Garden design
Garden zones 2

There are other things to consider with Garden Zones than just distance.  Here are some things to think about.

recreational uses
A food garden is not a purely functional one.  It has to look pleasing to the eye and have areas where you can relax, children can play and guests can be entertained.  Recreational areas and activities should be included in any zone planning.

visual zones
Zones should not be seen purely in terms of distance.  Being able to see your vegetable patch from the back door or kitchen window will make it seem much closer and easier to access then if it is out of view behind a shed.  Even though the actual distance might be the same.

integrating activities that are done in the garden
When planning your zones consider the different activities that you might be able to do at the same time.  For instance placing the clothesline next to the vegetable patch so when you hang out the washing you can also pick the vegetables for the day's meals at the same time, instead of having to make separate trips.

flexibility in zones
What you plant or build in each zone should not be seen as exclusive to that zone.  Many things will cross over into other zones.  For example fruit and nut trees should be planted wherever there is space, not just in the main orchard at the back of the garden.  You also may already have some fruit trees planted by people who lived in the house before you which could be a good starting point to plant your orchard.

water zones
Plants with similar watering needs should be grouped together to make it easier to water them and to save water.  For more information see the Water Zones webpage.