Scouting for covers

[ASB]

A question for you all with more years of age and experience, as well as a longer list of favorite grouse covers than myself:

In the process of scouting potential new covers for birds before an upcoming season, how soon is too soon to determine whether or not said spot will be holding birds come opening?

During turkey scouting in the spring, I was fortunate enough to overhear some grouse drumming along in the morning sun and even flushed a couple along the way. That being said, it’s impossible to be everywhere throughout the spring, and since that time of year has passed, I’m curious to hear some thoughts on this.

Thanks!