Evaluating the archaeological potential of wooded areas is often difficult because many of the techniques archaeologists commonly use to locate and map archaeological sites elsewhere are less effective in the trees. Ground cover hinders the visual identification of surface artifacts during pedestrian survey, and the tree canopy impedes many of the techniques used to map areas of interest, such as optical theodolites and DGPS. Shovel test pitting, which disturbs the integrity of sites and provides limited contextual information, is the most common method used to evaluate woodlots today. In light of increasing interest from Indigenous peoples in limiting the impact of archaeological work on their cultural heritage, we are testing less invasive methods to locate and map archaeological sites within wooded areas. Here, we present the results of a magnetic susceptibility survey on a wooded precontact site in southern Quebec, where the technique rapidly determined site limits and pinpointed the location of several longhouses and other features. Where geological conditions are suitable, this method could considerably reduce the cost and impact of archaeological assessment and investigation of wooded sites by both cultural resource management (CRM) and academic archaeologists.