If you do a web search for "worldwide planting zones," you will find maps for each continent that illustrate the planting or plant hardiness zones. If planned correctly and climate conditions cooperate, it is possible to have a year round vegetable garden. For climates with extremely cold conditions, some of the growing may have to take place in a hot house or cold frame.

Warm season plants will not tolerate much of a frost, but cool weather plants will tolerate frost conditions and some even thrive at that time. To plan for a year round vegetable garden, it is necessary to know what planting zone you live in. Choose the vegetables you plant according to zone and vegetable preference. They will be ready for planting in the spring, usually from April to June. If you live in an area that has warm, cool and cold seasons, choosing a combination of warm and cool season plants will allow you to have fresh vegetables all the time. Warm weather plants can be started from seeds in January.

Cold weather plants can be started from seeds in July and be ready for planting in August and September.