What Duolingo score do you need for Radford University?

International freshman, transfer and graduate students must submit proof of English proficiency. Radford reserves the right to request additional documentation or conduct interviews before making a decision.

The page gives no Duolingo subscore rule.

For comparison, the same requirements page sets IELTS at 6.0 for undergraduates (minimum 5.5 in Reading) and 6.5 for graduates.

The page lists two other ways to meet the requirement: transferring from a US institution, or prior attendance at an institution in one of its waiver countries. It does not describe conditional admission.

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