What Duolingo score do you need for Salem State University?

Sub-scores for the sections of the exam are considered in judging whether a student's English is strong enough, and the admissions office can request additional proof of proficiency even from applicants who meet the listed minimums.

The page gives no Duolingo validity period.

For comparison, the same page sets IELTS at 6.0.

Students can instead complete core level 5 or higher of the American Language and Culture Institute's intensive English programme at Salem State, with a Pearson Progress Test score of at least 49 and a letter from the programme director. An SAT reading and writing score of 470, a B in an equivalent of ENL 110 at a US college, or an IB diploma also exempt you.

Requirements vary by programme and change between admissions cycles. The score that binds you is the one on your Salem State programme page and in your offer letter, so check it there before you book a test.