What is the average lifespan of a roof rat?

The average lifespan of a roof rat typically ranges from 12 to 24 months. This estimate reflects how these rodents tend to face various threats in their environment, including predators, disease, and human intervention, which can all impact their longevity.

Given this lifespan range, choosing 12-24 months encompasses a realistic view of their life expectancy under natural and urban conditions. While some individual roof rats may live longer, particularly when conditions are favorable and they are not exposed to significant dangers, the majority do not exceed this period significantly.

This average is supported by studies and observations of roof rat populations, which often show that most do not survive beyond two years in the wild, thereby lending credence to the accuracy of the selected lifespan range.