Change in the present net value of the timber resource as a result of a wildfire is a primary input into the determination of economically efficient fire management programs. A procedure was developed to estimate the change in present net value of timber outputs, termed here "net value change." The timber net value change was then estimated for a large number of hypothetical fire situations in the northern Rocky Mountains to determine how fire situation characteristics affect net value change. Each hypothetical fire situation was described by eight variables: timber management emphasis or objective, cover type, stand size, productivity class, slope class, roading, percent mortality, and fire size. The mean net value change for poletimber stands was greater ($289 per acre burned) than the net value change for seedling and sapling ($148 per acre burned) or sawtimber stands ($133 per acre burned). The timber net value change varied considerably about these means, however, depending on the value of the variables that describe the fire situation. Forest Sci. 32:707-724.