Accessibility is an important property of geoheritage sites (geosites), which is commonly considered in their assessment. A new method, which refers partly to previous developments, is proposed to assess this property semiquantitatively. Inner (on-site) and outer accessibility are distinguished, and each is measured depending on the opportunities to reach unique geological features. Distant visibility and entrance fees/required permissions are also taken into account. On the basis of the scores, three grades of geosite accessibility (excellent, moderate, and low) are delineated. The proposed method is applied to 15 geosites of Mountainous Adygeya (southwestern Russia), and the outcomes prove its efficacy. This application also helps to establish within-site and territorial spatial heterogeneity of geosite accessibility and to propose some managerial implications.