<p><span style="font-size:14px"><span style="font-family:Arial,Helvetica,sans-serif">The present study was carried out during 2014-15 in the Kullu district of Himachal Pradesh, which is situated between 31&ordm;52&rsquo;00&rdquo; to 31&ordm;58&rsquo;00&rdquo; North latitude and 76&ordm;13&rsquo;00&rdquo; to 77&ordm;44&rsquo;00&rdquo; East longitudes.The cumulative chill units hours available for apple crop were calculated by using UTAH model for the period of 1986 to 2015 and a decrease of 6.38 chill units(CU) hours per year was recorded at Kullu Valley of Himachal Pradesh. Chill units for the last three decades i.e. 1986-1995, 1996-2005 and 2006-2015 also revealed a decreasing trend of the order of 63.79 CU decreased per decade.Monthly accumulation of chill unit hours during the same period for each winter month&nbsp; (November, December, January and February) revealed maximum decrease of &nbsp;2.186 CU per year was observed for the month of February. Trend analysis of last five years 2011-2015 showed there was a huge decrease of 14.98 chill units per year. Data on apple productivity in Kullu district for last decade (2005-2014) showed a decreasing trend of the order of 0.183 tons/ha /year as per the regression equation y = -0.183x + 5.745. Thus the climatic conditions for apple cultivation in the Kullu district will be becoming unfavorable in the coming years.</span></span></p>