Also, how long should I keep the trees in the pollinator bags for? They seem to be progressing. When I get the chace to take them out if I get the chance, do I still keep them in the shade or partial shade.

I usually keep them in the bag for around a month. I begin to get them acclimated to being outside the bag by cutting slits in the bag for a few days before I take the entire bag off. I've had problems with mites and other bugs killing newly grafted mangos for some reason but i've found out that spraying with sevin takes care of it all. I tried all the all natural stuff with no luck so I had to use the chemicals. The only time I have ever had to use chemicals is on the newly grafted stuff.

Keep them in partial shade when you now take them out of the bags then get them used to full sun. If you go straight from shade in the bags to no bags with full sun theyll probably burn up and die.

I am not sure if the cold will be a problem but to be on the safe side you can bring them in over night.