When should a senior college student begin to search/apply to jobs?

Go to ur college career placement office (could have a dif name) if u don't know where this is, its usually in or around the student services office, they might have a website specifically for students at ur school where employers post available jobs from all around the country I would give a link to the one my school offers but u need a login id/ password, your school would also be able to help/ aid you in deciding when to start ur application process, but definitely look to see if your school offers the online job search b/c this gives lots of job listings that are not offered to just anybody.