RE: How often should a trap site be freshened up?
Lots of variables to deal with here: rain, snow, temperatures, targeted animal, etc.
I refreshed my dirtholes about every five days if the weather was cooperative (no rain or snow). I refreshed them after each good snow and rain event. If you are using dirtholes the rain may wash dirt into the hole and cover up and dilute the scent you are using. One trick I used was to scratch away the snow from a set as a visual attractor. The animals could see the fresh dirt on top of the snow really well!
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