An experiment on bearing trees of nectarine cultivar May Fire raised on wild peach seedling rootstocks was undertaken at the experimental orchard of Horticulture Research Station, Kandaghat, District Solan and Farmer's orchard at Kotla-Barog in District Sirmour during the years 2014 and 2015, to investigate the influence of locations on the efficacy of different fruit thinning chemicals. Experimental trees were subjected to nine different treatments viz., NAA at 40 ppm and 60 ppm; Ethrel at 200 and 300 ppm applied one and two week after petal fall and control with three replications in Randomized Block Design. The thinning percentage, shoot growth, tree height and spread, leaf area, leaf to fruit ratio, photosynthetic rate, chlorophyll content and yield of “A” and “B” grade fruit were higher and fruit drop lower in trees treated with NAA 40 ppm, two week after petal fall at both the location and in both the year, Howerver, this treatment was more effective at Kandaghat, in respect of all these parameters. The induction of fruit abscission was higher during 2014 compared to 2015. In the study, vegetative growth, leaf area, leaf to fruit ratio, photosynthetic rate and chlorophyll content were noted significantly lower and production of “C” grade fruit higher in control.