What is the most common outdoor nest site for carpenter ants?

The most common outdoor nest site for carpenter ants is found in hollow trees. Carpenter ants prefer locations that provide protection and moisture, and hollow trees offer an ideal environment for them to establish their colonies. The decay within the tree creates cavities, making it easier for the ants to create their nests. Additionally, hollow trees often provide them access to food sources because they are typically surrounded by a variety of flora and fauna.

While buried wood, stacked firewood, and stumps can also be potential nesting sites for carpenter ants, they are not as commonly utilized as hollow trees. Buried wood may not provide the same level of access or protection as the above-ground nesting options, while stacked firewood can be disturbed frequently, making it less suitable. Stumps may offer some benefits, but hollow trees are generally preferred due to their size and structural characteristics that align well with the carpenter ant's nesting behavior.