This study aims to provide a comprehensive comparison of ice adhesion testing approaches by conducting various ice adhesion tests on identical test surfaces. A total of 15 test facilities participated in the round-robin study, and the results of 13 partners are summarized. The test series included different ice types (impact and static) and harmonized test parameters to minimize deviations between setups. The findings are presented and discussed, highlighting the importance of standardized test methods and the need for further research to improve the understanding of test results and support the standardization process for ice adhesion strength measurements. The study covers direct mechanical tests, centrifuge tests, and Mode I tests, with results grouped by test types and ice types. The results show significant variations in ice adhesion strengths, emphasizing the need for standardized test conditions and the use of robust and long-term stable surfaces. The study also discusses the impact of test parameters such as icing time, ice geometry, and test duration on ice adhesion strength, suggesting that further systematic studies are required to identify the most decisive test parameters.This study aims to provide a comprehensive comparison of ice adhesion testing approaches by conducting various ice adhesion tests on identical test surfaces. A total of 15 test facilities participated in the round-robin study, and the results of 13 partners are summarized. The test series included different ice types (impact and static) and harmonized test parameters to minimize deviations between setups. The findings are presented and discussed, highlighting the importance of standardized test methods and the need for further research to improve the understanding of test results and support the standardization process for ice adhesion strength measurements. The study covers direct mechanical tests, centrifuge tests, and Mode I tests, with results grouped by test types and ice types. The results show significant variations in ice adhesion strengths, emphasizing the need for standardized test conditions and the use of robust and long-term stable surfaces. The study also discusses the impact of test parameters such as icing time, ice geometry, and test duration on ice adhesion strength, suggesting that further systematic studies are required to identify the most decisive test parameters.