While I'm lucky to have inherited a number of frost-proof hydrants to run water from around the farm, the closest one is still about 400' from the main garden.
The simplest solution? 400' of large diameter garden hose.
This year I mowed a strip before I rolled it out so the hose is easier to find and I'm not always worried about running over it with a tractor or other equipment. I'm sure I'll have to do it again in a few weeks.
The biggest downside of using a small hose for a long run like this is loss of pressure. Fortunately I'm not using high pressure sprinklers which waste water and can create disease by wetting the foliage, so the simplest solution works out in the end.