Every area differs with some typically going earlier then others. I’ve got areas I’ll hunt in early April and others I will focus on later in the roar, only way to learn that is hunt the areas a lot and learn over a few years where the stags hold and when they typically roar.
In saying that it can still be hit and miss. Some years they just seem to stay quiet while others they go to town. I will generally try to find stag sign and then wait them out camping nearby so I’m on the spot when they start roaring.
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