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I've had this spruce for a few months and it's stayed in the same windowsill to receive light from morning to night. It started turning colors a few weeks ago but a section of it remains green. Is this a sign of over watering or under watering? Would it do better outside of the window on the porch with the morning weather being below freezing?

Hello and welcome.
First of all, this is a juniper, not a spruce.
Second: there is no such thing as an indoor tree. Your juniper needs to be outside asap. Problem with conifers is that they show signs of problems only long after they become sick or have already died. So, outside with it, in direct sun and hope.

Thanks for the clarification. Will the roots be ok with the morning temperature being below freezing?

Of course it will. It is a hardy species.

......unless you get temperatures below -20 for prolonged times.

Oh no. I woke up today to 28F.

Cavemankann wrote:

Oh no. I woke up today to 28F.

….. and all trees in the forest migrated inside?
Stop anthropomorphising.

It's not anthropomorphising when the roots are above ground in a pot and can freeze.

Yes, there are a risk with frozen roots. Because frozen roots cannot take water. But the tree dont need much water in winter. If you experience very low temperature for long time and no snow in spring when sun starts to get stronger, it makes sence to protect the tree. Eigther by shading it or get the temperature up above freezing.

If you have snow the best is to make sure the tree is covered in snow at all times.

A few degrees below freezing in the night is never any problems.

I live in Sweden and sometimes we get really cold winter. I keep most of my trees in an unheated greenhouse during that period. Last winter we had constant below -10 for six weeks in a row. All the soil on all hardy trees was solid frozen during that period. I put a tarp in the roof to shade them a little. All of them survived and spring growth was amazing.