Hair maintenance

The Goldendoodle is considered to be a non- to light shedder, but he requires regular grooming and clipping. If the coat is kept short, it should be clipped every six to eight weeks and brushed every few weeks. If the coat is kept in its natural state, it should be brushed once every week or two.


http://dogtime.com/dog-breeds/goldendoodle

In our experience it depends on how you like the coat. We like it a little longer.  We cut it every 12 weeks roughly.  You can do it yourself or Petgroomers will charge you between 70 and 90 dollars to do it.
They'll usually clean out their ears, trim their nails and bath them at the same time.