Very dependent on region/state on the college level.
If you reed most state requirements they might ask for a Bachlors or Masters but also offer a thing called "equivilancy," this is a recognition of work experience equal to a college degree. This route often takes extensive doccumentation of experience and professional training in your career.
Teaching at the high school level is actually far more regimented with No Child Left Behind criteria demanding a degree even for the trades for new teachers.
My friend got hired to teach welding at the local city high school (Oak Ridge Tn).He is a CWI,and a Navy X-ray pipewelder,but has no college.When He got hired,they listed his experience as bachelor degree plus 6,meaning 6 years of experience,although he did have to get his teaching certificate,he still has no college.The long and short of it is, they considered him qualified because of his life experience.and he has been there 10 years.