The Forest School movement, an important part of education in Scandinavia, has gained momentum in the UK in recent years. Within the context of declining access to, and engagement with, the natural environment Forest Schools can provide invaluable life experiences for our children. In 2012 the University of Northampton investigated opportunities to develop part of its campus as a forest site for use by schools and to enhance its students' learning. A researcher from the university evaluated the impact of visits made by children from the pilot primary school through a series of pupil, staff and parent interviews. Analysis of the interview data showed that evidence of impact was anecdotal and it was clear that a systematic approach was needed. The university and school have collaborated in developing a toolkit for evaluating this impact, which will act as a starting point to support other schools visiting the site. (Contains 1 figure.)