The Season is when the new logger boys are introduced to Society. They dress up in their best rigging clothes and White Ox gloves and waltz around the shop in the wee hours of the morning....
Naw.
If you are unfortunate to have to log in the National Forest, there are many seasons. Spotted Owl shut down starts on March 1 and goes until July 1 unless there is a real nest in the area and then it goes till September.
Danger of killing Salmon begins anywhere from October and then ends when the rainy season is thought to stop--about June.
Marbled Murrelet season ties in with the owl and goes through September. However, you may operate if you wait an hour after sunrise to start and quit an hour before sunset starting in August.
Bald Eagle nesting is Jan 1 to ???June or July.
Winter Range shut down is November 1 to May 1? Elk Calving takes it into June.
That leaves July, August, and September as "the season" and there are usually shutdowns in August and September for fire danger. So that makes July "the season".
Of course, all these do not apply all over, and some waivers can be given, except the Spotted Owl restriction is pretty much sacred. The logger has to do or hire somebody to do surveys (go out and hoot for owls) for two years in a row before that can be waived.
So, if you want to stay in business, you need to log on state and private land. The haul roads are rocked, and if a yarder is used, fire danger, snow, landslides, market conditions and being sick of the downpour are about all that will shut it down. The conclusion? There is no "season".