Trail Worker applicants have rated the interview process at National Park Service with 1 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 77.7% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -
Application on USAJobs followed by a single phone interview for a WG-3 position. Short and brief phone call detailing experience in the backcountry and with hand tools, since I had no trail work specific experience.