An adjustable clamp for mounting an auxiliary tool onto a loader bucket is provided. The adjustable clamp includes a first clamping member possessing a first clamping surface and a second clamping member possessing a second clamping surface. The second clamping member is slidably connected to the first clamping member such that the second clamping surface is movable along an angled path toward the first clamping surface to clamp the loader bucket between the first and second clamping surfaces. Also provided is a snow plow assembly including a snow plow and an adjustable clamp. A method of mounting a snow plow onto a loader bucket by way of an adjustable clamp is also provided.