Sacrificing to Jack Frost

I remember a great line from the mentor that taught my Master Gardners class, "every spring my wife does her yearly tomato plant sacrifice to Jack Frost."
We all get spring fever and want to get our gardens going but don't be tempted by the 70+ degree weather just yet.
The old timers in the area always used Squaw Butte (Big lone peak with no trees to the North) as a gauge - never plant until ALL the snow is off the Butte. It's worked for me for years.