From the "Dig In" blog at the Milwaukee Journal Sentinel:

"Storm window magic: Nurturing spinach"

Within the next few weeks, while others are still dreaming of tender spinach from their own gardens, Annie Wegner LeFort of Bay View will reach through the window of a wooden contraption in her backyard.

And voila! She will pick her own garden spinach, fresh from the cold frame, to toss into her first homegrown salad of the season.

The pastry chef for Sheridan’s Cafe in Cudahy planted spinach in a raised bed around the end of last September, and gave it cold weather protection with an inexpensive contraption made from recycled odds and ends, known as a cold frame. [...]