 years ) can I then place it outdoors to face the Winter ?
 
People grow lots and lots of mango in zone 10B. Some of my friends in Miami have huge mango trees. They are in zone 10B like you.
 
If I grow the Mango Tree in my sun room to a reasonable size ( 4-5 years ) can I then place it outdoors to face the Winter ?
If I live in zone 10B, I grow my mango outside from seedlings. There is no need to keep them indoor at all. I am in 9A and I grow mango trees. I only take them inside a couple weeks a year when it gets below freezing. As soon as I see +2 C I take them outside.
 
How does the USDA zoning work , I would like to understand how they compare New Zealand to USA ?
 
The only thing that matters when determining the USDA growing zone of a region is its extreme temperature lows. A location's USDA Growing Zones is based on 30 year average extreme minimum temperature.

Your area is 10b. Your 30 year average lowest temperature is 2 degree C. Mango will survive that so you can keep your mango outside.
 
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Excellent thanks for the explanation and understood . Mango trees seem to struggle here in the winter - so I guess the temperature is going lower and yet we have climate change ?
 
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