Boise area browned evergreens

Why are my evergreens brown and are they dead?

You may have evergreen trees that look like a blow torch was waved over them. This is from the sudden deep freeze we had around Thanksgiving last year. Normally these trees would be very cold hardy but they need a slower cold process to harden off for winter and last fall they did not get that.
Here is an article from the Extension office in Utah about the situation.

So are they dead and should you replace them?
Trees never do anything fast, so we should never had a fast reaction. Give them time and see if they recover. I am doing deep root feedings (Normally done in the fall) on these damaged trees. An interesting observation is that the trees I have been deep root feeding for two or more years did not show any damage. Healthy trees have a better ability to withstand strange weather changes and environments.

Cost to do a deep root is around $8 a tree with a $44 minimum.