The average arborist salary at U R I was $38,843 , which is 4 percent lower than the average salary for this job in Rhode Island, and 38 percent lower than the national average for this job . Arborist salaries at U R I typically range from $38,644 to $39,239 (25th to 75th percentile). The highest reported arborist salary was $39,239. There are 3 employees at U R I with the job title arborist.