From US News and World Report (C&P)

“California Polytechnic State University -- Humboldt has an acceptance rate of 90%. Half the applicants admitted to California Polytechnic State University -- Humboldt who submitted test scores have an SAT score between 1040 and 1273 or an ACT score of 21 and 24. However, one quarter of admitted applicants achieved scores above these ranges and one quarter scored below these ranges. The application deadline at California Polytechnic State University -- Humboldt is April 30.
Admissions officials at California Polytechnic State University -- Humboldt consider a student's GPA a very important academic factor. An applicant's high school class rank and letters of recommendation are not considered by admissions officials at California Polytechnic State University -- Humboldt. To see additional academic factors along with other school data, learn more about College Compass.”

“Clemson University has an acceptance rate of 43%. Half the applicants admitted to Clemson University who submitted test scores have an SAT score between 1220 and 1410 or an ACT score of 28 and 32. However, one quarter of admitted applicants achieved scores above these ranges and one quarter scored below these ranges. The application deadline at Clemson University is May 1.
Admissions officials at Clemson University consider a student's GPA a very important academic factor. An applicant's high school class rank, when available, is considered very important and letters of recommendation are considered by admissions officials at Clemson University. To see additional academic factors along with other school data, learn more about College Compass.”

So it looks like lil’ ole’ Clemson is a tougher gig than Cal Poly - Humboldt.