This paper discusses the development and implementation of a cost-effective Wireless Sensor Network (WSN) optimized for long-term agricultural monitoring within the Internet of Things (IoT) communication technology domain. Addressing key application requirements such as affordability, scalability, rapid deployment, longevity, and minimal maintenance, our proposed WSN utilizes a mesh network architecture to ensure extensive coverage and resilience against geographical and infrastructural challenges. The design leverages double-sided, surface-mounted components on a single side of the PCB, significantly reducing production costs while enhancing durability for operation in diverse and harsh agricultural environments. The nodes are encased in custom-designed, economical plastic cases and incorporate an efficient power management strategy, maximizing the network’s operational life. Implemented using KiCad EDA software and manufactured by JLCPCB with a four-layer stackup, the detailed design measures 85.26 mm by 30.10 mm.