tree to grow after a wild fire. Elmo montana

There was s fast moving wild fire that moved thru my property that killed most of my trees.  Looking to grow something fast that will provide shade and restore privacy ASAP.

I had the same at my 20 acres years ago in Australia.
I pumped water from my dam as far around the area that I could reach for a few days.
Then did nothing.
Within days small shorts appeared on the trees and the ground.
12 months later it was vibrant and 5 years later heavily vegetated.
The areas I could not get water on are still damaged and almost sterile.
Here our native bush does respond to fite, but in your area it may not.

Check if you have a local agriculture extension or conservation office. They will have trees for sale amd reccomendations for types to grow.

(Although I must say they aren't always the best--at least my local office has college educated workers but they are real dummies when it comes to actually knowing about the trees)
(Maybe I'm cynical because they told me they have thrown extra trees in the dumpster after the season ends)

Anyways....it really depends your land and if you have water available or not.

Might be best to dig some swales and berms first, then plant. Otherwise you end up throwing money away because they die without water. Reccomendations are about 1 quart to 1 gallon per week for the first couple years of life, depending on size. Easy jn theory, hard to do.