Data are queried from the NCRFC database late morning each day. Deck footings need to be dug below the frost line. Plantmaps has derived zones indicating the Interactive map of average annual First frost dates for the state of Pennsylvania First Frost Date Maps for Neighboring States and Provinces Related Pennsylvania Maps: There is also the possibility of microclimates in your yard that are zones higher or lower than what the maps say they should be. Text, statistical table, dam cross-section, and ill. on verso. They do not account for average maximum temperatures, for example, and some plants may struggle. Crooked Creek Reservoir, Pennsylvania Crooked Creek Reservoir Shows low-water area, high-water area, "Flowage easement", and adjacent land areas. First and Last Frost Date Charts . Includes location map (inset). The average frost line depth in southern Pennsylvania is 36 inches. Pennsylvania Route 940 (PA 940) is a 43.2-mile-long (69.5 km) Pennsylvania highway located in the sparsely developed Pocono Mountains.It runs from PA 309 in Hazleton east to PA 191 in Paradise Valley.Large segments of PA 940 are located in densely forested areas. When you have eliminated the JavaScript , whatever remains must be an empty page. The frost line in my area is 36 inches, though I've heard from the local builders that it's very hard to get there because of the very rocky soil we have. Make sure the bottoms and sides of the holes are compact and solid before pouring your concrete. These maps are based on the average annual extreme minimum temperatures. In addition, the dates are basically the middle of each month, but frost can arrive anywhere from the beginning to the end of the month. 21 - Apr. Soil temperature profiles provide an indication of frost depth during the winter which can have an impact on spring snowmelt runoff rates. Thus, some of these charts are not that helpful. Use a 4x4 post to compact the soil at the bottom of the hole and then add 6" of gravel for better drainage under the footing. Find local businesses, view maps and get driving directions in Google Maps. You can dig the footings 6" deeper than the frost line. Governments and engineers use these charts in the construction of buildings, bridges and roads. The depth of your frost line varies in different parts of the country so you will need to consult with a local structural engineer or see if you can find your city’s frost line requirements on the Google Machine. Courtesy of: USDA Plant Hardiness Zone Map. This map displays soil temperature data from sensors at depths of 2, 4, 8, 20, and 40 inches. Enable JavaScript to see Google Maps. You may live in a city, town, village, county or state that requires all structures be built to the frost line. Zone 11 Apr. "April 1959." In cold climates, including Pennsylvania, a foundation must take into account the impact of frost penetration in order to function properly. A frost line depth chart is a map or graphical representation that indicates the depth at which water in the ground freezes, or the depth to which ice or frost penetrates the soil in a location. Neither of these projects would require an inspection or permit. The base of the founda-tion must extend below the regionally specific frost depth in order to prevent the earth below the founda-tion from heaving. The frost line (also referred to as frost depth or freezing depth) is the average … Heaving occurs when moisture pres- Although the PHZM has updated its zone map, the frost date charts currently do not reflect the new zone subsets. 30: Zone 12 May 1 - May 10: Zone 13 May 11 - May 20: Zone 14 May 21 - May 31

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