I am going the second weekend in October, 6th-10th. I will be truck camping and hunting Thursday through Saturday, then spending Sat. Night in a comfy cottage in the Greenville area and driving home Sunday.
Be prepared for cold weather. The first night I camped last year it was 17 degrees and howling wind, most of the next morning was cold and windy. the next two days were considerably warmer.
The first week of Moose season in much of Maine starts 9/27, and the second week starts 10/11. There will be lots of guys driving the roads looking for moose and shooting grouse along the way. I was surprised last year how many guys I saw in areas I thought I'd see no one. The later you go, the less road birds you'll see. While I don't like the idea of shooting birds on the road, finding birds on the road is a good way to identify areas to get out and work with the dog. I hunted in Unit 4 last year and will head to the same area to start this time.
Moose hunters were a great help, I told them where I saw fresh moose sign and they gave me tips on where to find birds.
The Northwest corner of Maine is owned by timber companies who allow access, Google the "North Maine Woods", there are maps, primitive campsites, and lodges listed on the website.
I ran out of cell service not far north of Greenville last year, I downloaded overlapping maps through the OnX app and it worked perfectly.
As has been said before check the birds crops, you never know what they might be feeding on.
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Have fun, it s beautiful country and well worth the time and effort to explore!
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