For Spring 2020, the provost recently announced that CU Boulder will lift restrictions on pass/fail credits for all majors and degrees (other than law) and allow those students to declare a pass/fail option for most classes.
For details, read the full announcement and see the pass/fail sections in both the student class FAQs and the instructor class FAQs.
Please continue to check the CU Boulder coronavirus updates and resources page for the most current information.