Despite the short growing season, summer days in the upper Midwest are very long. The sun sets after 10 pm from the end of June through July.
Topics relate to cold-zone gardens in these extreme climates:
Zone 3
A Zone 3 garden is located in a region with extremely cold winters, with average minimum temperatures between -40°F and -30°F, and a very short growing season.
Zone 4
A Zone 4 garden is located in a region with minimum temperatures of -20°F to -30°F and a relatively short growing season from roughly May to September.
