Each agency has different requirements as far as education and other training needed for employment. It is best to check directly with the agency involved. Sometimes this is as simple as visiting a local park and asking questions. It may also involve checking with the personnel department of the agency. One of the best ways to get employment in the field is to start as a seasonal employee or volunteer .
Seasonal jobs are much easier to come by than full-time or permanent positions.
It is surprising how many doors seasonal work can open. Even if there are no positions available at the agency you work for as a seasonal, many times your supervisor will become a mentor and recommend you for openings with other agencies. Often when full-time positions are advertised there will be hundreds of applicants that meet the minimum requirements. Don't overlook volunteering as a foot in the door either. Check out the Meet the Rangers page.