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Frost Probability and Growing Season Summary <br /> Length of"Frost Free" <br /> Springy Frost Probability Fall Frost Probability Season(days) <br /> 90% 50% 10% 10% 50% 90% 90% 50% 10% <br /> Buena Vista 320 threshold May 20 June 2 June 12 Sept 3 Sept 19 Sept 27 90 109 120 <br /> 28°threshold May 2 May 13 May 31 Sept 10 Sept 29 Oct 11 109 132 150 <br /> 24'threshold April 17 April 30 May 13 Sept 4 Oct 9 Oct 24 134 160 177 <br /> Salida 32'threshold May 14 May 29 June 15 Aug 30 Sept 14 Sept 29 87 109 127 <br /> 28'threshold May 1 May 14 May 28 Sept 13 Sept 29 Oct 9 118 134 146 <br /> 241 threshold April 16 May 5 May 21 Sept 25 Oct 8 Oct 30 140 156 176 <br /> Prepared by David Whiting Extension Consumer Horticulture Specialist(retired), Department of Horticulture and LA, Colorado State University <br /> Source: Colorado Climate Center at www.wrcc.dri.edu/summary/climsmco.htmi <br /> o CMG GardenNotes are available online at www.cmq.colostate.edu. <br /> o Colorado Master Gardener training is made possible,in part,by a grant from the Colorado Garden Show,Inc. <br /> o Colorado State University,U.S.Department of Agriculture and Colorado counties cooperating. <br /> o CSU Extension programs are available to all without discrimination. <br /> o Copyright 2002-2018.Colorado State University Extension. CMG GardenNotes may be reproduced,without changes or additions, <br /> for nonprofit educational use. <br /> Revised April 2008 <br /> 752-2 <br />