If you're concerned about them eating your baitfish all winter long, then an early spring stocking would be fine. Using rainbow trout would also be a better option as brown trout are far more piscavorous than rainbows. What size bass do you have in the pond? Unless you have some real bruisers, you're going to want to stock smaller rainbows, say 8" or less... At that size, the rainbows really aren't piscavorous.
