For the date of 21 MAR 2011, NOAA says...

                NATIONAL TEMPERATURE EXTREMES

                HIGH MON...95 AT PECOS TX

                LOW MON...5 AT PRESQUE ISLE ME

Quite a spread there. It was a high of 46 degrees F in the sagebrush of northern Nevada. Cold and ugly.

Folks must be able to start a garden somewhere in the US, but not here.