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A Prudent Cognitive Multicast Protocol (PCMP) is introduced to employ the multicast routing services for Cognitive Radio Networks (CRNs). The channel allocation and route establishment are performed simultaneously by considering the Primary Users (PUs) activity. In the multicast route establishment phase, the protocol establishes a concrete multicast tree with optimum channel utilization to ensure a stable path. The channel diversity of route selection and endways delay of packet delivery is balanced by Weighted Accumulative Expected Transmission Time (WAETT). The Secondary Users (SUs) used in the network share the channel availability information between them. With the help of this shared information, a route recovery is also performed during the sudden emerging of PUs in the CRN environment. The Novel PCMP protocol is implemented using Network Simulator 2 (NS2) and its performance is accessed in terms of the packet delivery ratio and end-to-end delay. The existing methods such as Genetic Algorithm (GA) optimized Fuzzy Decision System (FDS), Stability-based Multipath Quality of Service (QoS) Routing Protocol (SMQRP) and Optimal Relay and Channel Selection (ORCS) are used to evaluate the PCMP. The PDR of the PCMP is 0.9975 for 100 nodes, it is high when compared to the GA-FDS, SMQRP and ORCS.