Bihar and Jharkhand are the most important states in Eastern India in terms of rice production. It is essential to study the growth pattern of rice production in these states. Therefore the present study was conducted to examine the growth rate and instability in area, production and yield of rice in Bihar including Jharkhand state. The data was collected for the period 1980-81 to 2019-20 and divided into five periods for analysis. Compound annual growth rate and Cuddy-Della Valle Instability index have been computed for the five periods. The new approach has been proposed for classification of instability values under five classes. Highest growth rate for area and production was observed in Hazaribag district during period IV and for yield it was recorded in Begusarai district during the same period. During period I and II most of the districts recorded positive growth rate for production and yield. The instability varies from 2.76 to 99.62 percent for area, 13.24 to 119.98 percent for production and 9.34 to 173.28 percent for yield across the districts during five periods. For production and yield, most of the districts recorded medium instability during period I and period II; and high instability during period III, period IV and period V.