The objective of this paper was to investigate the relationship between the implementation of safety standards and guidelines for school grounds and student safety in public mixed boarding secondary schools in Nakuru County, Kenya. Invitational Theory and Systems Theory guided the study. The target population included 2130 Form 4 students, 16 principals, 18 deputy principals representing all 16 public mixed boarding secondary schools in Nakuru, Kenya. The study applied a descriptive survey design. A census approach was used. A stratified sampling technique was used in categorising the population into three strata; principals, deputy principals, and Form 4 students. Principals and deputy principals were selected using the purposive sampling technique, while the students were selected using a simple random sampling technique. Questionnaires, interview schedules and observation checklist was used in data collection. Data analysis was performed using tools in the SPSS version 22. The analysis involved computation of descriptive statistics: frequencies and percentages, and inferential statistics: Pearson Correlation. The data was later presented in tables and textually. The study found that implementation of Safety Standards and Guidelines for School Grounds have a statistically significant relationship with student safety in public mixed boarding secondary schools in Nakuru County, Kenya. The study recommended that school management should consider taking inspection and supervision of the school grounds seriously. There should be serious compliance with the Safety Standards and Guidelines for School Grounds. The schools should follow the schools' guidelines on labelling trees showing those that may be poisonous as this had not been done.