The Himalayan forests particularly, Garhwal Himalayas being the youngest mountain ranges are the most vulnerable stretches of the world susceptible to forest fires. Soils are alive with biological organisms which respond directly to variations in the environment and modify environment physically and chemically. Biological properties of soil are most sensitive to soil heating, with fatal temperatures for most living organisms occurring below 100 0C. In recent years extended droughts and the demand for conversion of forest to other land uses has resulted in significant increase in wildfire size, frequency and related environment impacts. In this study the impact of forest fire was assessed on the insect diversity in sal forest of Lachhiwala for burned and unburned (control) site in four different season, viz. monsoon, winter, spring and summer. A total of 805 individuals of arthropods were grouped into 14 orders and 25 families collected during the entire sampling period. Of all sampled data, a total of 239 individuals were observed in burned and 566 individuals in control site representing 10 orders and 17 families in burned against 13 orders and 24 families in control site.