The way I look at it is anyone can stock fish in warmer months. The real challenge is to get it done in 20 F or less. That's when you can say you've really accomplished something.

Really though, I would wait until late March or April. The highest survival rates will be when the least water temperature deltas or gradients happen.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."