USA Hardiness Zone 3a

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NOTE: No Planting in Winter Months.

USA Zone 3a

Extreme Minimum Temperate −40.0 to −37.2°C (−40 to −35°F)

Continental Subarctic and Alpine Climates - Short Mild Humid Summers and Extremely Cold winters

Indicative Towns: International Falls, Minnesota; St. Michael, Alaska

Zone 3a areas typically have a humid continental climate (Köppen: Dfb), with long, extremely cold winters and humid warm summers

Plant hardiness Zone 3 (a & a) is found throughout Alaska, and in high altitude areas in northern United States. Zone 3 (a & a) features minimum average temperatures of -40 to -30 degrees F. Depending on your location growing conditions can also be affected by high winds, extreme cold and low rainfall in summer.

Zone 3 (a & b) has a very short growing season for growing vegetables and herbs. The last frost date is around the middle of May. The first frost date is generally in mid-September. Adding row covers can help extend the growing season and warm the ground. Plant vegetables that germinate and mature quickly to beat early frosts. In addition to Zone 2 plants, vegetables to plant in summer include: Cucumbers, Summer squash, Asparagus, Winter squash and Celery. Some additional herbs to plant include: English chamomile, French sorrel, Caraway, Catnip, Horseradish, Peppermint, Parsley and Garlic.

Towns Include:
International Falls, Minnesota
Roseau, Minnesota



Disclaimer: The PlantWhatWhen vegetable planting guide is only designed for use as a very general reference for home gardening purposes. It is not to be used for farming, markets or commercial activities of any kind whatsoever. We take absolutely no responsibility for the accuracy and adequacy of the information provided on this site. We recommend that you consider your local climate, weather patterns and conditions when deciding what and when to plant in your home garden. It's entirely your own decision. Happy Gardening and Best Wishes!