This apply to USDA Climate Zone 3a and zone 3b. In these zones the minimum temperatures are -40 to -35 degrees F (-40 to -37.2 degrees C) and -35 to -30 degrees F (-37.2 to -34.4 degrees C) respectively.
What plants are Cold Hardy to USDA Zone 3? What Plants Can Grow in Zone 3?
Fruit Trees that grow in zone 3:
Arctic Beauty Kiwifruit
Beta Grape
Black walnut (Juglans nigra)
Bluebell Grape
Butternut (Juglans cinereal)
Dolgo crabapple
Westcot apricot
Vegetables that grow in zone 3:
Asparagus
Beans
Broccoli
Carrots
Celery
Chili pepper
Cucumber
Onions
Potato
Tomatoes
Summer squash
Winter squash
Flowers and Ornamentals that grow in zone 3:
Alpine Rockcress
Aster
Blanket Flower
Glory of the snow
Salvia
Snow-in-Summer
Virginia Bluebells
Wallflower
Yellowhorn tree (Xanthoceras sorbifolium)
Youngstown juniper
Evergreen Picea glauca Conica Dwarf Alberta Spruce
Roses (look below)
Cold Hardy Roses that grow in zone 3:
Rosa acicularis (Arctic Rose)
Rosa Prairie Joy (Buck Rose)
Rosa rubrifolia
Rugosa Variants: Rosa rugosa/Rosa Hansa/Rosa scabrosa
Rosa rugosa Alba
Rosa woodsii and Rosa woodsii Kimberley
Herbs that grow in zone 3:
Basil
Caraway
Catnip
English chamomile
French sorrel
Garlic
Horseradish
Parsley
Peppermint