Not knowing your location, what we have found to be excellent trees that will probably not reach the 20 ft. mark in a while are Black Hills Spruce. They make excellent windbreak trees. Short needles, very dense foliage to the ground level, and heat and cold tolerant. Cons: slower growing. Plant 5-6 ft. trees, wait 3 years and then they will take off pretty good. We average under irrigation at least 8 inches year minimum. Depends on soil type, and moisture.
Virginia Junipers may work well also, or Arborvitae, in shorter form. Techny or Pyrimidal Arborvitae are good. Just be cautious of cold north winds if less than Zone 4, can windburn.

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