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In warmer parts of the country, the frost depth may be less than one foot. One researcher found that the deepest part of the permafrost underneath Prudhoe Bay, Alaska, is more than 500,000 years old. Science Program This diagram shows how the Earths atmosphere and the ground reflects and absorbs the Suns energy. This transfer of heat between the ground and the air is called the surface energy flux. It can move the footings, foundations, and pipelines in the ground. The result is a chaotic movement of hardened earth that has enough force to bend posts, break rock, and shift entire building foundations. All rights reserved. However, when all is said and done, setting your posts at least 2 feet underground is a safe bet. The water solution becomes colorless when it is frozen. More Info/ Outages Once the bottom of a footing is buried below the frost line, the residual heat in the ground below the footing will ensure the soil below the footing will not freeze in the winter. In the winter, the ground freezes from the top of the soil downward. One of the best ways to prevent frost heave in fence posts is to dig the hole deeper than the frost line in your area. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This can be detrimental to the level of any posts or footings. The frost line is the depth at which moisture will freeze in the ground. Credit: NASA Atmospheric Science Data Center. Additionally, they could roll up the sod and reuse it, saving $100 per grave. This map displays recent frost depth measurements in terms of inches below the soil surface. The line varies by latitude, it is deeper closer to the poles. Building a deck is a popular DIY project, but things quickly go wrong when the frost depth isnt accounted for. Submit Your Weather Report Is there a limit to safe downhill speed on a bike, Compatibility for a new cassette and chain. Your blankets are absolutely excellent. In SW Michigan, for example, this says 3 feet, whereas other sources give 4+ feet.