I use dirt holes with a big pine for backing (a bank or log would work too but the pine helps keep the snow off).
Put a cotton ball with lure on it in the hole (I like Hawbackers) and spray Cat or Fox pee on the backing.
Set the trap about 8" from the hole and use guide stix......don't be stingy with em...really choke em down.

I've had a fair bit of success with this method.

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Don't be surprised if you catch other critters too.

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