Cool climate growing

To grow Tomatoes outside in cooler climates, you have to use one of the fastest maturing and cold hardy varieties, such as the Sub-Arctics or Siberians (which may mean sacrificing some flavor). Start them inside early, warm the soil with plastic and cover the transplants with cloches.

Cuttings

You can get extra Tomato plants by rooting suckers in water. This is a good way to multiply a single special plant you might have.

Early crops

This is pretty much the same as cold climate growing. Use an early, fast maturing variety, give it an early start inside, warm the soil with plastic and cover the transplants with cloches (or put a Tomato cage in place and wrap it with plastic).

Greenhouse

Tomatoes are a great greenhouse crop and in cooler climates this may be the only way you can grow them. They can be grown inside from early spring until later fall. In Europe there are varieties bred specifically for greenhouse growing.