Experimental High Energy Physics Summer School for High Schools, (Liseler I. cin Deneysel Yuksek Enerji Fizigi Yaz Okulu - lidyef2018) was held 9-16 September 2018 at Bogazici University, Turkey, with financial support from TUBITAK under the 4004 grant No. 118B491. Out of nearly 700 (11th and 12th grade) applicants, 30 were selected from all around Turkey. Students were introduced to the fundamentals of high-energy physics and performed experiments that demonstrated the techniques of this field, such as a salad-bowl electrostatic accelerator and a cloud chamber. Here we report on the planning, implementation, and the outcomes of lidyef2018, which can serve as a template for similar activities in the future.