Abstarct: Abstract The impact of a drop on a fluid substrate is one of the fascinating phenomena in fluid mechanics, attracting the attention of many researchers due to its wide applications in processes across industries such as inkjet printing, paint spraying, coating, and spray cooling. The phenomenon of impact in viscoelastic fluids involves complex behaviors due to the emergence of nonlinear and elastic responses, which necessitates further studies in this area. In the present experimental study, a mixture of water, glycerin, and polyacrylamide polymer powder was used to create a Boger fluid, and a mixture of water and glycerin was used to create an equivalent Newtonian solution. The fluids were released as drops by injecting them from a syringe vertically, allowing them to fall onto a pool of stationary fluid. The impact was recorded using a high-speed camera, and the captured images were analyzed using image processing codes. The study then focused on investigating the effect of the elastic properties of the fluid, dimensionless parameters, and various fluid laxyer thicknesses on the formation and growth of the crown. The results of this study indicate that increasing the thickness of the Boger fluid substrate and its Newtonian equivalent up to a critical thickness leads to an increase in the crown growth resulting from the droplet impact on the fluid substrate. However, beyond the critical thickness, this trend reverses, and increasing the fluid substrate thickness leads to a decrease in crown growth. This reduction in crown growth continues until the threshold thickness at which the impact transitions from a film to a fluid pool. Moreover, with a decrease in the droplet size, the changes in crown growth due to increased substrate thickness are reduced. An increase in the dimensionless Weber number plays a significant role in determining the threshold for fluid pooling. Additionally, the effect of droplet impact velocity on different fluid substrate thicknesses is presented for both Boger and equivalent Newtonian fluids. On the other hand, at low fluid substrate thicknesses, the use of Boger fluid instead of its Newtonian equivalent results in increased crown growth. However, at high thicknesses, due to the influence of extensional viscosity, the crown growth in Boger fluid is less than that of its Newtonian equivalent.